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[(Me 3Si) 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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