sodium hydride in N,N,N',N',N'',N''-hexamethylphosphoric triamide
T=20°C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;
Jaiswal, Neelam; Jaiswal, R. K.; Barthwal, J. P.; Kishor, K.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1981 , vol. 20, # 3 p. 252 - 253