Results 21 to 30 of about 363,660 (280)
Substituent effects on non-covalent interactions [PDF]
, 2020 Non-covalent interactions play a vital role in biological and chemical systems, underpinning important processes such as ligand–receptor binding and protein structure.
Burns, Rebecca Jayne
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Kinetics of the reaction of 5-substituted orotic acids with diazodiphenylmethane [PDF]
Journal of the Serbian Chemical Society, 2004 Rate konstants for the reaction of eight 5-substituted orotic acids with diazodiphenylmethane (DDM) in dimethylformamide (DMF) were determined at 30 ºC by the known spectrophotometricmethod.
Jovanović Bratislav Ž. +2 more
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Excited state substituent constants: to Hammett or not? [PDF]
Structural Chemistry, 2011 In this study, an answer has been sought to several questions: Can substituents’ impact on the electronic properties of molecules in the excited singlet states be summed up by a set of substituent constants? Are the well known, ground state Hammett σ constants practical for this purpose? To answer these questions, the potentials and charges on atoms of
Sadlej-Sosnowska, Nina, Kijak, Michał
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Structure-acidity-IR spectra correlations for p-substituted N-phenylsulfonylbenzamides [PDF]
, 2004 The wavenumbers of the IR absorption bands of the C=O, S=O and N-H stretching vibrations for a series of p-substituted N-phenylsulfonylbenzamides were measured in trichloromethane.
Pařík, Patrik +5 more
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Journal of Saudi Chemical Society, 2014 Thirteen optically active (αS,βR) 1-naphthyl keto-oxiranes (1-naphthyl-4-yl[3-(substituted phenyl)oxiran-2-yl]methanones) have been synthesised by phase transfer catalysed epoxidation of 1-naphthyl chalcones. The yields of oxiranes are more than 95%. The
G. Thirunarayanan
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New description of the substituent effect on electronic spectra by means of substituent constants
Journal of Molecular Structure: THEOCHEM, 1991 著者らは近年,電子スペクトルに対する置換基効果を置換基定数で記述する新しい方法を研究してきた。電子スペクトルで測定される一重項あるいは三重項遷移エネルギー(1.3Euv)は, Swain らの FR 置換基定数あるいは湯川らの置換基定数 (σi ,σπ+,σπ-)を用いて, 1.3EUV=aF+bR+C, 1,3EUV=ασi+βσπ++γσπ-+Cと記述された。そして,これらは共役系の n-π* 吸収帯を初め,共役系および脂肪族系の n-π* 吸収帯,分子内電荷移動吸収帯,分子化合物の分子間電荷移動吸収帯およびそれら錯体形成による成分化合物自身の吸収帯などに対する置換基効果に適用できる一般式であることを明らかにした。さらに,ベンゼン置換体の吸収帯を用いて,これらの式の適用限界を議論した ...
Bunji UNO, Tanekazu KUBOTA
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Reactivity of plasmalogens: kinetics of acid-catalyzed hydrolysis
Journal of Lipid Research, 1969 The acid-catalyzed hydrolysis of the α,β-unsaturated ether group of two plasmalogens, lysophosphatidal choline and lysophosphatidal ethanolamine, and several model compounds (isobutyl vinyl ether, 1-butenyl ethyl ether, and dihydropyran) was studied by ...
Michael F. Frosolono, Maurice M. Rapport
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cis‐Carboxylate Enhancement of Mn(III)‐OH Hydrogen Atom Abstraction through PCET Thermodynamics [PDF]
Advanced scienceABSTRACT Manganese(III)‐hydroxo intermediates are proposed as key hydrogen atom abstraction (HAA) species in manganese‐dependent enzymes, yet how first‐sphere carboxylate ligands control their proton‐coupled electron transfer (PCET) thermodynamics remains poorly understood.
Lee Y, Sim Y, An S, Cho K, Cho J.
europepmc +2 more sources
Substituted 2-Phenacylbenzoxazole Difluoroboranes: Synthesis, Structure and Properties
Molecules, 2020 Novel fluorescent dyes such as benzoxazole-boron complexes, bearing β-ketoiminate ligands, have been synthesized and characterized with a focus on the influence of a substituent on the basic photophysical properties.
Agnieszka Skotnicka, Przemysław Czeleń
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Molecules, 2022 The application of DFT computational method (B3LYP/6-311++G(d,p)) to mono- and poly(CF3)substituted naphthalene derivatives helps to study changes in the electronic properties of these compounds under the influence of 11 substituents (-Br, -CF3, -CH3 ...
Adam Sokół +3 more
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