n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran T=25°C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran T=25°C; Yield given. Yields of byproduct given. Title compound not separated from byproducts;