Design of a Brønsted acid with two different acidic sites: synthesis and application of aryl phosphinic acid–phosphoric acid as a Brønsted acid catalyst†
Abstract
A Brønsted acid with two different acidic sites, aryl phosphinic acid–phosphoric acid, has been synthesized. Its catalytic performance was assessed in the hetero-Diels–Alder reaction of aldehyde hydrates with Danishefsky's diene, achieving high reaction efficiency.