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Journal articles on the topic 'Mono Halogen Derivatives'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Kaválek, Jaromír, Lubomír Kacetl, and Marcela Kaválková. "Kinetics of methanolysis of 1-(2-halogeno and 2,6-dihalogenobenzoyl)-3-(4-chlorophenyl)ureas." Collection of Czechoslovak Chemical Communications 54, no. 5 (1989): 1363–69. http://dx.doi.org/10.1135/cccc19891363.

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The methanolysis kinetics has been measured of 1-(2,6-difluorobenzoyl)-3-(4-chlorophenyl)urea (a larvicidal insecticide Dimilin) and of four other mono- and dihalogenobenzoyl derivatives. Polar and steric effects of halogen on the rate and dissociation constants is discussed.

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2

Veverka, Miroslav, and Eva Kraľovičová. "Synthesis of some biologically active derivatives of 2-hydroxymethyl-5-hydroxy-4H-pyran-4-one." Collection of Czechoslovak Chemical Communications 55, no. 3 (1990): 833–40. http://dx.doi.org/10.1135/cccc19900833.

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Depending on reaction conditions, acylation of the phenolic and primary alcoholic group in 2-hydroxymethyl-5-hydroxy-4H-pyran-4-one leads to mono- or disubstituted products. Also described is acylation of the phenolic group in 2-chloromethyl- or 2-bromomethyl-5-hydroxy-4H-pyran-4-one as well as the nucleophilic replacement of the halogen by azide group. The prepared derivatives exhibit herbicidal and growth regulatory activity.

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3

Povidaichyk, M., О. Onysko, and M. Onysko. "SYNTHESIS OF TERMINAL 2-ALKENYL(ALKYNYL)THIO-5-CYANO-6-(p-DIMETHYLAMINOPHENYL)PYRIMIDIN-4-ONES." Scientific Bulletin of the Uzhhorod University. Series «Chemistry» 48, no. 2 (2023): 79–83. http://dx.doi.org/10.24144/2414-0260.2022.2.79-83.

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Functionalized pyrimidines possess a wide spectrum of biological activity. In particular, they have antitumor, antiviral, and anticonvulsant activities, exhibit anti-inflammatory and analgesic effects, and they are inhibitors of aldose reductase, SecA ATPase, azide, and plant growth. The search for methods of synthesis of new functionalized and condensed pyrimidine derivatives is an urgent problem. Alkenyl-functionalized mono- and polycyclic pyrimidines are promise substrates for studying the regioselectivity of electroph ilic heterocyclization reactions under the influence of halogen-co

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4

McGuigan, C., S. Turner, S. R. Nicholls, T. J. O'Connor, and D. Kinchington. "Haloalkyl Phosphate Derivatives of AZT as Inhibitors of HIV: Studies in the Phosphate Region." Antiviral Chemistry and Chemotherapy 5, no. 3 (1994): 162–68. http://dx.doi.org/10.1177/095632029400500304.

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Novel haloalkyl phosphate derivatives of the anti-HIV nucleoside analogue AZT were prepared by phosphorochloridate chemistry. These materials were designed to act as labile membrane-soluble prodrugs of the bio-active free nucleotides. In vitro evaluation revealed the compounds to have a pronounced and selective antiviral action, which varied greatly with the structure of the phosphate moiety. By comparison to simple dialkyl phosphates, which are inactive against HIV-1, the introduction of halogen atoms into the alkyl (phosphate) chains led to anti-HIV activity. Although halogen substitution in

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5

Kulhánek, Jiří, Oldřich Pytela, and Antonín Lyčka. "Chemometrical Analysis of Substituent Effects. XIII. Comparison of Substituent Effects on Dissociation and Chemical Shift in 13C NMR Spectra of Mono- and Disubstituted Benzoic Acids." Collection of Czechoslovak Chemical Communications 65, no. 1 (2000): 106–16. http://dx.doi.org/10.1135/cccc20000106.

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The 13C chemical shifts have been measured of the carboxyl carbon atoms for all the 2-, 3-, and 4-substituted benzoic acids with H, CH3, CH3O, F, Cl, Br, I, and NO2 substituents, as well as for all 3,4-, 3,5-, and 2,6-disubstituted benzoic acids with combinations of CH3, CH3O, Cl (or Br), NO2 substituents and for symmetrically 2,6-disubstituted derivatives with Et, EtO, PrO, i-PrO, and BuO substituents. The chemical shifts of carboxylic group carbon atoms of the 3- and 4-substituted derivatives show correlation only with the substituent constants σI. For the 2-substituted derivatives was found

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6

Neubauer, Pia R., Olga Blifernez-Klassen, Lara Pfaff, Mohamed Ismail, Olaf Kruse, and Norbert Sewald. "Two Novel, Flavin-Dependent Halogenases from the Bacterial Consortia of Botryococcus braunii Catalyze Mono- and Dibromination." Catalysts 11, no. 4 (2021): 485. http://dx.doi.org/10.3390/catal11040485.

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Halogen substituents often lead to a profound effect on the biological activity of organic compounds. Flavin-dependent halogenases offer the possibility of regioselective halogenation at non-activated carbon atoms, while employing only halide salts and molecular oxygen. However, low enzyme activity, instability, and narrow substrate scope compromise the use of enzymatic halogenation as an economical and environmentally friendly process. To overcome these drawbacks, it is of tremendous interest to identify novel halogenases with high enzymatic activity and novel substrate scopes. Previously, Ne

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7

Holub, Josef, Mario Bakardjiev, and Bohumil Štíbr. "Some Halogenation Reactions of nido-7,8,9,11-P2C2B7H9." Collection of Czechoslovak Chemical Communications 67, no. 6 (2002): 783–90. http://dx.doi.org/10.1135/cccc20020783.

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Halogenations of the diphosphadicarbaborane nido-7,8,9,11-P2C2B7H9 using the AlCl3/CCl4, and I2/AlCl3/C6H6 halogenation systems resulted in the formation of a mixture of mono- and disubstituted derivatives 10-X-nido-7,8,9,11-P2C2B7H8 (for X = Cl and I, yields 6 and 21%, respectively) and 5,10-X2-nido-7,8,9,11-P2C2B7H7 (for X = Cl and I, yields 57 and 46%, respectively). These results show that the halogenation under electrophilic conditions takes place at positions most distant from the P atoms, but at sites adjacent to the CH units. In contrast, the bromination with N-bromosuccinimide in CH2C

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8

Abrams, Barny. "Mono-Chlorinated 3-Carboxy-7-Hydroxycoumarin: A Highly Fluorescent and Water-Soluble Violet Excitable Dye for Cell Analysis." Blood 112, no. 11 (2008): 4929. http://dx.doi.org/10.1182/blood.v112.11.4929.4929.

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Abstract In our search for new violet excitable dyes with improved photochemical properties, we examined several halogen substituted 7-hydroxycoumarins and found that chlorinated derivatives could be as bright as their fluorinated analogs. In particular, mono-chlorinated 3-carboxy-7-hydroxycoumarin (V450) has a quantum yield equal to 3-carboxy-6,8- difluoro-7-hydroxycoumarin (Pacific Blue™). Antibodies specific to various cell surface markers (CD3, CD4, CD45) were labeled with V450 and tested in single color flow cytometry assays. Our results show that conjugates of V450 are brighter than the

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9

Welchinska, Elena. "ANTI-TUMOR ACTIVITY OF BACTERIAL LECTIN AND 5-METHYLURACIL ADDUCT." CBU International Conference Proceedings 2 (July 1, 2014): 307–12. http://dx.doi.org/10.12955/cbup.v2.476.

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The synthesis was performed using 5-methyluracil mono-and bis-derivatives with the halogen-containing pharmacophore groups in the composition of molecules; their physiochemical and biological properties were studied. These reactions are a typical example of substitution reactions on heteroatom N(1) of uracil molecule using as the second component the reaction of halothane—the known inhaled anesthetic. The reactions were carried out in a solvent system: benzene-dimethyl formamide and diethyl ether, under conditions of phase transfer catalysis DB-18-crown-6-complex (alkaline medium), by heating

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10

Bray, Brian L., Petr Hess, Joseph M. Muchowski, and Markus E. Scheller. "Lithiated Azafulvenes by Halogen/Metal Interchange of Brominated 6-(Diisopropylamino)-1-azafulvene Derivatives. Novel synthesis of 5-mono- and 4,5-disubstituted 1H-pyrrole-2-carbaldehydes." Helvetica Chimica Acta 71, no. 8 (1988): 2053–57. http://dx.doi.org/10.1002/hlca.19880710823.

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11

Gray, Lilian, and Peter G. Jones. "Secondary Bonding Interactions in Some Haloanilinium Halides." Zeitschrift für Naturforschung B 57, no. 1 (2002): 61–72. http://dx.doi.org/10.1515/znb-2002-0108.

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The crystal packing in the structures of various solvent-free (mono)haloanilinium halides involves with one exception the formation of approximately planar hydrophilic regions that contain classical hydrogen bonds N-H···X- (X = halogen). Common to the substructures of all layers are rings of general graph set Rn2n(4n), involving equal numbers of chloride acceptors and NH2 moieties (two hydrogen atoms of the positively charged NH3 groups). The 2-substituted derivatives contain the shortest X···X- contacts, and these are within the layers; it could be argued that the contacts are forced upon the

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12

Tusy, Chuong, Kang Jiang, Kai Peng, Lili Huang, and Jiangbin Xia. "Effect of monomers’ structure on self-acid-assisted polycondensation for the synthesis of poly(3,4-ethylenedioxythiophene) and homopolythiophene." Polymer Chemistry 6, no. 6 (2015): 1014–22. http://dx.doi.org/10.1039/c4py01070a.

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PEDOT and homopolythiophene were synthesized by self-acid-assisted polycondensation (SAAP) based on mono-halogen substituted thiophene derivative monomers. Our results reveal that substituted halogen (bromo or iodo) positions play an important role in SAAP.

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13

Green, Malcolm L. H., Dermot O'Hare та Julian M. Wallis. "Mono-η-arenebis(trimethylphosphine(rhenium chemistry: alkyl, hydrido, halogeno and olefin derivatives". Polyhedron 5, № 8 (1986): 1363–70. http://dx.doi.org/10.1016/s0277-5387(00)83130-7.

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14

Slivka, Mikhailo, and Mikhailo Onysko. "The Use of Electrophilic Cyclization for the Preparation of Condensed Heterocycles." Synthesis 53, no. 19 (2021): 3497–512. http://dx.doi.org/10.1055/s-0040-1706036.

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AbstractCondensed heterocycles are well-known for their excellent biological effects and they are undeniably important compounds in organic chemistry. Electrophilic cyclization reactions are widely used for the synthesis of mono-heterocyclic compounds. This review highlights the utility of electrophilic cyclization reactions as an effective generic tool for the synthesis of various condensed heterocycles containing functional groups that are able to undergo further chemical transformations, such as nucleophilic substitution, elimination, re-cyclization, cleavage, etc. This review describes the

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15

Hammas, Lynda, Sabrina Touchet, Sandrine Adach, and Corinne COMOY. "Organometallic Reagents: Efficient Tools for the Synthesis of Fused Pyridinyl‐Lactones." European Journal of Organic Chemistry, September 2023. http://dx.doi.org/10.1002/ejoc.202300800.

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: Herein we disclose an efficient one‐pot route to a wide range of 3‐substituted fused pyridinyl‐lactones so called aza‐phthalides. The developed strategy involves a Metal/Halogen Exchange (MHE) reaction as key step, followed by an electrophile trapping using various carbonyl derivatives and a subsequent lactonization. To promote the MHE reaction with high chemoselectivity, our investigations have particularly focused on the nature of mono‐ or bimetallic derivatives as metalation reagents including organolithiums, Grignard reagents and lithium organomagnesiate complexes, and highlighted the po

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16

Bai, Jinrui, Bin Li, Dan Qi, Zhuoheng Song, Yue Yao та Chao Liu. "Photo-induced transformation of α-diazocarbonyl compounds into mono-substituted alpha-halogen derivatives". Organic & Biomolecular Chemistry, 2024. http://dx.doi.org/10.1039/d4ob01641f.

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17

Chamoun, Nidal, Mahmoud Hussein Deeb, Nabil Joudieh, and Habib Abboud. "Quantum Study of Halogen Substituted anti-B18H22 Borane Clusters for Optoelectronics." Physica Scripta, March 17, 2025. https://doi.org/10.1088/1402-4896/adc179.

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Abstract We offer a quantum chemical analysis of mono-halogenated borane molecules using DFT and TD-DFT theories, applying the PBE0/def2-SVPD and B3LYP/6-311+G(d) methods as implemented in ORCA, and explore how solvent effects influence electronic transition properties. &#xD;The comparable benchmarks are the archetype anti-\ce{B18H22} denoted as (1) against hypothetical halogenated derivatives: &#xD;7-F-anti-\ce{B18H21} (2), 4-F-anti-\ce{B18H21} (3), and the recently synthesized 4-Br-anti-\ce{B18H21} (4). The analysis includes an optimization of the ground and first singlet excited sta

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18

Chen, Shan, Zhimin Xu, Binbin Yuan, Xue-Ya Gou, and Lutz Ackermann. "Difunctionalization of bicyclo[1.1.0]butanes enabled by merging C−C cleavage and ruthenium-catalysed remote C−H activation." Nature Synthesis, February 17, 2025. https://doi.org/10.1038/s44160-025-00745-3.

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Abstract The high fraction of sp 3-hybridized carbon atom (Fsp 3) character of cyclobutane derivatives renders them as highly promising bioisosteres for otherwise typically flat arenes. Here, to address the current needs in medicinal chemistry for Fsp 3-rich molecules, we disclose a distinct strategy that exploits the merger of C–C scission in bicyclo[1.1.0]butanes (BCBs) with ruthenium-catalysed remote C−H functionalization of heteroarenes, affording densely substituted cyclobutanes in a chemo-controlled manner. This approach enabled the rapid and efficient synthesis of versatile tri- and tet

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19

BRAY, B. L., P. HESS, J. M. MUCHOWSKI, and M. E. SCHELLER. "ChemInform Abstract: Lithiated Azafulvenes by Halogen/Metal Interchange of Brominated 6-(Diisopropylamino)-1-azafulvene Derivatives. Novel Synthesis of 5-Mono- and 4,5-Disubstituted 1H-Pyrrole-2-carbaldehydes." ChemInform 20, no. 11 (1989). http://dx.doi.org/10.1002/chin.198911152.

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20

Maigari, Abubakar, A. B. Suleiman, A. S. Gidado, and Chifu E. Ndikilar. "Effects of Mono-Halogen-Substitution on the Electronic and Non-Linear Optical Properties of Poly(3-hexylthiophene-2,5-diyl) for Solar Cell Applications: A DFT Approach." Journal of Energy Research and Reviews, October 25, 2022, 1–14. http://dx.doi.org/10.9734/jenrr/2022/v12i4243.

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Poly(3-hexylthiophene-2,5-diyl) with the acronym P3HT and its derivatives are p-type conjugated semiconductor polymers that have been proved to be good organic semiconductors. They have several applications in many areas, such as photovoltaic systems, organic light-emitting diodes, and so on. The instability of organic molecules under ambient conditions is one factor deterring the commercialization of such organic semiconductor devices. Here we present a theoretical study using density functional theory (DFT) approach with Gaussian 09 and GaussView 5.0, to investigate the effects of halogens (

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21

"Chemo- and Regioselectivity in the Reaction of Tetrachloro- and Tetrabromophthalic Anhydrides and Imides with Thiolates." CHIMIA 45, no. 5 (1991): 162. http://dx.doi.org/10.2533/chimia.1991.162.

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The reaction of tetrachloro- and tetrabromophthalic anhydrides and -imides with in situ generated aryl and alkyl thiolates gives mono- to tetrathio-substituted derivatives depending on reagent, stoichiometry, and reaction conditions. The halogens non-vicinal to the carbonyl groups react regio- and chemoselectively under appropriate conditions. By this reaction, novel types of photosensitizers useful to photocross-link polymers are prepared.

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22

Ostrowski, Stanisław, Mariusz Rosa, and Maciej Malinowski. "Modification for Nitration of Halo-substituted meso-Tetraarylporphyrins: A Convenient Scale-up in Small Amount of Solvent." Current Organic Chemistry 27 (July 17, 2023). http://dx.doi.org/10.2174/1385272827666230717105700.

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Abstract: The synthesis of porphyrins with halogens and nitro groups in meso-aryl rings is described. Halo-substituted meso-tetraarylporphyrin derivatives in the reaction with sodium nitrite in trifluoroacetic acid at 40°C (or room temperature) afford 5-(4-nitroaryl)-10,15,20-triarylporphyrins. The above mono-nitro products bearing halogens on meso-aryl rings (F, Cl, Br) are difficult to obtain selectively. The method elaborated herein allows to synthesize them with reasonable yield (of up to 57%), and the reaction can be easily scaled-up. By this route, the preparation of valuable substrates

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23

Xu, Zhijie (Jay). "Evolution of energy, momentum, and spin parameter in dark matter flow and integral constants of motion." February 8, 2022. https://doi.org/10.48550/arXiv.2202.04054.

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Evolution of energy, momentum, and spin parameter in dark matter flow and integral constants of motion N-body equations of motion in comoving system and expanding background are reformulated in a transformed system with static background and fixed damping. The energy and momentum evolution in dark matter flow are rigorously formulated for both systems. The energy evolution in transformed system has a simple form that is identical to the damped harmonic oscillator. The cosmic energy equation can be easily derived in both systems. For entire N-body system, 1) combined with the two-body collapse

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