Bio-based sustainable heterogeneous catalyst for ipso-hydroxylation of arylboronic acid

An effective and greener methodology has been developed for the ipso-hydroxylation of arylbomnic acids utilising a heterogeneous agro-waste based catalyst Calcined Burnt Peel Ash (CBPA). The catalyst CBPA has been prepared from the peel of Musa balbisiana Colla. The protocol is efficient for different electronically diverse phenylboronic acid moieties under ambient conditions with green oxidant 30% hydrogen peroxide and provides excellent yields of phenols within short reaction time. The catalyst is recyclable up to 5th cycle without significant loss of catalytic activity.