Log in

Relevant bibliographies by topics / Aldol condensation reaction / Journal articles

To see the other types of publications on this topic, follow the link: Aldol condensation reaction.

Journal articles on the topic 'Aldol condensation reaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Aldol condensation reaction.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Inegbenebor, Adedayo I., Raphael C. Mordi, and Oluwakayode M. Ogunwole. "Zeolite Catalyzed Aldol Condensation Reactions." International Journal of Applied Sciences and Biotechnology 3, no. 1 (March 15, 2015): 1–8. http://dx.doi.org/10.3126/ijasbt.v3i1.12291.

Full text

Abstract:

The review is based on the description of zeolite structure, uses, synthesis, and catalytic aldol reaction in aldol condensation. An internal aldolcondensation reaction has been achieved over ZSM-5 zeolite with high silica-alumina ratio at 350oC. It therefore follows that zeolite canfunction as a catalyst in aldol type condensation reactions and that weak acid sites as well as a small number of active sites favor the aldolcondensation reaction of carbonyl compounds. However, the mixed condensation product was found to be favored at temperatures above 300oCand the self-condensation of ethanal to crotonaldehyde was favored at temperatures below 300oC. It has also been suggested that both Brønstedand Lewis acids are involved in aldol reactions with Lewis acid sites the most probable catalytic sites. The zeolite group of minerals has founduse in many chemical and allied industries.DOI: http://dx.doi.org/10.3126/ijasbt.v3i1.12291 Int J Appl Sci Biotechnol, Vol. 3(1): 1-8

APA, Harvard, Vancouver, ISO, and other styles

2

Witzig, Reto M., and Christof Sparr. "Synthesis of Enantioenriched Tetra-ortho-3,3′-substituted Biaryls by Small-Molecule-Catalyzed Noncanonical Polyketide Cyclizations." Synlett 31, no. 01 (October 22, 2019): 13–20. http://dx.doi.org/10.1055/s-0039-1690215.

Full text

Abstract:

The arene-forming aldol condensation is a fundamental reaction in the biosynthesis of aromatic polyketides. Precisely controlled by the polyketide synthases, the highly reactive poly-β-carbonyl substrates are diverged into numerous aromatic natural products by selective cyclization reactions; a fascinating biosynthetic strategy that sparked our interest to investigate atroposelective aldol condensations. In this Account, we contextualize and highlight the ability of small-molecule catalysts to selectively convert noncanonical hexacarbonyl substrates in a double arene-forming aldol condensation resulting in the atroposelective synthesis of tetra-ortho-3,3′-substituted biaryls. The hexacarbonyl substrates were obtained by a fourfold ozonolysis enabling a late-stage introduction of all carbonyl functions in one step. Secondary amine catalysts capable of forming an extended hydrogen-bonding network triggered the noncanonical polyketide cyclization in order to form valuable biaryls in high yields and with stereocontrol of up to 98:2 er.1 Biosynthesis of Aromatic Polyketides2 Rotationally Restricted Aromatic Polyketides3 3,3′-Substituted Binaphthalenes in Catalysis4 Stereoselective Synthesis of Atropisomers5 Synthesis of Enantioenriched Tetra-ortho-3,3′-Substituted Biaryls by the Atroposelective Arene-Forming Aldol Condensation6 Conclusion

APA, Harvard, Vancouver, ISO, and other styles

3

Raston, Colin L., and Janet L. Scott. "Chemoselective, solvent-free aldol condensation reaction." Green Chemistry 2, no. 2 (2000): 49–52. http://dx.doi.org/10.1039/a907688c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Eskendirov, Igor, Bukasa Kabongo, Leslie Glasser, and Valery D. Sokolovskii. "Kinetics by thermometry: an aldol condensation reaction." Journal of the Chemical Society, Faraday Transactions 91, no. 6 (1995): 991. http://dx.doi.org/10.1039/ft9959100991.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Saikia, Hemaprobha, and Sanjay Basumatary. "MgRuAl-layered Double Hydroxides (LDH): An Efficient Multifunctional Catalyst for Aldol Condensation and Transfer Hydrogenation Reactions." Current Catalysis 8, no. 1 (June 21, 2019): 62–69. http://dx.doi.org/10.2174/2211550108666190418125857.

Full text

Abstract:

Background: Layered double hydroxides (LDH) are drawing much attention as solid catalysts in recent years and have applications in various organic transformations as they possess a variety of basic sites which could be obtained by exchange of metal ions or by intercalation of suitable anions into their interlayer space. Ru based complexes have widespread catalytic applications in many organic reactions. Herein, novel ruthenium containing ternary LDH has been synthesized and used as a multifunctional catalyst for Aldol condensation and transfer hydrogenation reactions. Methods: Ternary LDH multifunctional catalyst containing Mg, Ru and Al was prepared by coprecipitation and hydrothermal treatment. The catalyst was characterized by elemental analysis, Powder XRD, FT-IR, BET, TGA, DRS, SEM, EDX, XPS and TEM. The products of the reactions were characterized by 1H NMR and GC-MS. Results: The analysis of catalyst revealed incorporation of Ru in the brucite layers of the LDH and showed the mosaic single crystal with BET surface area of 84.25 m2 g-1. This catalyst yielded 85–98% products for Aldol condensation reactions within 4 h reaction time, and 82–98% products for transfer hydrogenation reactions within 16 h reaction time. Conclusion: The resultant MgRuAl-LDH with acid and base sites was found to be highly active and selective for one-step synthesis of nitrile compounds. The catalyst works more efficiently for Aldol condensation reactions in shorter reaction times compared to transfer hydrogenation reactions.

APA, Harvard, Vancouver, ISO, and other styles

6

Thongnuam, Worawaran, Suwapich Pornsatitworakul, Thana Maihom, Piti Treesukol, Nongpanga Jarussophon, Phornphimon Maitarad, Kanokwan Kongpatpanich, and Bundet Boekfa. "An Experimental and Theoretical Study on the Aldol Condensation on Zirconium-Based Metal-Organic Framework." Key Engineering Materials 757 (October 2017): 98–102. http://dx.doi.org/10.4028/www.scientific.net/kem.757.98.

Full text

Abstract:

The aldol condensation of acetone in zirconium-based metal-organic framework functionalized by a sulfonic acid group (UiO-66-SO3H) has been theoretically investigated using the density functional theory. Acetone adsorbed on the UiO-66-SO3H with the adsorption energy of -17.4 kcal/mol. The catalyzed reaction has been proposed to be a two-step mechanism: the tautomerization of keto form to produce enol form of acetone, and the aldol condensation to produce diacetone alcohol. The activation energies were calculated to be 27.2 and 6.4 kcal/mol, respectively. For the experimental part, UiO-66-SO3H catalyst was synthesized and characterized by X-ray diffraction and IR spectroscopy. The catalytic reaction was carried out in a stirred batch reactor at different temperatures to optimize the reaction conditions. The obtained products were analyzed by 1H-NMR spectroscopy and chromatography techniques. This study demonstrated that UiO-66-SO3H can be used as a solid catalyst for the aldol condensation reaction.

APA, Harvard, Vancouver, ISO, and other styles

7

Zhang, Ya-Fei, Shao-Jie Yin, Min Zhao, Jun-Qi Zhang, Hai-Yan Li, and Xing-Wang Wang. "Dinuclear zinc-catalyzed desymmetric intramolecular aldolization: an enantioselective construction of spiro[cyclohexanone-oxindole] derivatives." RSC Advances 6, no. 36 (2016): 30683–89. http://dx.doi.org/10.1039/c6ra02296k.

Full text

Abstract:

A bis-ProPhenol zinc complex-catalyzed asymmetric desymmetrizing intramolecular aldol or aldol condensation reaction is reported, which furnishes spiro[cyclohexanone-oxindole] derivatives in good yields with moderate to high enantioselectivities.

APA, Harvard, Vancouver, ISO, and other styles

8

Abedi, Sedigheh, Alireza Azhdari Tehrani, Hosein Ghasempour, and Ali Morsali. "Interplay between hydrophobicity and basicity toward the catalytic activity of isoreticular MOF organocatalysts." New Journal of Chemistry 40, no. 8 (2016): 6970–76. http://dx.doi.org/10.1039/c6nj00480f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Dreier, Anna-Lena, Andrej V. Matsnev, Joseph S. Thrasher, and Günter Haufe. "Syn-selective silicon Mukaiyama-type aldol reactions of (pentafluoro-λ6-sulfanyl)acetic acid esters with aldehydes." Beilstein Journal of Organic Chemistry 14 (February 8, 2018): 373–80. http://dx.doi.org/10.3762/bjoc.14.25.

Full text

Abstract:

Aldol reactions belong to the most frequently used C–C bond forming transformations utilized particularly for the construction of complex structures. The selectivity of these reactions depends on the geometry of the intermediate enolates. Here, we have reacted octyl pentafluoro-λ6-sulfanylacetate with substituted benzaldehydes and acetaldehyde under the conditions of the silicon-mediated Mukaiyama aldol reaction. The transformations proceeded with high diastereoselectivity. In case of benzaldehydes with electron-withdrawing substituents in the para-position, syn-α-SF5-β-hydroxyalkanoic acid esters were produced. The reaction was also successful with meta-substituted benzaldehydes and o-fluorobenzaldehyde. In contrast, p-methyl-, p-methoxy-, and p-ethoxybenzaldehydes led selectively to aldol condensation products with (E)-configured double bonds in 30–40% yields. In preliminary experiments with an SF5-substituted acetic acid morpholide and p-nitrobenzaldehyde, a low amount of an aldol product was formed under similar conditions.

APA, Harvard, Vancouver, ISO, and other styles

10

Nagumo, Shinji, Aki Matsukuma, Fumiko Inoue, Takayoshi Yamamoto, Hiroshi Suemune, and Kiyoshi Sakai. "Ring cleavage reaction based on intermolecular aldol condensation." Journal of the Chemical Society, Chemical Communications, no. 21 (1990): 1538. http://dx.doi.org/10.1039/c39900001538.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Vuk, Dragana, Irena Škorić, Valentina Milašinović, Krešimir Molčanov, and Željko Marinić. "A simple and easy to perform synthetic route to functionalized thienyl bicyclo[3.2.1]octadienes." Beilstein Journal of Organic Chemistry 16 (May 22, 2020): 1092–99. http://dx.doi.org/10.3762/bjoc.16.96.

Full text

Abstract:

In order to prepare novel polycyclic derivatives of bicyclo[3.2.1]octadiene systems fused with a thiophene ring, photochemical cyclization and aldol condensation reactions were carried out. The starting substrates were easily obtained by a Vilsmeier–Haack reaction of bicyclo[3.2.1]octadiene thiophene derivatives with dimethylformamide. From the obtained carbaldehydes, novel methyl, methoxy, and cyano-substituted styryl thienobenzobicyclo[3.2.1]octadiene derivatives were synthesized through Wittig reactions and subjected to photochemical cyclization, in terms of obtaining the new annulated structures. As part of this study, the aldol reaction of the starting 2-substituted carbaldehyde with acetone was also performed, which produced the thieno-fused benzobicyclo[3.2.1]octadiene compound with an extended conjugation.

APA, Harvard, Vancouver, ISO, and other styles

12

Pavliuk, N. S., V. V. Ivasiv, O. M. Orobchuk, D. S. Shevchenko, and R. V. Nebesnyi. "Kinetics of aldol condensation of acetic acid with formaldehyde on B–P–V–W–OX/SiO2 catalyst." Chemistry, Technology and Application of Substances 3, no. 2 (November 1, 2020): 39–45. http://dx.doi.org/10.23939/ctas2020.02.039.

Full text

Abstract:

New catalysts B–P–V–W–Ox/SiO2 of gas-phase condensation of acetic acid from formaldehyde to acrylic acid on an industrial carrier of stable chemical composition (colloidal silicon oxide, Aerosil A-200) were synthesized. It is shown that the hydrothermal treatment of the carrier allows to increase the activity and selectivity of the catalyst in the reactions of aldol condensation of acetic acid with formaldehyde. It was found that the developed catalyst is effective in the condensation reaction of acetic acid with formaldehyde, which allows to obtain acrylic acid with a yield of 68.7% and a selectivity of 94.1%. The kinetic regularities of the reaction on this catalyst are established. According to the proposed kinetic equations, kinetic parameters are calculated that describe the condensation reaction of acetic acid with formaldehyde.

APA, Harvard, Vancouver, ISO, and other styles

13

Rojas-Buzo, Sergio, Pilar García-García, and Avelino Corma. "Hf-based metal–organic frameworks as acid–base catalysts for the transformation of biomass-derived furanic compounds into chemicals." Green Chemistry 20, no. 13 (2018): 3081–91. http://dx.doi.org/10.1039/c8gc00806j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Thai, Nguyen Thi, and Nguyen Thi Minh Thu. "Vanillin conversion by aldol condensation using hydrotalcite Mg-Al and modified-Y zeolite as heterogeneous catalysts." Vietnam Journal of Science and Technology 59, no. 1 (January 25, 2021): 66. http://dx.doi.org/10.15625/2525-2518/59/1/15428.

Full text

Abstract:

Mg-Alhydrotalcite, MgO-Al2O3 mixed oxides and modified-Y zeolite (sulfated Y zeolite and copper ion-exchanged Y zeolite) were prepared and characterized by XRD, EDX and XRF techniques. These materials were used as heterogeneous catalysts in aldol condensation of vanillin and acetone.The obtained results showed that the heterogeneous acid catalysts as modified-Y zeolites were more effective than the heterogeneous base catalysts as hydrotalcite Mg-Al and MgO-Al2O3 mixed oxides in aldol condensation reaction of vanillin. The highest conversion of vanillin was 95.5% when the reaction was carried out at 120oC in 5 hours, using sulfated Y zeolite.

APA, Harvard, Vancouver, ISO, and other styles

15

Bharali, Dipshikha, Rasna Devi, Pankaj Bharali, and Ramesh C. Deka. "Synthesis of high surface area mixed metal oxide from the NiMgAl LDH precursor for nitro-aldol condensation reaction." New Journal of Chemistry 39, no. 1 (2015): 172–78. http://dx.doi.org/10.1039/c4nj01332h.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Jing, Tao, Jing Zhi Tian, and De Zhi Sun. "Synthetic Technics of Methyl Acrylate through Aldol Condensation with a Multisubsection Fixed-Bed Reactor." Advanced Materials Research 233-235 (May 2011): 2859–62. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2859.

Full text

Abstract:

Two types of catalysts, V2O5-P2O5/SiO2and Cs-Sb2O5/SiO2, were separately prepared with SiO2as carrier. Their catalytic properties were investigated in the process of synthesizing methyl acrylate through aldol condensation with methylal and methyl acetate, and the influence of the catalyst’s filling up technique on the reaction was studied. Reactions were performed in a fixed-bed reactor. The research results indicate that aldol condensation reaction is effectively promoted when the two catalysts were filled up in appropriate subsections of the reaction tube. Specifically, when V-Si-P Oxide was filled up at the 4thsubsection and Cs-Sb2O5/SiO2catalyst at the 6thsubsection with the temperature of the reactor at 400 °C and the mol ratio of methyl acetate and methylal at 1.6:1 and the space velocity at 3.2 h-1, then the conversion rate of methylal was 50.9%, the selectivity of methyl acrylate was 90.63%, and the ester yield of methyl acrylate was 46.15%.

APA, Harvard, Vancouver, ISO, and other styles

17

Tišler, Zdeněk, Pavla Vondrová, Kateřina Hrachovcová, Kamil Štěpánek, Romana Velvarská, Jaroslav Kocík, and Eliška Svobodová. "Aldol Condensation of Cyclohexanone and Furfural in Fixed-Bed Reactor." Catalysts 9, no. 12 (December 14, 2019): 1068. http://dx.doi.org/10.3390/catal9121068.

Full text

Abstract:

Aldol condensation reaction is usually catalysed using homogeneous catalysts. However, the heterogeneous catalysis offers interesting advantages and the possibility of cleaner biofuels production. Nowadays, one of the most used kinds of heterogeneous catalysts are hydrotalcites, which belong to a group of layered double hydroxides. This paper describes the aldol condensation of cyclohexanone (CH) and furfural (F) using Mg/Al mixed oxides and rehydrated mixed oxides in order to compare the catalyst activity after calcination and rehydration, as well as the possibility of its regeneration. The catalysts were synthesized by calcination and subsequent rehydration of the laboratory-prepared and commercial hydrotalcites, with Mg:Al molar ratio of 3:1. Their structural and chemical properties were determined by several analytical methods (inductively coupled plasma analysis (ICP), X-ray diffraction (XRD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), specific surface area (BET), thermogravimetric analysis (TGA), temperature programmed desorption (TPD)). F-CH aldol condensation was performed in a continuous fixed-bed reactor at 80 °C, CH:F = 5:1, WHSV 2 h−1. The rehydrated laboratory-prepared catalysts showed a 100% furfural conversion for more than 55 h, in contrast to the calcined ones (only 24 h). The yield of condensation products FCH and F2CH was up to 68% and 10%, respectively. Obtained results suggest that Mg/Al mixed oxides-based heterogeneous catalyst is suitable for use in the aldol condensation reaction of furfural and cyclohexanone in a fixed-bed reactor, which is an interesting alternative way to obtain biofuels from renewable sources.

APA, Harvard, Vancouver, ISO, and other styles

18

Liang, Ning, Xiaolong Zhang, Hualiang An, Xinqiang Zhao, and Yanji Wang. "Direct synthesis of 2-ethylhexanol via n-butanal aldol condensation–hydrogenation reaction integration over a Ni/Ce-Al2O3 bifunctional catalyst." Green Chemistry 17, no. 5 (2015): 2959–72. http://dx.doi.org/10.1039/c5gc00223k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Ma, Zhanling, Xiangang Ma, Hongchao Liu, Yanli He, Wenliang Zhu, Xinwen Guo, and Zhongmin Liu. "A green route to methyl acrylate and acrylic acid by an aldol condensation reaction over H-ZSM-35 zeolite catalysts." Chemical Communications 53, no. 65 (2017): 9071–74. http://dx.doi.org/10.1039/c7cc04574c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Elečko, Pavol, Štefan Toma, Miroslav Vrúbel, and Eva Solčániová. "Reactivity of [m]ferrocenophanones: The aldol condensation." Collection of Czechoslovak Chemical Communications 51, no. 5 (1986): 1112–18. http://dx.doi.org/10.1135/cccc19861112.

Full text

Abstract:

Investigation of the reaction of [m]ferrocenophanones with p-chlorobenzaldehyde in basic medium showed that these cyclic ketones are much more reactive than their acyclic counterparts. The size of the bridge and the position of the carbonyl group influenced the reaction. Thus, [m]ferrocenophan-1-ones (m =3,4 afforded β-hydroxyketones only, [5]ferrocenophan-1-one gave in addition an α,β-unsaturated ketone, and [4]ferrocenophane-2-one yielded only α,β-unsaturated ketones. Oxidation of [m]ferrocenophanes with MnO2 furnished the expected monoketones and [4]ferrocenophane-1,4-dione and [5[ferrocenophane-1,2-dione. The preparation of [5]ferrocenophane-1,5-dione was also improved.

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang, Hao, Panlei Wang, Yi Zhang, Bowen Cheng, Ruoying Zhu, and Fan Li. "Synthesis of a novel arginine-modified starch resin and its adsorption of dye wastewater." RSC Advances 10, no. 67 (2020): 41251–63. http://dx.doi.org/10.1039/d0ra05727d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Riveira, Martín J., and Ariel M. Sarotti. "NMR and experimental reinvestigation of the condensation reaction between γ-methylene-α,β-unsaturated aldehydes and propargyl aldehydes." Organic & Biomolecular Chemistry 16, no. 9 (2018): 1442–47. http://dx.doi.org/10.1039/c7ob03110f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Pradika, Yuri, Deni Pranowo, and Sabirin Matsjeh. "Synthesis of 4-(5-Bromo-4-Hydroxyphenyl-3-Methoxy)-2-Butanone and the Activity Test as Fruit Flies Attractant." Key Engineering Materials 840 (April 2020): 113–17. http://dx.doi.org/10.4028/www.scientific.net/kem.840.113.

Full text

Abstract:

Synthesis of 4-(5-bromo-4-hydroxyphenyl-3-methoxy)-2-butanone and its potential test as fruit flies attractant has been done. All of products were analyzed by FT-IR GC-MS, and 1H-NMR. Synthesis of 4-(5-bromo-4-hydroxyphenyl-3-methoxy)-2-butanone was carried out in three steps reaction. First, the bromination of vanillin was performed using KBrO3 and HBr in acidic condition. Second, aldol condensation of 5-bromovanillin with acetone using base catalyst NaOH 20%. Third, 4-(5-bromo-4-hydroxyphenyl-3-methoxy)-2-butanone was synthesized by reacting the reduction reaction of condensation aldol products with NaBH4 and NiCl2.6H2O in methanol solvent in mild condition. Based on FT-IR, GC-MS and 1H-NMR analyses, the synthesis of 4-(5-bromo-4-hydroxyphenyl-3-methoxy)-2-butanone has been successfully by selective hydrogenation reaction with 68% yield. Testing the result as attractant of fruit fly indicated that synthesized compound can be used as attractant.

APA, Harvard, Vancouver, ISO, and other styles

24

Weatherston, Joshua D., Nolan C. Worstell, and Hung-Jen Wu. "Quantitative surface-enhanced Raman spectroscopy for kinetic analysis of aldol condensation using Ag–Au core–shell nanocubes." Analyst 141, no. 21 (2016): 6051–60. http://dx.doi.org/10.1039/c6an01098a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Pieczonka, Adam Marek, Lena Marciniak, Michał Rachwalski, and Stanisław Leśniak. "Enantiodivergent Aldol Condensation in the Presence of Aziridine/Acid/Water Systems." Symmetry 12, no. 6 (June 2, 2020): 930. http://dx.doi.org/10.3390/sym12060930.

Full text

Abstract:

A series of novel chiral imines was synthesized from corresponding aldehydes and 1-(2-aminoalkyl)aziridines with good chemical yields. Such imines were tested as catalysts in the direct asymmetric aldol reaction between aromatic aldehydes and acetone/cyclohexanone in the presence of catalytic amounts of water and an acidic additive. The corresponding aldol products were formed in excellent yields and with very high enantioselectivities (98% and 99% ee, respectively).

APA, Harvard, Vancouver, ISO, and other styles

26

Suemune, Hiroshi, Osamu Yoshida, Jun Uchida, Yukiko Nomura, Masakazu Tanaka, and Kiyoshi Sakai. "Asymmetric ring cleavage reaction based on crossed aldol condensation." Tetrahedron Letters 36, no. 40 (October 1995): 7259–62. http://dx.doi.org/10.1016/0040-4039(95)01504-b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Wang, Huimin, Weihan Bing, Chunyuan Chen, Yusen Yang, Ming Xu, Lifang Chen, Lei Zheng, et al. "Geometric effect promoted hydrotalcites catalysts towards aldol condensation reaction." Chinese Journal of Catalysis 41, no. 8 (August 2020): 1279–87. http://dx.doi.org/10.1016/s1872-2067(20)63556-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Bing, Weihan, Huimin Wang, Lei Zheng, Deming Rao, Yusen Yang, Lirong Zheng, Bin Wang, Yangdong Wang, and Min Wei. "A CaMnAl-hydrotalcite solid basic catalyst toward the aldol condensation reaction with a comparable level to liquid alkali catalysts." Green Chemistry 20, no. 13 (2018): 3071–80. http://dx.doi.org/10.1039/c8gc00851e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Li, Wenzhi, Mingxue Su, Tao Yang, Tingwei Zhang, Qiaozhi Ma, Song Li, and Qifu Huang. "Preparation of two different crystal structures of cerous phosphate as solid acid catalysts: their different catalytic performance in the aldol condensation reaction between furfural and acetone." RSC Advances 9, no. 30 (2019): 16919–28. http://dx.doi.org/10.1039/c9ra02937k.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Dong, Penghui, Kashif Majeed, Lingna Wang, Zijian Guo, Fengtao Zhou, and Qiuyu Zhang. "Transition metal-free approach to azafluoranthene scaffolds by aldol condensation/[1+2+3] annulation tandem reaction of isocyanoacetates with 8-(alkynyl)-1-naphthaldehydes." Chemical Communications 57, no. 39 (2021): 4855–58. http://dx.doi.org/10.1039/d1cc01015h.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Reddy, Julakanti Satyanarayana, Marri Gangababu, Patel Manimala, Aluru Rammohan, and Jillu Singh Yadav. "Studies towards the Total Synthesis of Kadcotrione B." Synthesis 52, no. 05 (November 21, 2019): 735–43. http://dx.doi.org/10.1055/s-0039-1691494.

Full text

Abstract:

A convergent and efficient approach towards the total synthesis of Kadcotrione B is described. For this purpose, the syntheses of two fragments, 6/6/5-fused tricyclic ring and C-9 side chain, were accomplished. The salient features of these syntheses are the utilization of aldol condensation, Evans aldol reaction, Horner–Wadsworth–Emmons olefination, Michael addition, Robinson annulation, and Wacker oxidation.

APA, Harvard, Vancouver, ISO, and other styles

32

Hu, Yingjie, Yuxin Mei, Baining Lin, Xuhong Du, Fan Xu, Huasheng Xie, Kang Wang, and Yonghua Zhou. "An active and stable multifunctional catalyst with defective UiO-66 as a support for Pd over the continuous catalytic conversion of acetone and hydrogen." RSC Advances 11, no. 1 (2021): 48–56. http://dx.doi.org/10.1039/d0ra09217g.

Full text

Abstract:

The one-pot synthesis of methyl isobutyl ketone (MIBK) and methyl isobutyl methanol (MIBC) from acetone and hydrogen is a typical cascade reaction comprised of aldol condensation-dehydration-hydrogenation.

APA, Harvard, Vancouver, ISO, and other styles

33

Shintaku, Hiroshi, Kiyotaka Nakajima, Masaaki Kitano, and Michikazu Hara. "Efficient Mukaiyama aldol reaction in water with TiO4 tetrahedra on a hydrophobic mesoporous silica surface." Chem. Commun. 50, no. 88 (2014): 13473–76. http://dx.doi.org/10.1039/c4cc05711b.

Full text

Abstract:

A new heterogeneous catalyst, hydrophobic TiO₄-deposited mesoporous silica, exhibited high catalytic performance as a reusable catalyst for the Mukaiyama-aldol condensation in water without a surfactant.

APA, Harvard, Vancouver, ISO, and other styles

34

Voss, Jürgen, Rüdiger Röske, Gunnar Ehrlich, and Gunadi Adiwidjaja. "Unexpected isolation of a cyclohexenone derivative." Zeitschrift für Naturforschung B 74, no. 11-12 (December 18, 2019): 819–24. http://dx.doi.org/10.1515/znb-2019-0115.

Full text

Abstract:

AbstractKnoevenagel reaction of pivaloylacetone with formaldehyde and subsequent aldol condensation ends up with 3-methyl-4,6-dipivaloylcyclohex-2-enone. The structure of the product is proved by an X-ray structure determination.

APA, Harvard, Vancouver, ISO, and other styles

35

Fan, Dan, Xiuqin Dong, Yingzhe Yu, and Minhua Zhang. "A DFT study on the aldol condensation reaction on MgO in the process of ethanol to 1,3-butadiene: understanding the structure–activity relationship." Physical Chemistry Chemical Physics 19, no. 37 (2017): 25671–82. http://dx.doi.org/10.1039/c7cp04502f.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Peng, Peng, Jing-jing Wu, Jun-qing Liang, Tian-yu Zhang, Jin-wen Huang, and Fan-hong Wu. "Lithium triethylborohydride-promoted generation of α,α-difluoroenolates from 2-iodo-2,2-difluoroacetophenones: an unprecedented utilization of lithium triethylborohydride." RSC Advances 7, no. 88 (2017): 56034–37. http://dx.doi.org/10.1039/c7ra12130j.

Full text

Abstract:

Lithium triethylborohydride was found to promote the generation of α,α-difluoroenolates from 2-iodo-2,2-difluoroacetophenones, and applied to the synthesis of polyfluorinated β-hydroxy ketones via self-condensation or aldol reaction.

APA, Harvard, Vancouver, ISO, and other styles

37

Kalalbandi, Veerendra Kumar A., J. Seetharamappa, and Umesha Katrahalli. "Synthesis, crystal studies and in vivo anti-hyperlipidemic activities of indole derivatives containing fluvastatin nucleus." RSC Advances 5, no. 48 (2015): 38748–59. http://dx.doi.org/10.1039/c5ra02908b.

Full text

Abstract:

As a part of our efforts to prepare better analogues of fluvastatin for the treatment of hyperlipidemia, we have synthesized some indole derivatives containing a fluvastatin nucleus by methanol mediated Claisen–Schmidt aldol condensation reaction.

APA, Harvard, Vancouver, ISO, and other styles

38

Gazieva, Galina A., Alexei N. Izmest'ev, Yulia V. Nelyubina, Natalya G. Kolotyrkina, Igor E. Zanin, and Angelina N. Kravchenko. "Synthesis of imidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazine-2,8-diones via a rearrangement of imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7-diones in the reaction with isatins." RSC Advances 5, no. 55 (2015): 43990–4002. http://dx.doi.org/10.1039/c5ra07669b.

Full text

Abstract:

An aldol condensation/skeletal rearrangement protocol for the synthesis of 7-ylideneimidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazines via the reaction of imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazines and isatins has been developed.

APA, Harvard, Vancouver, ISO, and other styles

39

Tomer, Sanjiv O., and Hemant P. Soni. "Fe3O4@l-Proline/Pd nanocomposite for one-pot tandem catalytic synthesis of (±)-warfarin from benzyl alcohol: synergistic action of organocatalyst and transition metal catalyst." Catalysis Science & Technology 9, no. 22 (2019): 6517–31. http://dx.doi.org/10.1039/c9cy01497g.

Full text

Abstract:

One-pot synthesis of (±)-warfarin from scratch! The reported catalytic nanocomposite can carry out 3-way catalysis, namely, oxidation, aldol condensation and Michael addition, in a tandem fashion in PEG-400 and water as 'green' reaction media.

APA, Harvard, Vancouver, ISO, and other styles

40

Scheerer, Jonathan, Jill Williamson, and Emily Smith. "A Merged Aldol Condensation, Alkene Isomerization, Cycloaddition/Cycloreversion Sequence Employing Oxazinone Intermediates for the Synthesis of Substituted Pyridines." Synlett 28, no. 10 (February 23, 2017): 1170–72. http://dx.doi.org/10.1055/s-0036-1588729.

Full text

Abstract:

A domino reaction sequence has been evaluated that begins with union of novel dihydrooxazinone precursors with 2-alkynyl-substituted benzaldehyde components through aldol condensation. Ensuing operations, including alkene isomerization, Diels–Alder, and retrograde Diels–Alder with loss of CO2 occurs in the same reaction vessel to provide polysubstituted tricyclic pyridine products.

APA, Harvard, Vancouver, ISO, and other styles

41

Cui, Han-Feng, Lian Wang, Li-Jun Yang, Jing Nie, Yan Zheng, and Jun-An Ma. "Direct aldol condensation reaction of ethyl diazoacetate with trifluoromethyl ketones." Tetrahedron 67, no. 44 (November 2011): 8470–76. http://dx.doi.org/10.1016/j.tet.2011.09.009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

NAGUMO, S., A. MATSUKUMA, F. INOUE, T. YAMAMOTO, H. SUEMUNE, and K. SAKAI. "ChemInform Abstract: Ring Cleavage Reaction Based on Intermolecular Aldol Condensation." ChemInform 22, no. 15 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199115125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Doering, F. J., and G. F. Schaefer. "Reaction kinetics of the aldol condensation of mixed C7 aldehydes." Journal of Molecular Catalysis 41, no. 3 (August 1987): 313–28. http://dx.doi.org/10.1016/0304-5102(87)80109-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Liu, Shuang, Yu He, Yu Liu, Shuaibin Wang, Yajun Jian, Baoxin Li, and Chunli Xu. "One-step hydrothermal synthesis of chiral carbon dots with high asymmetric catalytic activity for an enantioselective direct aldol reaction." Chemical Communications 57, no. 30 (2021): 3680–83. http://dx.doi.org/10.1039/d1cc00755f.

Full text

Abstract:

Chiral carbon dots are prepared by a simple and one-step hydrothermal reaction at 180 °C for 2 h using citric acid and d-proline as precursors, which show high asymmetric catalytic activity for enantioselective direct aldol condensation.

APA, Harvard, Vancouver, ISO, and other styles

45

Xu, Jiafang, Jichao Liang, Sheng Huang, Ge Yang, Keyi Tian, Ruonan Chen, Hongyu Chen, and Yanhua Zhang. "On the Exceptionally High Loading of L-Proline on Multi-Wall Carbon Nanotubes." Catalysts 10, no. 11 (October 28, 2020): 1246. http://dx.doi.org/10.3390/catal10111246.

Full text

Abstract:

L-proline is directly loaded on the multi-wall carbon nanotubes (MWCNTs) with exceptionally high loading content of 67 wt.%. The obtained L-proline/MWCNTs catalyst is on par with the catalytic activity of free L-proline, even after 7 rounds of recycling and reusing. The excellent activity of L-proline/MWCNTs in typical Aldol reaction, Mannich reaction, Michael reaction, α-oxyamination reaction, and Knoevenagel condensation shows a broad applicability of the composite catalyst in different reactions and solvent systems. We believe that the unusual loading mode may open a window for designing heterogenized organo-catalysts.

APA, Harvard, Vancouver, ISO, and other styles

46

Suwito, Hery, Noorma Kurnyawaty, Ellyca Susetyo, Yuzkiya Azizah, Kautsar Ul Haq, Alfinda Novi Kristanti, and Indriani Indriani. "(E)-3-(2,5-Dimethoxyphenyl)-1-{[4-(2,5-dimethoxy-phenyl)-6-((E)-2,5-dimethoxystyryl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl]}prop-2-en-1-one and (E)-3-(2,5-Dimethoxyphenyl)-1-{[4-(2,5-dimethoxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl]}prop-2-en-1-one." Molbank 2019, no. 2 (June 4, 2019): M1063. http://dx.doi.org/10.3390/m1063.

Full text

Abstract:

Dihydropyrimidine derivatives possess great potential to be used as a precursor for the synthesis of wide diverse dihydropyrimidine-like derivatives. In this research, the title compounds were synthesized through the reaction between 5-acetyl-4-(2,5-dimethoxyphenyl)-6-methyl-3,4-dihydropyrimidin-2(1H)-thione and 2,5-dimethoxybenzladehyde under aldol condensation condition. The title compound, (E)-3-(2,5-dimethoxyphenyl)-1-{[(4-(2,5-dimethoxyphenyl)-6-((E)-2,5-dimethoxystyryl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-5-yl)]}prop-2-en-1-one (yield 15%), was obtained as major product, whereas (E)-3-(2,5-dimethoxyphenyl)-1-{[(4-(2,5-dimethoxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydro pyrimidin-5-yl)]}prop-2-en-1-one (yield 8%) as side product through vinylogous aldol condensation.

APA, Harvard, Vancouver, ISO, and other styles

47

Huang, Yan Kai, Qi Lin Mei, Zhi Xiong Huang, Yan Qin, and Di Zhu. "Synthesis of Diamine Containing Chalcone Structure by Nitroammoniation and Aldol Condensation." Key Engineering Materials 801 (May 2019): 145–50. http://dx.doi.org/10.4028/www.scientific.net/kem.801.145.

Full text

Abstract:

In this paper, the structure of the photosensitive diamines was designed and the method of synthesizing such diamines was investigated. The 1-(3-aminophenyl)-3-(4-aminophenyl)-2-propen-1-one analyzed by elemental analysis and infrared analysis was synthesized through two-step experiments with Aldol condensation and Nitroammoniation process. Through the experiment the optimum reaction conditions are raw material ratio of 1:1, anhydrous ethanol dosage of 60 ml, 10 % NaOH dosage of 10 ml and reaction temperature of 25°C for 4h. The yield was about 55.4 %.

APA, Harvard, Vancouver, ISO, and other styles

48

Wu, Qi-Long, Man-Xiu Nie, Qian Liu, Jian Rui Feng, Jian-Wei Ren, Jiong-Peng Zhao, and Fu-Chen Liu. "Gas–solid aldol condensation reaction in confined space of metal organic framework for formaldehyde detection." Nanoscale 10, no. 41 (2018): 19286–89. http://dx.doi.org/10.1039/c8nr05785k.

Full text

Abstract:

In the gas–solid nanoreactor Tb(acac)₃(H₂O)₂@ZIF-8, fluoresce of Tb^III was quenched for the aldol condensation reaction of the acac ligands and HCHO gas. Thus the nanoreactor could serve as an efficient HCHO gas probe.

APA, Harvard, Vancouver, ISO, and other styles

49

Mozaceanu, Cristina, Christopher G. P. Taylor, Jerico R. Piper, Stephen P. Argent, and Michael D. Ward. "Catalysis of an Aldol Condensation Using a Coordination Cage." Chemistry 2, no. 1 (January 25, 2020): 22–32. http://dx.doi.org/10.3390/chemistry2010004.

Full text

Abstract:

The aldol condensation of indane-1,3-dione (ID) to give ‘bindone’ in water is catalysed by an M8L12 cubic coordination cage (Hw). The absolute rate of reaction is slow under weakly acidic conditions (pH 3–4), but in the absence of a catalyst it is undetectable. In water, the binding constant of ID in the cavity of Hw is ca. 2.4 (±1.2) × 103 M−1, giving a ∆G for the binding of −19.3 (±1.2) kJ mol−1. The crystal structure of the complex revealed the presence of two molecules of the guest ID stacked inside the cavity, giving a packing coefficient of 74% as well as another molecule hydrogen-bonded to the cage’s exterior surface. We suggest that the catalysis occurs due to the stabilisation of the enolate anion of ID by the 16+ surface of the cage, which also attracts molecules of neutral ID to the surface because of its hydrophobicity. The cage, therefore, brings together neutral ID and its enolate anion via two different interactions to catalyse the reaction, which—as the control experiments show—occurs at the exterior surface of the cage and not inside the cage cavity.

APA, Harvard, Vancouver, ISO, and other styles

50

Asadipour, Ali, Saeedeh Noushini, Setareh Moghimi, Mohammad Mahdavi, Hamid Nadri, Alireza Moradi, Shabnam Shabani, Loghman Firoozpour, and Alireza Foroumadi. "Synthesis and biological evaluation of chalcone-triazole hybrid derivatives as 15-LOX inhibitors." Zeitschrift für Naturforschung B 73, no. 2 (February 23, 2018): 77–83. http://dx.doi.org/10.1515/znb-2017-0115.

Full text

Abstract:

AbstractAn efficient aldol condensation/click reaction sequence is employed for the synthesis of chalcone-triazole-based derivatives in moderate to good yields. The ability of target compounds to inhibit 15-lipoxygenase enzyme was investigated and moderate to low inhibitory activities were observed for the synthesized compounds.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!