Kinetic studies and improved reaction conditions for the halogen shift rearrangments of aryldihalopropanols
作者:Bruce L. Jensen、Scott E. Burke、Susan E. Thomas
DOI:10.1016/0040-4020(78)80194-x
日期:1978.1
Solvolytic data were obtained from the acid catalyzed trifluoroacetolysis of 1-(o-chlorophenyl)-2,2-dichloro-1-propyl trifluoroacetate (1a-TFA) and the analogous 2,2-dibromo trifluoroacetate 1b-TFA which implicate a halonium ion intermediate in the rearrangement to an α-haloketone. Employing the conditions used to achieve kinetic control, substantial increases in yield were realized for those compounds
从1-(邻氯苯基)-2,2-二氯-1-丙基三氟乙酸盐(1a -TFA)和类似的2,2-二溴三氟乙酸盐1b -TFA的酸催化三氟乙醛酸解得到溶剂数据重排成α-卤代中间体。利用用于实现动力学控制的条件,对于在硫酸中反应太快并且对浓硫酸不稳定的化合物(即1b和1c),可以实现收率的大幅提高。