3-Neopentylallyllithium II. Reactions in hydrocarbon media
作者:William H. Glaze、John E. Hanicak、Donald J. Berry、Don P. Duncan
DOI:10.1016/0022-328x(72)80041-x
日期:1972.10
chlorotrimethylsilane also shows no “rearranged” product. Carboxylation and ketone addition reactions, however, proceed with marked rearrangement unless the ketone is very hindered. Di-tert-butyl ketone and benzophenone give no rearranged product. Addition of a second mole of butadiene also results in predominant (60%) rearrangement of the neopentylallyl group. Bromination with molecular bromine and 1,2-dibromoethane
报道了在3-新戊基烯丙基锂的烃溶剂,叔丁基锂和1,3-丁二烯的1,4-加成产物中的几种反应的产物分布。用几种试剂进行质子分解主要产生“正常”产物[(Ia)和(Ib)],观察到的末端烯烃少于6%。所述的比率的顺式/反式异构体[(Ia)和(Ib)]与蛋白水解前锂化形式的比例平行。与氯代三甲基硅烷的反应也没有显示出“重排”产物。然而,除非酮非常受阻,否则羧基化和酮加成反应会进行明显的重排。二叔丁基酮和二苯甲酮不产生重排产物。加入第二摩尔丁二烯也导致新戊烯丙基的主要(60%)重排。用分子溴和1,2-二溴乙烷进行溴化,在前一种情况下生成二溴衍生物,在后一种情况下生成C 16-二烯烃偶联产物。讨论了蛋白酶解和加成反应的暂定机理。