title: Heterobimetallic dinuclear lanthanide alkoxide complexes as acid-base difunctional catalysts for transesterification.
abstract: 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-base difunctional catalysts, which is proposed to be responsible for the higher reactivity in comparison with simple acid/base catalysts.
authors.affiliation: School of Chemistry and Chemical Engineering & Key Laboratory of Environment-friendly Polymer Materials of Anhui Province, Anhui University , Hefei 230039, China.
authors.forename: Ruijie
authors.initials: R
authors.lastname: Zeng
authors.forename: Hongting
authors.initials: H
authors.lastname: Sheng
authors.forename: Yongcang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Feng
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chen
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wang
authors.forename: Man
authors.initials: M
authors.lastname: Chen
authors.forename: Manzhou
authors.initials: M
authors.lastname: Zhu
authors.forename: Qingxiang
authors.initials: Q
authors.lastname: Guo
mesh_terms: D000143:Acids / Q000737:chemistry; D002384:Catalysis; D018360:Crystallography, X-Ray; D004951:Esterification; D004952:Esters; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D015394:Molecular Structure
chemical_list: D000143:Acids; D004952:Esters; D028581:Lanthanoid Series Elements