Reassignment of configurations for 5-bromo-2,3-dioxabicyclo[2.2.1]heptanes and its mechanistic implications
作者:A.J. Bloodworth、H.J. Eggelte
DOI:10.1016/0040-4039(81)80179-7
日期:1981.1
The configuration of the 5-bromo-2,3-dioxabicyclo[2.2.1]heptane obtained by treating 3,4-dibromocyclopentyl hydroperoxide with AgO2CCF3 and that of the isomer obtained using Ag2O have been reassigned after identifying which 4-bromocyclopentane-1,3-diol is obtained from each upon catalytic hydrogenation. This implies a bromonium ion mechanism for the AgO2CCF3-induced dioxabicyclization in contrast to
在确定了其中的4个之后,已经重新分配了用AgO 2 CCF 3处理3,4-二溴环戊基氢过氧化物获得的5-溴-2,3-二氧杂双环[2.2.1]庚烷的构型和使用Ag 2 O获得的异构体的构型。在催化氢化时,从各自获得-溴环戊烷-1,3-二醇。这暗示了AgO 2 CCF 3诱导的二氧杂双环化的溴离子机理,与相关化合物的S N 2型位移相反。