Abstract
We show that the 2-phosphaethynolate anion, OCP−, is a simple and efficient catalyst for the cyclotrimerization of isocyanates. This process proceeds step-wise and involves five-membered heterocycles, namely 1,4,2-diazaphospholidine-3,5-dionide anions and spiro-phosphoranides as detectable intermediates, both of which were also found to be involved in the catalytic conversion. These species can be considered as adducts of a phosphide anion with two and four isocyanate molecules, respectively, demonstrating that the OCP− anion acts as a formal “P−” source. The interconversion between these anionic species was found to be reversible, allowing them to serve as reservoirs for unique phosphorus-based living-catalysts for isocyanate trimerization.
Original language | English |
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Pages (from-to) | 1017-4024 |
Number of pages | 8 |
Journal | Chemical Science |
Volume | 6 |
Issue number | 7 |
Early online date | 13 May 2015 |
DOIs | |
Publication status | Published - 1 Jul 2015 |