Heterobimetallic Dinuclear Lanthanide Alkoxide Complexes as Acid鈥揃ase Difunctional Catalysts for Transesterification

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• 作者：Ruijie Zeng ; Hongting Sheng ; Yongcang Zhang ; Yan Feng ; Zhi Chen ; Junfeng Wang ; Man Chen ; Manzhou Zhu ; Qingxiang Guo
• 刊名：Journal of Organic Chemistry
• 出版年：2014
• 出版时间：October 3, 2014
• 年：2014
• 卷：79
• 期：19
• 页码：9246-9252
• 全文大小：495K
• ISSN：1520-6904

文摘

A practical lanthanide(III)-catalyzed transesterification of carboxylic esters, weakly reactive carbonates, and much less-reactive ethyl silicate with primary and secondary alcohols was developed. Heterobimetallic dinuclear lanthanide alkoxide complexes [Ln₂Na₈{(OCH₂CH₂NMe₂)}₁₂(OH)₂] (Ln = Nd (I), Sm (II), and Yb (III)) were used as highly active catalysts for this reaction. The mild reaction conditions enabled the transesterification of various substrates to proceed in good to high yield. Efficient activation of transesterification may be endowed by the above complexes as cooperative acid鈥揵ase difunctional catalysts, which is proposed to be responsible for the higher reactivity in comparison with simple acid/base catalysts.