The effect of the Me2S+ group on the ionization of benzoic acid has been re-examined in comparison with that of the Me3N+ group. The thermodynamic pKa values of o-, m-, p-Me2S+ and o-, m-, p-Me3N+ substituted benzoic acids have been determined in 65 vol% aq. dimethyl sulfoxide...
oxybenzoic 羟苯甲酸的 ortho acid 【化】 原酸; 正酸【医】 正酸, 原酸 ortho 原; 直 ortho 表示“直, 正直”之义 ortho antimonate 原锑酸盐 ortho arsenate 正砷酸盐 ortho axis 正交轴 ortho borate 原硼酸盐 ortho derivative 邻位衍生物 ortho effect 邻位效应 最新...
a second substituent into the 3- or 6-position of the 2-substituted benzoic acids would invert the direction of the dipole toward the point charge on the reacting group, and would therefore cause another ortho effect in a direction opposite to that of the usual acid strengthening ortho effect...
The mass spectra of o-nitrobenzoic acid, o-nitroanisole, o-nitrosobenzoic acid, o-nitrobenzamide, o-nitrobenzyl alcohol and o-nitrosobenzaldehyde have been studied. Fragmentation mechanisms are proposed for the above compounds; their elucidation was aided by isotopic labeling with D and O18. Two ...
You can also analyse this for o-methylbenzoic acid and here the effect changes direction. In benzoic acid there is already some intramolecular hydrogen bonding from the ortho hydrogens, one of these is still present in the substituted case. The distance d(O−Ho′)=226.2 pmd(O−Ho′)=...
中文: 以柱层析对孜然石油醚提取物的杀菌活性成分进行分离,从孜然种子中分离得到活性化合物Ⅰ和化合物Ⅱ,经质谱及核磁共振技术进行结构鉴定,确定其分别为枯茗醛(p-isopropyl benzaldehyde)和枯茗酸(p-isopropyl benzoic acid)。英文: Effect of m-cresol on the growth of coriolus versicolor and its laccase ...
(ascorbic acid at 20 mM and uric acid at 0.05 mM). The effect of the quenchers was studied by incubating the treated DNA (40 µg each) in 0.1 M phosphate-buffered saline, pH 7.4, with 0.1 mM EDTA at 37 °C for 1 h. Absorbance at 260 nm (A260) was recorded for each sample,...
Isomeric free radicals formed by Mu adding to o/m/p positions of benzoic acid in water were detected by LCR and the corresponding resonance positions and proton hyperfine coupling constants were obtained. There was an isotope effect of the 'second kind' for these Mu-radicals in the range of ...
ChemInform Abstract: Benzoic Acid Catalyzed Annulations of -Amino Acids and Aromatic Aldehydes Containing an ortho-Michael Acceptor: Access to 2,5-Dihydro-1H... Mi,Tang,Lingfeng,... - 《Cheminform》 被引量: 1发表: 2016年 Benzoic Acid Catalyzed Annulations of α-Amino Acids and Aromatic Aldehyd...
(Methyl-1-benzyloxyethyl MBF 2,3,3a,4,5,6,7,7a-Octahydro-7,8,8-trimethyl-4,7-methanobenzofuran- 2-yl MBS p-Methoxybenzenesulfonyl MCPBA m-Chloroperbenzoic acid Mds 2,6-Dimethyl-4-methoxybenzenesulfonyl m/e Mass to charge ratio (in MS) MEM α-Methoxyethoxymethyl MeOZ p-Methoxy...