title: 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) cycloaddition cascade of sulfonyl azides and terminal alkynes is described. In addition, these cyclobutenes display a unique aggregation-induced emission enhancement (AIEE), reported for the first time, arising predominantly from restricted rotation in C=N photoisomerization in the solid state.
authors.affiliation: School of Chemistry, Madurai Kamaraj University, Madurai-625021, India.
authors.forename: Kayambu
authors.initials: K
authors.lastname: Namitharan
authors.forename: Kasi
authors.initials: K
authors.lastname: Pitchumani