Mechanism of acid chloride decarbonylation with chlorotris(triphenylphosphine)rhodium(I). Stereochemistry and direction of elimination
作者:J. K. Stille、F. Huang、M. T. Regan
DOI:10.1021/ja00812a040
日期:1974.3
phenyl p-nitrophenyl sulfite (X), in carboxylic acid buffers were examined as simple models for the corresponding pepsin-catalyzed processes. The observation of a substantial Bronsted BETA value, 0.85, for the monocarboxylate ion-catalyzed hydrolysis of VIII, as well as the finding that the kinetic solvent isotope effect (k/sub OAc//sup H/sub 2/O//(k/sub CAc)/s up D/sub 2/O = 1.32 are consistent with
赤-和苏-2,3-二苯基丁酰氯与氯三(三苯基膦)铑(I)脱羰分别得到反式和顺式甲基芪。这些结果最好通过带有保留的酰基- - 烷基重排和顺式 BETA - 氢化物消除或集中的顺式消除来解释。dichioro(3-perdeuteriophenyl-3,3-dideuteriopropionyl)bis(triphenylphosphine) 铑 (III) 与未氘化配合物 k/sub H/ = 3.34 x 10/sup -5/ sec/sup -1 的脱羰速率/, k/ sub D/ - 4.75 x 10/sup -6/ sec/sup -1/) 显示 7.04 的初级氘 m 同位素效应。2-甲基戊酰氯、2,2-二甲基戊酰氯、2-乙基-;3-甲基丁酰氯和2,3-二甲基丁酰氯与反式-氯羰基双(三苯膦)铑(I)表明该烯烃形成反应优先于Saytzeff消除。(auth) (VIII)、双对硝基苯亚硫酸盐