Abstract
Ion exchanged zeolites are efficient heterogeneous catalysts for the intramolecular addition of an amine H-NR2 to a CC triple bond. This was shown for the cyclisation of 6-aminohex-1-yne to 2-methy1-1,2-dehydropiperidine. For this reaction rhodium(I)-, copper(I)-, or zinc(II)-exchanged BEA were the most active catalysts. The heterogeneous catalysts were more active than the corresponding homogeneous catalysts, which is concluded to be related to co-catalysis by the protons present in the zeolite.
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