Synthesis, Structures, and Reactivities of Guanidinatozinc Complexes and Their Catalytic Behavior in the Tishchenko Reaction

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• 作者：Jie Li ; Jingchao Shi ; Hongfei Han ; Zhiqiang Guo ; Hongbo Tong ; Xuehong Wei ; Diansheng Liu ; Michael F. Lappert
• 刊名：Organometallics
• 出版年：2013
• 出版时间：July 8, 2013
• 年：2013
• 卷：32
• 期：13
• 页码：3721-3727
• 全文大小：390K
• 年卷期：v.32,no.13(July 8, 2013)
• ISSN：1520-6041

文摘

Treatment of a secondary amine (pipH, Bz₂NH, Et₂NH) with sequentially diethylzinc and N,N鈥?dicyclohexylcarbodiimide in hexane has afforded in good yield the new crystalline guanidinatozinc complexes. Each has been X-ray and solution NMR spectrally characterized. Three are dimeric (mono)guandinatozinc alkyls, two are dinuclear (tris)guanidinatozinc amides, and one is a homoleptic zinc bis(guanidinate). The reactions of dinuclear (tris)guanidinatozinc amides with diethylzinc and N,N鈥?dicyclohexylcarbodiimide in the molar ratios of 1:2:1 led to the dimeric (mono)guandinatozinc alkyls; homoleptic zinc bis(guanidinate) with an equimolar portion of diethylzinc also yielded dimeric (mono)guandinatozinc alkyls. Each of the complexes exhibited good to excellent catalytic activity for the solvent-free Tishchenko reaction under mild conditions.