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Exploring the Limits of π-Acid Catalysis Using Strongly Electrophilic Main Group Metal Complexes: The Case of Zinc and Aluminium |
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| Authors: | Jiaxin Tian Yan Chen Dr Marie Vayer Alexandre Djurovic Régis Guillot Dr Refka Guermazi Dr Samuel Dagorne Dr Christophe Bour Prof Vincent Gandon |
| Institution: | 1. Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405 Orsay cedex, France;2. Institut de Chimie de Strasbourg, CNRS-Université de Strasbourg, 1 rue Blaise Pascal, 67000 Strasbourg, France |
| Abstract: | The catalytic activity of cationic NHC-ZnII and NHC-AlIII (NHC=N-heterocyclic carbene) complexes in reactions that require the electrophilic activation of soft C?C π bonds has been studied. The former proved able to act as a soft π-Lewis acid in a variety of transformations. The benefit of the bulky IPr NHC ligand was demonstrated by comparison with simple ZnX2 salts. The tested NHC-AlIII catalyst is not able to activate C?C π bonds but simple AlX2+ ions were found potent in some cases. |
| Keywords: | alkynes aluminium carbonyl-ene metathesis cycloisomerization NHC ligand zinc |