Table 3. Substrate scope of trifluoromethyl alkenes a .
aIsolated yield for 0.2 mmol scale reaction. Reaction conditions are the same as those for Table 1, entry 17. Ratio of desired product/addition by-product >50 : 1 unless otherwise noted.
bRatio of desired product/addition by-product = 14 : 1.
cRatio of desired product/addition by-product = 35 : 1. Bn = benzyl. Ac = acetyl.