Types of reactions performed
1,4 addition [ mainly yahi deta hai ]
Substitution
1,2 addition [ on alpha beta unsaturated acyl chloride]
R2Culi is hard or soft
Soft
All reagents of copper
R2CuLi
RCu(CN)Li
R2Cu(CN)Li
Transmetallation
Organo zinc + CuCN.2LiCl= organo copper
RMgX+ CuI = organo copper
Gillman reaction can undergo further alkylation via enolate form during 1,4 addition and stereo of both are different means Trans
Gilman order of reaction
1,4 > substitution >1,2 [except]