Cascade synthesis of bis-N-sulfonylcyclobutenes via Cu(i)/Lewis acid-catalyzed (3 + 2)/(2 + 2) cycloadditions: observation of aggregation-induced emission enhancement from restricted C
N photoisomerization†
Abstract
A remarkable role of Lewis acid additives in syntheses of bis-N-sulfonylcyclobutenes via copper(I) catalyzed (3 + 2)/(2 + 2) N photoisomerization in the solid state.