1,3-Bis(N,N-dialkylamino)imidazolin-2-ylidenes: Synthesis and Reactivity of a New Family of Stable N-Heterocyclic Carbenes

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• 作者：Manuel Alcarazo ; Stephen J. Roseblade ; Emma Alonso ; Rosario Ferná ; ndez ; Eleuterio Alvarez ; Fernando J. Lahoz ; and José ; M. Lassaletta
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：October 20, 2004
• 年：2004
• 卷：126
• 期：41
• 页码：13242 - 13243
• 全文大小：112K
• 年卷期：v.126,no.41(October 20, 2004)
• ISSN：1520-5126

文摘

The synthesis of stable 1,3-bis(N,N-dialkylamino)imidazolin-2-ylidenes was accomplished from readily available chiral bis-hydrazones after reduction or addition of PhMgCl, cyclization to imidazolinium salts, and treatment with KN(SiMe₃)₂. This strategy allows the obtention of free imidazolin-2-ylidenes and their Rh(COD)Cl complexes in enantiomerically pure form. The -donor ability of dialkylamino-substituted diaminocarbenes was found to be slightly higher than that of alkyl(aryl) analogues.