Recyclable indium catalysts for additions of 1,3-dicarbonyl compounds to unactivated alkynes affected by structure and acid strength of solid supports†
Abstract
Indium has received much attention as a widely used rare metal, which has led to its consumption and cost increasing dramatically. Development of economical and ecological procedures for indium recycling is highly desired in all fields consuming indium. Here, we propose that indium species can be immobilized on solid acids by ion exchange, which increases their activity and enables the generation of the first recyclable heterogeneous indium