(XantPhos)AgBr as a cheap and readily available catalyst for the bromofluorocyclopropanation of electron-rich alkenes

A silver phosphine complex (XantPhos)AgBr proved to be a cheap and readily accessible catalyst for bromofluoro- cyclopropanation of electron-rich alkenes with CFBr₂CO₂Na. Ozonolysis followed by treatment with NaHSO₃ was shown to be an effective protocol to purify gem-bromofluoro- cyclopropanes from unreacted alkene precursors.