Diradical ring closing reactions displaying Woodward–Hoffmann behaviour and torquoselectivity

Abstract

The symmetry rules enunciated in 1965 by Woodward and Hoffmann govern pericyclic reactions. They have been successfully applied to a wealth of concerted reactions showing exceptional predictive power and control. In this communication, we present evidence of reminiscent orbital control, analogue to that described by Woodward–Hoffmann (WH), dictating the course of diradical reactions. In this regard, the frontiers of application of these symmetry rules may be broader than what is commonly recognized.