When heated in the presence of Bu4N+.X- (X = F, Cl), 1-chloro-1-fluoro-2-(trimethylsilyl)methylcyclopropanes I (R = H, Me; R1 = Me, Et) undergo smooth ring-opening fragmentation to give 2-fluorobutadienes RCH:CFCR1:CH2 with high yields. Despite unfavorable ...
1984