Strongly reducing helical phenothiazines as recyclable organophotoredox catalysts

Abstract

Recyclable phenothiazine organophotoredox catalysts (PTHS 1-3, E1/2ox* = −2.34 to −2.40 V vs. SCE) have been developed. When the recycling performance was evaluated, PTHS-1 could be recovered at least four times without loss of its catalytic activity. These recyclable organophotoredox catalysts represent a promising tool for sustainable organic synthesis.