A Convenient Synthesis of Carboxanilides from Silyl Carboxylates and Weakly Nucleophilic Anilines Using<i>p</i>-Trifluoromethylbenzoic Anhydride and a Catalytic Amount of Active Titanium(IV) Salt
Various carboxanilides are prepared in excellent yields from nearly equimolar amounts of silyl carboxylates and the corresponding weakly nucleophilic anilines under mild conditions by using p-trifluoromethylbenzoic anhydride and a catalytic amount of active titanium(IV) salt.
Partition coefficients of ketones, phenols, aliphatic and aromatic acids, and esters in n-hexane/nitromethane
作者:Urszula Kotowska、Valery Isidorov
DOI:10.2478/s11532-011-0060-4
日期:2011.10.1
in sample preparation and in countercurrent and liquid-liquid chromatographic separations. Partition coefficients are widely used in toxicology, environmental, and analytical chemistry. The K hn determination procedure for the n -hexane/nitromethane system was optimized and partition coefficients for 99 ketones, esters and trimethylsilyl derivatives of phenols, aliphatic and aromaticacids were determined
液-液分配用于样品制备以及逆流和液-液色谱分离。分配系数被广泛用于毒理学,环境和分析化学中。该 ķ HN 用于确定过程 Ñ 正己烷/硝基甲烷体系进行了优化和分配系数为99酮,酯和酚的三甲基甲硅烷衍生物,测定脂族和芳族酸。对于130种化合物, 使用 K hn 与其他理化和结构参数之间的数学关系来预测 K hn 值 。
Phosphinalkylene, 51<sup>1</sup>; Synthese und Reaktionen von [1-(Trialkylsilyl)alkyliden]triphenylphosphoranen
作者:Hans Jürgen Bestmann、Andreas Bomhard、Roman Dostalek、Rainer Pichl、Roland Riemer、Reiner Zimmermann
DOI:10.1055/s-1992-26227
日期:——
Synthesis and Reactions of [1-(Trialkylsilyl)alkylidene[triphenylphosphoranes Alkylidenetriphenylphosphoranes 1 react with trialkyl halosilanes 2 to afford silylated alkylidenephosphoranes 5, which can be converted to acylated alkylidenephosphoranes 8 and 10 by trimethylsilyl carboxylates 6 or carboxylic anhydrides 10. Bis(acylalkylidenephosphoranes) 13-15 are available from 5 and bis(trimethylsilyl) dicarboxylates 12 or cyclic or polymeric anhydrides 16, 17.
ketene bis(trialkylsilyl) acetals: synthesis, pyrolysis and spectral studies
作者:C. Ainsworth、Yu-Neng Kuo
DOI:10.1016/s0022-328x(00)90476-5
日期:1972.12
methods are described for the preparation of alkyl, dialkyl, aryl and diaryl ketene bis(trialkylsilyl)acetals. One is by reaction of αmetalated trimethylsilyl carboxylates with trimethylchlorosilane (TMCS) and the otehr is by inteaction of dianions of carboxylic acids and TMCS. The dianion of cyclopropane carboxylic acid and TMCS gave C-silated ester in 90% yield. Pyrolysis of diphenyl ketene bis(trialkylsilyl)
In the presence of a catalytic amount of Lewis acid, various carboxylic esters or S-phenyl carbothioates are prepared in excellent yields by the respective reactions of equimolar amounts of silyl carboxylates and alkyl silyl ethers or phenyl silyl sulfides with 4-trifluoromethylbenzoic anhydride.