Montmorillonite: a mild and efficient recyclable solid acid catalyst for detritylation of trityl tetrazole in sartan molecules

Proton and metal ion-exchanged Montmorillonite catalyzes the detritylation of trityl tetrazole in sartan molecules under mild conditions in high yields. The reactions are carried out in methanol in presence of 1 equivalents of water. Catalyst was reusable without any appreciable loss in its catalytic activity.