sodium hydride 1) hexamethylphosphoric triamide, 20 deg C 2) 80 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;

sodium hydride in N,N,N',N',N'',N''-hexamethylphosphoric triamide T=20 - 80°C; 2 h; Product distribution;