A reaction scheme is proposed to Scope of the novel alkylation reactions was studied and give t-butyl isocyanide cuprous complexes,[(CHa) aCNC] sCuX and (CH8) aCNC. CuCN. can be liberated from the cuprous complexes by aqueous potassium cyanide. explain the formation of these cuprous complexes. physical properties of a number of new t-alkyl isocyanides thus obtained were recorded.