Cyclodimerization and cyclotrimerization of isocyanates promoted by one praseodymium benzenethiolate complex [Pr (SPh) 3 (THF) 3]
HM Wang, HX Li, XY Yu, ZG Ren, JP Lang
Index: Wang, He-Ming; Li, Hong-Xi; Yu, Xiang-Yang; Ren, Zhi-Gang; Lang, Jian-Ping Tetrahedron, 2011 , vol. 67, # 8 p. 1530 - 1535
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Citation Number: 15
Abstract
The cyclotrimerization of aryl isocyanates and the cyclodimerization of alkyl isocyanates initiated by one praseodymium benzenethiolate complex [Pr (SPh) 3 (THF) 3] were investigated. Comparative runs with [Pr (SPh) 3 (THF) 3] and its precursor Pr [(Me3Si) 2N] 3 showed that the former has the advantages of a higher selectivity toward isocyanates, easy preparation, low catalyst loading, high conversion as well as mild reaction conditions.
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