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...
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 ...
The second acidity constant was determined by vector analysis and by the excess acidity function, since the acid strength provided by perchloric acid is insufficient for complete protonation. Different acidity functions and the ortho substituent effect on ionization of the amide group are compared. ...
(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,...
In general, the excellent solubility of these PEAs can be attributed to the effect of the bulky –CF3 and naphthyl groups and the ortho-linked structure, which could inhibit close packing and reduced the interchain interactions to enhance solubility. The presence of flexible linkages (ether and ...
IFRA Critical Effect: Dermal sensitization IFRA: View Standard View IFRA Standards Library for complete information. Please review Amendment 49 IFRA documentation for complete information. IFRA RESTRICTION LIMITS IN THE FINISHED PRODUCT (%): Category 1: Products applied to the lips 0.085 % Category 2...
It also has better sealing ability than zinc oxide eugenol (ZOE), amalgam, intermediate restorative material (IRM), and super-ethyoxybenzoic acid (EBA). Its biocompatibility is equal or superior to that of amalgam, IRM, and ZOE. ... None - 《Dental Abstracts》 被引量: 1发表: 2007年 Mar...
3.Syntheses and Luminescence Properties of Rare-erath Complexes with Subsituted Benzoic Acid对位取代苯甲酸稀土配合物的合成及其荧光性质研究 4.The Explanation of Substitution of Reaction s Fixed Position Rule of the Benzene Cyclie by HMO Method;HMO法对苯环上取代定位法则的解释 5.Effect of Meso-Substit...