Cross-coupling of metal alkyls with haloalkenes provides general and convenient method of preparing olefins. Among several organometallics already surveyed, organocopper reagents are the most powerful tool.'Additionally, Grignard or organozinc reagents with the assistance of transition metal catalysts have alternative values. 2 The scope of their power is somewhat limited to iodo-and bromoalkenes, and cross-coupling with chloroalkenes is ...
