The reaction in which first, an alkyl halide reacts with lithium and CuI to give lithium dialkylcuprate which on further reaction with alkyl halide, gives alkane, is known as Corey-House synthesis. CH3CH2ClLi−LiClCH3CH2LiCuI(CH3CH2)2CuLiCH3CH2Cln−butaneCH3CH2CH2CH3+CH3CH2Cu+LiCl