One-pot synthesis of dialkyldifluoromethane and alkyldifluoromethyl iodides from the reaction of difluorodiiodomethane with alkenes in sulphinatodehalogenation systems
作者:An-Rong Li、Qing-Yun Chen
DOI:10.1016/s0022-1139(96)03545-2
日期:1997.5
The reaction of difluorodiiodomethane (CF2I2) with alkenes (RCH=CH2), initiated by Na2S2O4/NaHCO3, is described. W is carried out at low temperature (5–8 °C), the monoadducts RCHICH2CF2I are produced, whereas at 20 °C bis-adducts (RCH2CH2)CF2 are the only products. The results are rationalized in terms of a single electron transfer mechanism.
描述了由Na 2 S 2 O 4 / NaHCO 3引发的二氟二碘甲烷(CF 2 I 2)与烯烃(RCH = CH 2)的反应。W在低温(5–8°C)下进行,生成了单加合物RCHICH 2 CF 2 I,而在20°C下,双加合物(RCH 2 CH 2)CF 2是唯一的产物。根据单一的电子转移机理对结果进行了合理化。
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.