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Lanthanide(III) 4,6-Dimethylpyrimidine-2-thionate Complexes as Efficient Catalysts for Isocyanate Cyclodimerization.
- Source :
-
Organometallics . Jan2011, Vol. 30 Issue 2, p208-214. 7p. - Publication Year :
- 2011
-
Abstract
- Protonolysis reactions of [(Me3Si)2N]3Ln(μ-Cl)Li(THF)3(Ln = Pr, Nd, Sm, Eu) with 3 equiv of 4,6-dimethylpyrimidine-2-thiol (dmpymtH) gave rise to the four Ln(III) pyrimidine-2-thionate complexes Li[Ln(dmpymt)4] (Ln = Pr (1), Nd (2), Sm (3), Eu (4)). Compounds 1−4were characterized by elemental analysis, IR and 1H NMR spectroscopy, and single-crystal X-ray diffraction. X-ray diffraction analysis shows that the structures of 1−4are similar and each eight-coordinate Ln(III) ion is chelated by four dmpymt ligands. Complexes 1−4display excellent catalytic performance in the cyclodimerization of isocyanates to produce substituted ureas via elimination of CO, which represents the first example of lanthanide thiolates exhibiting a high catalytic activity and a high selectivity in the cyclodimerization of isocyanates. The effects of the solvents, temperatures, catalyst loadings, and rare-earth metals on the catalytic activities of the complexes were examined. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02767333
- Volume :
- 30
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Organometallics
- Publication Type :
- Academic Journal
- Accession number :
- 57543125
- Full Text :
- https://doi.org/10.1021/om100671s