Heterobimetallic dianionic guanidinate complexes of lanthanide and lithium: highly efficient precatalyst for addition of amines to carbodiimides

ZHANG Xingmin; WANG Chuanyong; SHEN Qi

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Heterobimetallic dianionic guanidinate complexes of lanthanide and lithium: highly efficient precatalyst for addition of amines to carbodiimides

ZHANG Xingmin 1 #,WANG Chuanyong 2,SHEN Qi 2 *

1.College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University

2.College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University, Suzhou , 215123

*Correspondence author

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Funding: We are grateful to Specialized Research Fund for the Doctoral Program of Higher Education （No.200802850003）

Opened online: 6 July 2011

Accepted by: none

Citation: ZHANG Xingmin,WANG Chuanyong,SHEN Qi.Heterobimetallic dianionic guanidinate complexes of lanthanide and lithium: highly efficient precatalyst for addition of amines to carbodiimides[OL]. [ 6 July 2011] http://en.paper.edu.cn/en_releasepaper/content/4433767

A series of heterobimetallic dianionic guanidinate complexes of lanthanide and lithium, [Li(THF)(DME)]3Ln[μ-η2η1(iPrN)2C(NC6H4p-R)]3 [R = Cl, Ln = Nd (I), Y (II), La (III); R = H, Ln = Nd (IV)] were synthesized and fully characterized. These complexes were found to be highly efficient precatalysts for the addition of various primary and secondary amines, and aromatic and aliphatic diamines to carbodiimides to the corresponding monoguanidine and biguanidine derivatives under mild condition (at 25-40 oC), which provides an efficient way for the synthesis of biguanidines compounds. The activity depends on the central metals and ligands: La > Nd > Y for metals and [(iPrN)2C(NC6H4p-Cl)]2- > [(iPrN)2C(NC6H5)]2- for ligands around lanthanide ion were observed.

Keywords:heterobimetallic complexes; catalysis; addition; guanidines

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