作者:Tadeusz Zdrojewski、Andrzej Jończyk
DOI:10.1016/0040-4039(94)02476-r
日期:1995.2
13C NMR investigations revealed that salt 1a enriched in 13C at one of cyano groups, when treated with a base, generated ylides 2a+− and 3a+− which entered [2,3] and [1,4] sigmatropic rearrangements, respectively.
13 C NMR研究表明,盐1a在一个氰基上富集于13 C,当用碱处理时,生成的叶酸酯2a +-和3a +-分别进入[2,3]和[1,4]σ重排。 。