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;
Posner
Chemische Berichte, 1901 , vol. 34, p. 3985
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Bouveault
Bulletin de la Societe Chimique de France, 1898 , vol. <3> 19, p. 78