Liu Diansheng
2004
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Journal
Journal of Shanxi University
Abstract
Compound 2 (1R,2R)-(-)-1,2-bis(trimethylsilylamino)-cyclohexane was prepared by reaction of parent chiral 1,2-Diaminocyclohexane (DACH) with chlorotrimethylsilane.Treatment of 2 with one equiv.of n-butyllithium and dichlorodimethylsilane gave a novel organic compound dimethylsilyl [(1R,2R)-(-)(-1),2-bis(trimethylsilylamino)-cyclohexane]4.The compound 4 was characterized by ()~1H NMR, ()~(13)C NMR and MS spectra.Treatment of 2 with two equiv.of n-butyllithium and dimethylcyanamide in hexane obtained a crystalline product (1R,2R)-(-)-1-{N-(trimethylsilyl)-(N,N-dimethylamino)amidino-N'-}-2-{N-[N,N-dimethyl-N'-(trimethylsily)formamidino]-(N,N-dimethylamino)amidino-N'-}-dilithium-cyclohexane 6.The result suggested that the compound 4 was a new annular and the structure of 6 was an unusual bridged amidinate-dicyanamide compound.The possible mechanisms of reaction were suggested.