Cyclodimerization and cyclotrimerization of isocyanates promoted by one praseodymium benzenethiolate complex [Pr(SPh)3(THF)3]
摘要:
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)(2)N](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. (C) 2011 Elsevier Ltd. All rights reserved.