N,N,N',N',N'',N''-hexamethylphosphoric triamide; n-butyllithium; diisopropylamine 1) THF-hexane, 0 deg C, 30 min then 15 min and -78 deg C, 30 min; 2) -78 deg C, 1 hr; Yield given. Multistep reaction;

n-butyllithium 1.) THF, -50 deg C, 13 min, 2.) THF, -50 deg C, 2 h; Yield givenMultistep reaction. Yields of byproduct given;