Lead Tetraacetate Induced Addition Reaction of Difluorodiiodomethane to Alkenes and Alkynes. Synthesis of Fluorinated Telechelic Compounds
作者:An-Rong Li、Qing-Yun Chen
DOI:10.1055/s-1997-1378
日期:1997.12
Lead tetraacetate (LTA) can smoothly induce the addition reaction of difluorodiiodomethane (1) with electron-rich alkenes at 60°C in diglyme to give monoadducts (RCHICH2CF2I) and diadducts (RCHICH2)2. The similar, clean reaction of fluoroolefins, such as tetrafluoroethene, hexafluoropropene, with 1 occurs only in acetic acid. However, non-fluorinated β-iodo-α,β-unsaturated carboxylic esters are obtained when 1 reacts with alkynes in alcohol. The iododifluoromethyl radical generated by possible pathways from 1 with LTA is discussed.
在 60°C 的二甘醇中,四乙酸铅(LTA)可以顺利地诱导二氟二碘甲烷(1)与富电子烯烃发生加成反应,生成单加成物(RCHICH2CF2I)和二加成物(RCHICH2)2。氟烯烃(如四氟乙烯、六氟丙烯)与 1 的类似清洁反应只发生在乙酸中。然而,当 1 与炔烃在醇中反应时,会得到非氟化的 δ-碘-δ±,δ-不饱和羧酸酯。本文讨论了 1 与 LTA 通过可能的途径生成的碘氟甲基自由基。