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Artykuły w czasopismach na temat „Hexane Substitution”

Autor: Grafiati

Data publikacji: 31 sierpnia 2024

Data aktualizacji: 31 lipca 2025

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1

Silva, Gabriel Julio da, Julcelly Dayara de Oliveira Henriques, and Patricia Fazzio Martins Martinez. "Sugarcane wax extraction using hexane and limonene mixtures." Revista Engenharia na Agricultura - REVENG 30 (February 21, 2022): 13–18. http://dx.doi.org/10.13083/reveng.v30i1.13241.

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Hexane is the most widely solvent used in the lipids extraction process, as the case of the sugarcane wax. However, the use of this solvent is highly harmful to the environment and to human health. Limonene is a monoterpene found in the citrus peel, with great potential for use as a green solvent. In this study, the partial and total substitution of hexane by limonene was performed in the process of the sugarcane peel wax extraction to evaluate the effect of this substitution on the physicochemical characteristics of the wax. The extracted samples were compared with a commercial wax sample (ca

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2

Cravotto, Christian, Anne-Sylvie Fabiano-Tixier, Ombéline Claux, et al. "Towards Substitution of Hexane as Extraction Solvent of Food Products and Ingredients with No Regrets." Foods 11, no. 21 (2022): 3412. http://dx.doi.org/10.3390/foods11213412.

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Hexane is a solvent used extensively in the food industry for the extraction of various products such as vegetable oils, fats, flavours, fragrances, colour additives or other bioactive ingredients. As it is classified as a “processing aid”, it does not have to be declared on the label under current legislation. Therefore, although traces of hexane may be found in final products, especially in processed products, its presence is not known to consumers. However, hexane, and in particular the n-hexane isomer, has been shown to be neurotoxic to humans and has even been listed as a cause of occupat

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3

Rapinel, Vincent, Aziadé Chemat, Cyrille Santerre, et al. "2-Methyloxolane as a Bio-Based Solvent for Green Extraction of Aromas from Hops (Humulus lupulus L.)." Molecules 25, no. 7 (2020): 1727. http://dx.doi.org/10.3390/molecules25071727.

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The potential of using the bio-based solvent 2-methyloxolane, also known as 2-methyltetrahydrofuran or 2-MeTHF, as an alternative to petroleum solvents such as hexane, was investigated for the extraction of volatile compounds from hop cones (Humulus lupulus L.). Lab scale extractions were coupled with in silico prediction of solutes solubility to assess the technical potential of this bio-based solvent. The predictive approach was performed using the simulation software COSMO-RS (conductor like screening model for real solvants) and showed that the 2-methyloxolane is as good as or better than

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4

Walton, John C. "Radical rearrangements of bicyclo[2.2.0]hexane: homolytic substitution of a cyclobutane ring." Journal of the Chemical Society, Chemical Communications, no. 16 (1987): 1252. http://dx.doi.org/10.1039/c39870001252.

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Keglevich, György, Attila Kovács, László Tőke, et al. "P-Substituted 3-phosphabicyclo [3.1.0] hexane 3-oxides from diastereoselective substitution at phosphorus." Heteroatom Chemistry 4, no. 4 (1993): 329–35. http://dx.doi.org/10.1002/hc.520040405.

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6

Gardecka, A. J., G. K. L. Goh, G. Sankar, and I. P. Parkin. "On the nature of niobium substitution in niobium doped titania thin films by AACVD and its impact on electrical and optical properties." Journal of Materials Chemistry A 3, no. 34 (2015): 17755–62. http://dx.doi.org/10.1039/c5ta03772g.

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7

Hung, Nguyen Khanh, Nguyen Tuan Thanh, Nguyen Thi Thuy Luyen, and Nguyen Huy Du. "Evaluating the enantioselective capability of a cellulose tris(3,5‐dimethylphenyl carbamate)‐based stationary phase towards 5,7,2'‐trihydroxyflavanone." Vietnam Journal of Chemistry 61, S2 (2023): 149–54. http://dx.doi.org/10.1002/vjch.202300193.

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AbstractIn this study, an evaluation of the enantioselective of a chiral flavanone with 2'‐OH substitution (5,7,2'‐trihydroxyflavanone) on ring C was studied by high performance liquid chromatography using the cellulose tris(3,5‐dimethylphenyl carbamate)‐based stationary phase with n‐hexane and iso‐propanol doped with 0.1% (v/v) trifluoroacetic acid as a mobile phase. Column temperature and mobile phase composition were investigated in the assessment of the chiral separation by considering the enantiomeric resolution factor (Rs). Also, the absolute configurations of single enantiomers were det

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8

Shahin, Nabil, Nawaf Abu-Khalaf, Mazen Salman, and Harun Parlar. "Testing the Possibility of Photochemical Synthesis of Chlorinated Phenols, Benzenes and Biphenyl: Pre-study Guide for Standards Synthesis." مجلة جامعة فلسطين التقنية للأبحاث 4, no. 2 (2016): 73–83. http://dx.doi.org/10.53671/pturj.v4i2.47.

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Since deuterium 2H (D) is an isotope of hydrogen 1H, the testing of the possibility of photochemical synthesis of marked chlorinated phenol, biphenyl and benzene using normal solvents was studied. The irradiation of full chlorinated compounds dissolved in normal solvents such as MeOH or n-hexane has led to a reaction substitution in which a chlorine atom was substituted by hydrogen atom forming less grade chlorinated chlorophenols, biphenyls and benzenes. The quantum yields of pentachlorophenol, decachlorobiphenyl and hexachlorobenzene under irradiation using polychromatic light were calculate

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9

Shahin, Nabil, Nawaf Abu-Khalaf, Mazen Salman, and Harun Parlar. "Testing the Possibility of Photochemical Synthesis of Chlorinated Phenols, Benzenes and Biphenyl: Pre-study Guide for Standards Synthesis." مجلة جامعة فلسطين التقنية خضوري للأبحاث 4, no. 2 (2016): 73–83. http://dx.doi.org/10.53671/ptukrj.v4i2.47.

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Since deuterium 2H (D) is an isotope of hydrogen 1H, the testing of the possibility of photochemical synthesis of marked chlorinated phenol, biphenyl and benzene using normal solvents was studied. The irradiation of full chlorinated compounds dissolved in normal solvents such as MeOH or n-hexane has led to a reaction substitution in which a chlorine atom was substituted by hydrogen atom forming less grade chlorinated chlorophenols, biphenyls and benzenes. The quantum yields of pentachlorophenol, decachlorobiphenyl and hexachlorobenzene under irradiation using polychromatic light were calculate

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10

Fischer, Malte, Marc Schmidtmann та Rüdiger Beckhaus. "Crystal structure of the formal 20 electron zirconocene pentafulvene complex Cp2Zr(η5,η1-adamantylidenepentafulvene):toluene:n-hexane = 1:0.125:0.125". Acta Crystallographica Section E Crystallographic Communications 73, № 12 (2017): 1823–26. http://dx.doi.org/10.1107/s2056989017015560.

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The crystal structure of a solvated zirconocene pentafulvene complex with a bulky adamantylidene substitution pattern, namely (η5,η1-adamantylidenepentafulvene)bis(η5-cyclopentadienyl)zirconium(IV)–toluene–n-hexane (8/1/1), [Zr(C15H18)(C5H5)2]·0.125C7H8·0.125C6H14, is reported. Reducing zirconocene dichloride with magnesium results in the formation of a low-valent zirconocene reagent that reacts readily with adamantylidenepentafulvene to give the aforementioned complex. Single crystal X-ray diffraction proves the dianion-like η5:η1binding mode of the fulvene ligand to the central ZrIVatom. The

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11

Maha F. Abbass, Salah Al-Shukri, and Ahmed A. Ahmed. "Selective mono substitution of cyclotri-phosphazene by 2-Hydroxyethylacrylate producing new acrylate cyclo-triphosphazene." GSC Advanced Research and Reviews 10, no. 3 (2022): 080–87. http://dx.doi.org/10.30574/gscarr.2022.10.3.0070.

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In this work, new acrylate cyclotriphosphazene moiety (PN-A) was successfully synthesized starting from cyclotriphosphazene (PN) compound. This compound reacted with 2-hydroxyethylacrylate utilizing 1:1 mole ratio to increase the priority of one substitution reaction and forming PN-A molecule. The crud product was purified by recrystallization using n-hexane and column chromatography using cyclohexane: ethyl acetate 60:40 mL ratio as eluent. The obtained pure target product was characterized using FTIR, 1H NMR, 13C NMR, and 31P NMR techniques. All spectra demonstrates the chemical structure of

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12

Engering, Josef, Eva-Maria Peters, and Martin Jansen. "Dimeres Di(N-lithium–tert–butylamino)bis(dimethylamino)silan - [Si(N(CH3)2)2(NLiC(CH3)3)2]2 – Darstellung und Kristallstruktur / Dimeric Di(N -lithio-tert-butylamino)bis(dimethylamino)silane - [Si(N(CH3)2)2(NLiC(CH3)3)2]2 – Synthesis und Crystal Structure." Zeitschrift für Naturforschung B 56, no. 1 (2001): 90–94. http://dx.doi.org/10.1515/znb-2001-0115.

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Abstract [Si(N(CH3)2)2(NLiC(CH3)3)2]2 results from the reaction of silicon tetrachloride with excess terf-butylamine, followed by halogen substitution with LiN(CH3)2, and treatment with n-butyllithium in hexane. The title compound, found to be dimeric in the solid state, was characterised by single crystal X-ray diffraction (triclinic, Pi , a = 10.208(2), b = 12.140(2), c = 15.658(3) Å , a = 79.02(3), ß = 82.80(3), γ = 67.19(3)°, Z = 2, C24H60Li4N8Si2 ), and by solid state and solution NMR-spectroscopy and mass spectrometry.

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13

KEGLEVICH, G., A. KOVACS, L. TOEKE, et al. "ChemInform Abstract: P-Substituted 3-Phosphabicyclo(3.1.0)hexane 3-Oxides from Diastereoselective Substitution at Phosphorus." ChemInform 25, no. 2 (2010): no. http://dx.doi.org/10.1002/chin.199402219.

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Maha, F. Abbass, Al-Shukri Salah, and A. Ahmed Ahmed. "Selective mono substitution of cyclotri-phosphazene by 2-Hydroxyethylacrylate producing new acrylate cyclo-triphosphazene." GSC Advanced Research and Reviews 10, no. 3 (2022): 080–87. https://doi.org/10.5281/zenodo.6401215.

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In this work, new acrylate cyclotriphosphazene moiety (PN-A) was successfully synthesized starting from cyclotriphosphazene (PN) compound. This compound reacted with 2-hydroxyethylacrylate utilizing 1:1 mole ratio to increase the priority of one substitution reaction and forming PN-A molecule. The crud product was purified by recrystallization using n-hexane and column chromatography using cyclohexane: ethyl acetate 60:40 mL ratio as eluent. The obtained pure target product was characterized using FTIR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, and <sup>31</sup>P NMR techniques. Al

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15

Istyami, Astri Nur, Tatang Hernas Soerawidjaja, Tirto Prakoso, and Tri Ari Penia Kresnowati. "Performance of Various Organic Solvents as Reaction Media in Plant Oil Lipolysis with Plant Lipase." Reaktor 18, no. 2 (2018): 71. http://dx.doi.org/10.14710/reaktor.18.2.71-75.

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Fatty acids are intermediate substances in synthesis of oleochemical products. Enzymatic technology of fatty acids production (also known as lipolysis) is now developing as potential substitution for the conventional production of fatty acid, i.e. thermal hydrolysis of triglyceride. It offers more economical process condition, low energy consumption, and minimal product degradation compared to the conventional process. This research aims to evaluate performance of various organic solvents as reaction media in lipolysis with plant latex lipase. Organic solvents observed were chloroform, n-hexan

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16

Landers, Gary M., and James A. Olson. "Absence of Isomerization of Retinyl Palmitate, Retinol, and Retinal in Chlorinated and Nonchlorinated Solvents Under Gold Light." Journal of AOAC INTERNATIONAL 69, no. 1 (1986): 50–55. http://dx.doi.org/10.1093/jaoac/69.1.50.

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Abstract Purified solutions of all-trans retinyl palmitate, retinol, and retinaldehyde in chloroform, methylene chloride, or hexane were exposed to white light or gold fluorescent light or were kept in the dark, and the resulting isomer distributions were determined by LC (liquid chromatography). No significant isomerization of any of the retinoids occurred either in the dark or on exposure to gold light in any of the solvents tested. However, a large amount of the 9-cis isomer and only much smaller amounts of other cis isomers were produced when retinol or retinyl palmitate in chloroform or m

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17

Suganuma, Misato, Daichi Kitagawa, Shota Hamatani, and Seiya Kobatake. "Effect of substitution position of aryl groups on the thermal back reactivity of aza-diarylethene photoswitches and prediction by density functional theory." Beilstein Journal of Organic Chemistry 21 (January 31, 2025): 242–52. https://doi.org/10.3762/bjoc.21.16.

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Aza-diarylethene has been developed as a new family of photochromic compounds. This study explores the photochromic properties and thermal back reactivities of various aza-diarylethene regioisomers (N1–N4 and I1–I4) in n-hexane. These molecules exhibit fast thermally reversible photochromic reactions driven by 6π aza-electrocyclization. Kinetic analysis of the thermal back reaction revealed activation parameters, highlighting how the substitution position of the aryl group affects the thermal stability. Additionally, density functional theory calculations identified M06 and MPW1PW91 as the mos

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18

Wloch, J. "Influence of isomorphous substitution in MFI-type materials on the diffusion of n-hexane: Molecular dynamic studies." Applied Surface Science 253, no. 13 (2007): 5692–95. http://dx.doi.org/10.1016/j.apsusc.2006.12.047.

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Zapol’skii, Viktor A., Jan C. Namyslo, Armin de Meijere, and Dieter E. Kaufmann. "Chemistry of polyhalogenated nitrobutadienes, 10: Synthesis of highly functionalized heterocycles with a rigid 6-amino-3-azabicyclo[3.1.0]hexane moiety." Beilstein Journal of Organic Chemistry 8 (April 23, 2012): 621–28. http://dx.doi.org/10.3762/bjoc.8.69.

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The nitropolychlorobutadienes 3, 4 are valuable building blocks for various amination and successive heterocyclization products. Nucleophilic substitution reactions of the partially protected, bioactive amines 1, 2 with either vinyl, imidoyl or carbonyl chlorides result in the formation of the enamines 11, 12, 13, 16, 25, the amidine 6, and the amides 20, 21, respectively. In the following, cyclization to the highly functionalized pyrazoles 27, 28, pyrimidine 26 and pyridopyrimidine 24 succeeded. Deprotection of 21, 12 and 28 proved to be only partially feasible.

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20

Cibian, Mihaela, André Bessette, Andrew O'Connor, Janaina G. Ferreira, and Garry S. Hanan. "Twofac-tricarbonylrhenium(I) azadipyrromethene (ADPM) complexes: ligand-substitution effect on crystal structure." Acta Crystallographica Section C Structural Chemistry 71, no. 2 (2015): 122–27. http://dx.doi.org/10.1107/s2053229614027673.

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The crystal structures offac-(acetonitrile-κN)(2-{[3,5-bis(4-methoxyphenyl)-2H-pyrrol-2-ylidene-κN1]amino}-3,5-bis(4-<!?tlsb=0.2pt>methoxyphenyl)-1H-pyrrol-1-ido-κN1)tricarbonylrhenium(I)–hexane–acetonitrile (2/1/2), [Re(C36H30N3O4)(CH3CN)(CO)3]·0.5C6H14·CH3CN, (2), andfac-(2-{[3,5-bis(4-methoxyphenyl)-2H-pyrrol-2-ylidene-κN1]amino}-3,5-bis(4-methoxyphenyl)-1H-pyrrol-1-ido-κN1)tricarbonyl(dimethyl sulfoxide-κO)rhenium(I), [Re(C36H30N3O4)(C2H6OS)(CO)3], (3), at 150 K are reported. Both complexes display a distorted octahedral geometry, with afac-Re(CO)3arrangement and one azadipyrromethen

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Chiacchiera, Stella M., Joaqu�n O. Singh, Jorge D. Anunziata, and Juana J. Silber. "Aromatic nucleophilic substitution reactions of 1,2-dinitrobenzene with aliphatic primary amines in n-hexane; catalysis by non-nucleophilic bases." Journal of the Chemical Society, Perkin Transactions 2, no. 8 (1987): 987. http://dx.doi.org/10.1039/p29870000987.

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Singh, Joaquín O., Jorge D. Anunziata та Juana J. Silber. "n–π Electron donor–acceptor complexes. II. Aliphatic amines with dinitrobenzenes". Canadian Journal of Chemistry 63, № 4 (1985): 903–7. http://dx.doi.org/10.1139/v85-150.

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The interaction of several aliphatic amines as n-donors and dinitrobenzenes (DNB) as π-acceptors has been studied in n-hexane. The formation of electron donor – acceptor (EDA) complexes is proposed to explain the spectroscopic behaviour of the mixtures. The stability constants (Ks) for these complexes have been calculated by an iterative procedure. For a given acceptor, the donor strength of RNH2 > R2NH > R3N was found. This order is explained by considering the role that steric effect may play in the EDA complex formation. On the other hand, the fact that for a given donor Ks follows th

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Minka, S., and M. Bruneteau. "Isolement et caractérisation chimique des lipopolysaccharides de type R dans une souche hypovirulente de Yersinia pestis." Canadian Journal of Microbiology 44, no. 5 (1998): 477–81. http://dx.doi.org/10.1139/w98-029.

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The lipopolysaccharides LPS I and LPS II, isolated from the hypovirulent EV40 strain of Yersinia pestis, are composed only of type R lipopolysaccharides. This type consists of two forms, a and b, depending on their solubility pattern in a solvent mixture containing varying proportions of chloroform, methanol, hexane, and hydrochloric acid. LPS I consists of one subtype, RIb, while LPS II consists of two subtypes, RIIa and RIIb. Analysis by gel electrophoresis shows that the mass of these lipopolysaccharide forms are in the vicinity of 2000-3000 Da. The RIb and RIIb subtypes, which are found in

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Engering, Josef, Eva-Maria Peters, and Martin Jansen. "Synthesen und Kristallstrukturen von Bis(N-lithiumtrimethylsilylamino)- bis(dimethylamino)silan und 1,1-Dichloro-2,4-bis(trimethylsilylamino)- 3,3-bis(dimethylamino)siladiazatitanacyclobutan / Syntheses and Crystal Structures of Bis(N-lithio-trimethylsilylamino)bis(dimethylamino)- silane and 1,1-Dichloro-2,4-bis(trimethylsilylamino)-3,3-bis(dimethylamino)siladiazatitanacyclobutane." Zeitschrift für Naturforschung B 57, no. 9 (2002): 976–82. http://dx.doi.org/10.1515/znb-2002-0902.

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Bis(N-lithio-trimethylsilylamino)bis(dimethylamino)silane (1) is formed in the reaction of silicon tetrachloride with excess hexamethyldisilazane, followed by halogen substitution using two equivalents of LiN(CH3)2, and treatment with two equivalents of n-butyllithium in hexane. 1, found to be dimeric in the solid state, was characterised by single crystal X-ray diffraction (monoclinic, C2/c, a = 1925.2(4), b = 1501.7(2), c = 1389.7(3) pm, β= 101.98(2), Z = 4, C20H60Li4N8Si6), and by solid state and solution NMR spectroscopy and mass spectrometry. Further reaction with titanium tetrachloride (

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Ollivier, Jean, Frédéric Lecornué та Florence Charnay-Pouget. "π-Allyl Palladium Complexes as Efficient and Powerful Alternative for Nucleophilic Substitution on Bicyclo[3.1.0]hexane Sulfonates: Regio-, Chemo- and Stereoselectivity". Synlett 2006, № 9 (2006): 1407–9. http://dx.doi.org/10.1055/s-2006-939716.

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Leigh, William J., Andrey G. Moiseev, Eugenie Coulais, Farahnaz Lollmahomed, and Mohammad S. Askari. "Substituent effects on silene reactivity — Reactive silenes from photolysis of phenylated tri- and tetrasilanes." Canadian Journal of Chemistry 86, no. 12 (2008): 1105–17. http://dx.doi.org/10.1139/v08-165.

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Laser flash photolysis of 2-phenylheptamethyltrisilane (5d), 2,2-diphenylhexamethyltrisilane (5e), and phenyltris(trimethylsilyl)silane (5f) in hexane and acetonitrile solution affords strong, long-lived transient absorptions centered in the 440–470 nm range, which are assigned to the transient silenes formed via [1,3]-trimethylsilyl migration into the ortho-position of a phenyl ring on the basis of their UV–vis spectra and kinetic data for their reactions with methanol (MeOH), acetic acid (AcOH), acetone, 2,3-dimethyl-1,3-butadiene (DMB), carbon tetrachloride (CCl4), and oxygen. The silene de

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Budiarti, Mery, Anshary Maruzy, Nengah Ratri RK, and Endang Brotojoyo. "Aktivitas Antimalaria Daun Gempol (Nauclea orientalis (L.) L) terhadap Plasmodium falciparum." Media Penelitian dan Pengembangan Kesehatan 30, no. 2 (2020): 135–46. http://dx.doi.org/10.22435/mpk.v30i2.3044.

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Abstract  The use of gempol (Nauclea orientalis (L.) L) stem as a malaria medicine has been empirically and scientifically proven. This condition encourages exploitation which can lead to scarcity of raw materials. Substitution of plant parts as raw material for medicine is one of the innovations that can be done for the sustainability of the plant species. Leaves are one part of the plant that is often used as a raw material for medicine. The selection of leaves as the main ingredient has many advantages over other parts. Until now, research related to the antimalarial bioactive potenti

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Naddeo, Simone, Vincenzina Barbera, and Maurizio Galimberti. "Sulphur Copolymers with Pyrrole Compounds as Crosslinking Agents of Elastomer Composites for High-Performance Tyres." Polymers 16, no. 19 (2024): 2802. http://dx.doi.org/10.3390/polym16192802.

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Driving a car at extreme speeds, road holding, and sustainability do not go together well. Formula 1 racing is exciting but is not an example of sustainability. The aim of this work was to use materials, suitable for the treads of high-performance racing tyres, that can favour both high performance and sustainability. In particular, the objective was to achieve high dynamic rigidity at high temperatures (>100 °C) and a stable crosslinking network. A copolymer from an industrial waste such as sulphur and a comonomer from a circular biosourced material were used as the crosslinking agent of a

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Ido, Atsushi, Atsushi Hashizume, Takashi Ohta, Takayuki Takahashi, Chiemi Miura, and Takeshi Miura. "Replacement of Fish Meal by Defatted Yellow Mealworm (Tenebrio molitor) Larvae in Diet Improves Growth Performance and Disease Resistance in Red Seabream (Pargus major)." Animals 9, no. 3 (2019): 100. http://dx.doi.org/10.3390/ani9030100.

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Yellow mealworm (Tenebrio molitor) larvae are a potential alternative animal protein source for sustainable aquaculture. However, reports on the successful complete substitution of fish meal with yellow mealworm larvae in an aquaculture diet have been limited. In this study, we conducted a feeding trial with red seabream (Pagrus major) being fed diets with partial or complete replacement of fish meal with yellow mealworm larvae defatted with a hexane–ethanol solution. Feed intake in red seabream increased in accordance with yellow mealworm larvae inclusion, and diets including 65% defatted mea

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Marliyana, Surya Dewi, Sayekti Wahyuningsih, and Nisa Nur Hayati. "Synthesis of Cardanol-Based Acetaldehyde Novolac Resin from Cashew Nut Shell Liquid (CNSL)." Jurnal Kimia Sains dan Aplikasi 25, no. 9 (2022): 316–21. http://dx.doi.org/10.14710/jksa.25.9.316-321.

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Polymers are currently in the limelight. Phenolic resin is one of the polymer products obtained from the polymerization process, either from natural or synthetic sources. One of the natural compounds that can be applied to polymers is cardanol. This study aimed to synthesize cardanol-based acetaldehyde novolac resin from Cashew Nut Shell Liquid (CNSL). Isolation of cardanol from CNSL was done by liquid-liquid extraction method with acetone and purified by gravity column chromatography in a mixture of n-hexane and ethyl acetate in a ratio of 9:1. HPLC analysis showed that cardanol compounds had

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Krow, Grant R., Seth B. Herzon, Guoliang Lin, Feng Qiu, and Philip E. Sonnet. "Complex-Induced Proximity Effects. Temperature-Dependent Regiochemical Diversity in Lithiation−Electrophilic Substitution Reactions ofN-BOC-2-Azabicyclo[2.1.1]hexane. 2,4- and 3,5-Methanoprolines." Organic Letters 4, no. 18 (2002): 3151–54. http://dx.doi.org/10.1021/ol026509b.

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Kim, Hak Sung, Michihiro Ohno, Bin Xu, et al. "2-Substitution of Adenine Nucleotide Analogues Containing a Bicyclo[3.1.0]hexane Ring System Locked in a Northern Conformation: Enhanced Potency as P2Y1Receptor Antagonists." Journal of Medicinal Chemistry 46, no. 23 (2003): 4974–87. http://dx.doi.org/10.1021/jm030127+.

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KEGLEVICH, G., L. TOEKE, A. KOVACS, et al. "ChemInform Abstract: Ring Transformation of Phosphorus Containing Heterocycles. Part 12. P- Substituted 3-Phosphabicyclo(3.1.0)hexane 3-Oxides from Diastereoselective Substitution at Phosphorus." ChemInform 25, no. 52 (2010): no. http://dx.doi.org/10.1002/chin.199452204.

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Taidakov, I. V., M. T. Metlin, D. A. Metlina, V. E. Goncharenko, and T. S. Vlasova. "Neutral Terbium(III) Tris(complex) with 4,4,5,5,6,6,6-Heptafluoro-1-(1-methyl-1H-pyrazol-4-yl)hexane-1,3-dione: Synthesis, Structure, and Spectral Luminescence Properties." Koordinacionnaâ himiâ 50, no. 9 (2024): 592–603. https://doi.org/10.31857/s0132344x24090064.

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The reaction of 1,3-diketone containing 1-methyl-1H-pyrazol-4-yl and perfluoropropyl fragments with TbCl3·6H2O in the presence of NaOH in ethanol is studied. The molecular and crystal structures of the complex are studied by single-crystal X-ray diffraction (XRD). Compound [Tb(L)3(EtOH)2] crystallizes in the triclinic crystal system with the space group. The geometry of the coordination polyhedron {LnO8} corresponds to a square antiprism. Intermolecular interactions N…H–O, C–H…O, and C–H…F leading to the formation of supramolecular chains are observed in crystals of the complex. The UV-irradia

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Neugebauer, Peter, Uwe Klingebiel, and Mathias Noltemeyer. "Silylfurane und Bis(silyl)butadiine -Synthese, Lithiumderivate, Kristallstrukturen/ Silylfurans and Bis(silyl)butadiynes - Synthesis, Lithium Derivatives, Crystal Structures." Zeitschrift für Naturforschung B 55, no. 10 (2000): 913–23. http://dx.doi.org/10.1515/znb-2000-1005.

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AbstractFuran reacts with BuLi and halosilanes to give mono- (1, 5, 7), bis- (2, 6), tris- (3), and tetrakis(2-furanyl)silanes (4); (Fu-R; R = SiMe2Cl (1), SiisoPr2F (5), SitBu2F (7); Fu-R-Fu; R = SiMe2 (2), SiisoPr2 (6); Fu3SitBu (3), Fu4Si (4)), 2,5-Bis(silyl)furans (8, 9) are obtained in the reaction of dilithiated furan and fluorosilanes in a molar ratio 1:2 (R-Fu-R; R = SiisoPr2F (8), SitBu2F (9), 1,4-Bis(di-tert-butylfluorosilyl)butadiyne (10) is formed from furan four equivalents of BuLi, and two equivalents of F2SitBu2. 10 reacts with KOH to give tBu2(OH )Si-C =C -C =C-SitBu2OH (11). S

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Park, Hanna, Byeongho Kim, Kyoung-Chan Park, et al. "Biological Activities in Sapwood and Heartwood Extractives from Paulownia tomentosa." Forests 14, no. 11 (2023): 2171. http://dx.doi.org/10.3390/f14112171.

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Paulownia tomentosa is a representative deciduous tree in South Korea. After 10 years of growth, its wood can be used to make various products through chemical modifications, such as impregnation with a polymer, substitution with chemicals, and physical compression. However, research on the biological resistance of the sapwood and heartwood parts of P. tomentosa xylem is lacking. To ensure the complete utilisation of Paulownia wood, this study aimed to collect baseline data on the necessity of xylem extraction before chemical modification to enhance wood porosity. First, we assessed the decay

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Roacho, Robinson I., Alejandro Metta-Magaña, José L. Belmonte-Vázquez, Eduardo Peña-Cabrera, and Keith H. Pannell. "Formation of 8-RS-BODIPYs via direct substitution of 8-MeS-BODIPY by RSH (R = Et, Pr, Bu, tBu, n-C12H25, C6H5, p-MeC6H4, p-MeOC6H4, and 2,6-Me2C6H3)." Canadian Journal of Chemistry 94, no. 3 (2016): 234–39. http://dx.doi.org/10.1139/cjc-2015-0303.

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Reactions between 8-RS-BODIPY (R = Me, 1) and alkyl and aryl thiols were readily accomplished in dichloromethane to provide a synthetic pathway to a range of new 8-organothio-BODIPYs in good yield. The new alkyl 8-RS-BODIPYs (R = Et, 2; Pr, 3; Bu, 4; tBu, 5; n-dodecyl, 6) exhibit absorption and emission properties essentially unchanged from those of 1 whereas the arylthio analogs (R = Ph, 7; 2,6-Me2C6H3, 8; p-MeC6H4, 9; p-MeOC6H4, 10) exhibit no fluorescence with the exception of 7, and then only in hexane. In common with other related 8-substituted BODIPYs, the new 8-alkylthio-BODIPY dyes sho

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Della, EW, GM Elsey, and G. Skouroumounis. "Rearrangement of Substituted Bicyclo[2.1.1]hex-2-yl Mesylates Under Solvolytic Conditions." Australian Journal of Chemistry 43, no. 7 (1990): 1231. http://dx.doi.org/10.1071/ch9901231.

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When heated in formic acid, methyl 2-mesyloxybicyclo[2.1.1]hexane-2-carboxylate (3) ionizes significantly faster than expected and yields the rearranged isomer (6) essentially quantitatively. The latter, on the other hand, solvolyses at a much reduced rate. These data are interpreted as evidence for the presence in the ester of a favourable mesomeric interaction which largely offsets an otherwise destabilizing inductive effect when the ester is attached to a carbocationic centre. The corresponding cyano mesylates (8) and (29) were found to behave in an analogous manner when exposed to the solv

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Umaru, Isaac John, Sule John Ugbedeojo, Akafa Andes Tansaba, Chakfa Nanmar, Kerenhappuch Isaac Umaru, and Egeonu Stephen Ugoeze. "Antibacterial and Antioxidant Capacity of Methanol Root Extract of Mangifera Indica." African Journal of Biochemistry and Molecular Biology Research 1, no. 1 (2024): 35–50. https://doi.org/10.58578/ajbmbr.v1i1.3352.

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Recent years have witnessed enhanced research work reported on plants and plant products. In this regard, plants with traditional therapeutic usage are being screened more efficiently to be considered as a substitution or as a better alternative agent for Human Pathogens. Antioxidant activity, antibacterial, antifungal properties, colour, phytochemical and FT-IR spectral analysis of flowers belonging to Hibiscus moscheutos was determined. Radical scavenging activity of sample extracts were determined based on the percent inhibition of DPPH and ferric reducing antioxidant power (FRAP) assays. T

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Dominguez, Carmen, Lourdes Prieto, Matthew J. Valli, et al. "Methyl Substitution of 2-Aminobicyclo[3.1.0]hexane 2,6-Dicarboxylate (LY354740) Determines Functional Activity at Metabotropic Glutamate Receptors: Identification of a Subtype Selective mGlu2 Receptor Agonist." Journal of Medicinal Chemistry 48, no. 10 (2005): 3605–12. http://dx.doi.org/10.1021/jm040222y.

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Ginting, Mimpin. "Synthesis of 2-(4-Allyl-2-Methoxy Phenoxy)-N,N-Bis(2- Hydroxyethyl) Acetamide from the Transformation of Eugenol Isolated from Clove Oil." Journal of Chemical Natural Resources 1, no. 1 (2019): 31–39. http://dx.doi.org/10.32734/jcnar.v1i1.832.

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Eugenol as the main component of clove oil has been isolated through NaOH salting procedure followed by H2SO4hydrolysis, n-hexane partitioning and purification with vacuum distillation. 71% (v/v) eugenol was produced with purity of 97.70% based on gas chromatography analysis. 2-(4-allyl-2-methoxy phenoxy)-N,N-bis(2-hydroxyethyl) acetamide compound has the potential as antibacterial or substances for medicine in pharmaceutical can be synthesized from eugenol isolated through alkoxylation, esterification and followed by amidase. Alkoxylation was done using Williamson method through NaOH transfor

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Benhissen, Saliha, Siham Bounadji, Feriel Kheira Kebaili, et al. "Direct and delayed effect of the plant Cleome amblyocarpa Barratte & Murb (Capparidaceae) on the two species of (Blattodea) Blattella germanica (Linnaeus, 1767) and Shelfordella lateralis (Walker, 1868)." Studia Universitatis Babeş-Bolyai Biologia 69, no. 2 (2024): 95–108. https://doi.org/10.24193/subbbiol.2024.2.06.

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Finding substantial substitution of chemical pesticides to control cockroaches, which were proved to have a link with multiple health issues, has become the major target of many researchers. In fact, subjecting this pest to the effects of toxic plants extracts is considered ideal to primarily avoid jeopardizing human health. This study is divided into two objectives. The first of which is to confirm the toxicity of the ethanoic extract from the Cleome arabica plant on two species of urban cockroaches; which are Bllattella germanica and Bllatta lateralis, while the second is to verify the effec

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Kaur, Gunpreet, Vikas Gupta, R. G. Singhal, and Parveen Bansal. "Isolation and Characterization of Stigmasterol from Fritillaria roylei." Biology, Medicine, & Natural Product Chemistry 9, no. 2 (2020): 77–80. http://dx.doi.org/10.14421/biomedich.2020.92.77-80.

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Fritillaria roylei (Kshirakakoli) is the threatened species of “Ashtwarga” group suffers lot of confusion for identification & authentification in Ayurvedic system of medicine. Due to lack of natural sources and insufficient availability of kshirakakoli, chances of adulteration and substitution increases which in turn leads to loss of faith of people in herbal drugs. Thus for identification and differentiation, quality standardization and quality assurance of kshirakakoli containing herbal formulations there is a need to isolate chemical marker compound using advanced analytical techniques

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Vakhitova, L. M., N. A. Taran, V. I. Bessarabov, R. A. Vakhitov, G. F. Rayenko, and A. F. Popov. "Rheologically improved microemulsion for deactivation of simulants of blister and nerve agents." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 6 (December 2023): 44–52. http://dx.doi.org/10.32434/0321-4095-2023-151-6-44-52.

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The efficiency of decontamination of blister and nerve agents was studied using the example of nucleophilic decomposition of paraoxone (O,O-diethyl-O-4-nitrophenyl phosphate) and oxidation of methylphenyl sulfide. Hydrogen peroxide solutions in an oil-in-water microemulsion containing synthetic nanoclay Laponite EP and polyvinylpyrrolidone polymer were studied as reactive decontamination systems. The base of the microemulsion consisted of an aqueous phase, a codetergent (isopropanol), oil (hexane), with a variation of detergent (cetylpyridinium chloride, sodium dodecyl sulfate, and Triton X-10

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Arnold, Deirdre I., F. Albert Cotton, John H. Matonic, and Carlos A. Murillo. "Substitution on a methyl group of an acetylacetonate ligand: synthesis and structural characterization of oxobis[6-(phenylamino)hexane-2,4-dionato-O,O′]vanadium(IV), VO(Phad)2." Chem. Commun., no. 18 (1996): 2113–14. http://dx.doi.org/10.1039/cc9960002113.

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Jean-Baptiste, KANGAH Niameke, KODJO Charles Guillaume, OUATTARA Zana Adama, et al. "Synthesis, Characterization and Biological Evaluation of New Series of Schiff Bases Derived from Hexamethylenediamine as Potential Antibacterial and Antifungal Agents." IRA-International Journal of Applied Sciences (ISSN 2455-4499) 7, no. 2 (2017): 69. http://dx.doi.org/10.21013/jas.v7.n2.p3.

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<div><p><em>We report herein synthesis, characterization and antimicrobial activity of four Shiff bases derived from hexamethylenediamine. Substitution of a nitro group on each aromatic ring in ortho, meta or para positions of N,N'-bis(phenylmethyl)hexane-1,6-diimineallowed to have a homogeneous series of positional isomers. These four symmetric diimine Schiff bases were characterized by conventional spectrometry methods (NMR, IR, MS), then tested against Gram-positive and Gram-negative bacterial strains. Among them, compounds <strong>1b</strong>, <strong>1c

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Ahmed, Tahseen, Ambreen Huma, Munnawar Rasheed, et al. "Pharmacognostic Standardization and Phycochemical Evaluation of Green Seaweed Codium Flabellatum." Journal of Hunan University Natural Sciences 49, no. 6 (2022): 111–19. http://dx.doi.org/10.55463/issn.1674-2974.49.6.12.

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Codium flabellatum, a green seaweed belonging to the Codiaceae family, is renowned for its therapeutic effects, which may be attributed to the number of bioactive compounds it contains. Pharmacognostic standardization and phytochemical evaluation establish the identification of a specific plant and are valuable for authentication and the prevention of adulteration and substitution. In the current study, pharmacognostic studies were conducted through microscopic and macroscopic observations, and three different extracts (ethanol, ethyl acetate, and n-hexane) of Codium flabellatum were subjected

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Bishimbayeva, G. K., A. M. Nalibayeva, S. A. Saidullayeva, A. K. Zhanabaeva, A. Bold, and Y. N. Abdikalykov. "Synthesis and study of the extraction properties ofnew phosphorus-containing extractants of heavy metals." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 3 (2021): 340–48. http://dx.doi.org/10.21285/2227-2925-2021-11-3-340-348.

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Abstract: The metallurgical industry is one of the cornerstones of contemporary chemical science and industry and it is developing rapidly in many countries. The widespread introduction of metal extraction, concentration and separation as the most productive methods entails the need to search for and create new effective metal extractants. Among the compounds, suitable for use as extractants, the most widespread are organic phosphites and phosphates, which allow performing extraction processes with good selectivity and efficiency. The purposes of this article include finalizing the optimal syn

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Brodie, Nancy M. J., and Anthony J. Poë. "Systematic substitution kinetics of the clusters Ru3(CO)11L and Ru3(CO)10L2 (L = P-donor ligands): The unimolecular path." Canadian Journal of Chemistry 73, no. 7 (1995): 1187–95. http://dx.doi.org/10.1139/v95-146.

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The kinetics have been studied of the substitution reactions of Ru3(CO)11L and Ru3(CO)10L2 (L = PCy3 (Cy = C6H11), P-n-Bu3, P(p-MeOC6H4)3, P(p-ClC6H4)3, P(OPh)3 and etpb (P(OCH2)3CEt) with AsPh3 or various P-donor nucleophiles, L′, in hexane. The reactions proceed through both [L′]- independent (CO dissociative) and [L′]-dependent (associative) paths. The values of the rate constants, k1, for the dissociative path for Ru3(CO)11L can be combined with other published data and are found to fit well to the equation: log k1 = α + βLδL + γLθL (βL and γL are constants that define how sensitive the va

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Szczęsna, Weronika, Marta Tsirigotis-Maniecka, Łukasz Lamch, et al. "Multilayered Curcumin-Loaded Hydrogel Microcarriers with Antimicrobial Function." Molecules 27, no. 4 (2022): 1415. http://dx.doi.org/10.3390/molecules27041415.

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The design of multifunctional microcarriers has attracted significant attention because they combine various functions within a single system. In this study, we developed a set of multilayered hydrogel microcarriers, which were first loaded with chemotherapeutic curcumin (CUR), then, using the layer-by-layer (LbL) technique, coated through a polyelectrolyte shell consisting of chitosan (CHIT) or poly(allylamine hydrochloride) (PAH). As an outer layer with antimicrobial function, newly synthesised alkylene quaternary ammonium salt functionalised polyelectrolytes (A-QAS-PEs) were applied. For th

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