Crystal engineering via Cl ⋯ Cl non-bonded interactions. The novel 2 : 1 complex, 6-chloro-3,4-(methylenedioxy)cinnamic acid–2,4-dichlorocinnamic acid. Topochemical conversion into an unsymmetrical cyclobutane and kinetics of the reaction
Abstract
Two chloro-subsitituted cinnamic acids have been induced to co-crystallise as a molecular complex which is converted, at different rates, into an unsymmetrical and two symmetrical cyclobutanes during solid-state topochemical 2 + 2 photoaddition.