Condensation chlorure d'acide-organomagnesien en presence d'halogenure cuivreux: Competition des reactions heterolytique et homolytique. synthese de cetones aliphatiques ramifiees
作者:J.E. Dubois、M. Boussu
DOI:10.1016/0040-4020(73)80220-0
日期:1973.1
hindered acid chlorides RCOCl towards ethylmagnesium bromide in the presence of cuprous chloride has been studied. In addition to the ketones RCOEt, the compounds RCOCOR, RCOR, RR, RH and R(H) are produced by a radical reaction. The condensation of R′MgX with iPr2CHCOCl in the presence of cuprous halide proceeds via alkylcopper species R′Cu.MgXX′ which reacts with the acid chloride to produce the
研究了在氯化亚铜存在下七种位阻酰基氯RCOCl对乙基溴化镁的反应性。除酮RCOEt外,还通过自由基反应生成化合物RCOCOR,RCOR,RR,RH和R(= H)。在卤化亚铜存在下,R'MgX与iPr 2 CHCOCl的缩合反应通过烷基铜物质R'Cu.MgXX'与酰氯反应生成酮RCOR'。自由基过程是通过烷基铜中间体的分解而引发的。研究了在最佳酮化条件下温度,溶剂和结构对烷基铜稳定性的影响。通过合成9种受阻酮iPr 2 CHCOR'可以具体证明这一点,其中Me⩽R'⩽Et 3C和Tr。