作者:James J. Kiddle、Ashley A. Davis、Jennifer J. Rosén
DOI:10.1080/10426509908546336
日期:1999.1.1
Condensation of several representative aldehydes with the anion derived from tetrakis(2,2,2-trifluoroethyl) methylenediphosphonate, a new Wadsworth-Emmons reagent, afforded (Z)-vinyl phosphonates in good yields. The latter, when treated with a catalytic amount of potassium tert-butoxide in DMSO isomerized to the corresponding (E)-allylic phosphonates, which produce E,Z-dienes when reacted with a second
几种代表性醛与衍生自四(2,2,2-三氟乙基)亚甲基二膦酸酯(一种新的 Wadsworth-Emmons 试剂)的阴离子缩合,以良好的产率得到 (Z)-乙烯基膦酸酯。后者,当用 DMSO 中的催化量的叔丁醇钾处理时,异构化为相应的 (E)-烯丙基膦酸酯,当与第二个醛反应时产生 E,Z-二烯。