ChemInform Abstract: Intramolecular Reactions of 1,5‐Diaryl‐1,5‐pentadiyl Radicals.

Abstract

ChemInform Abstract The two stereoisomers cis-and trans-(VI) are formed in equal amounts. There hence exists a 1:1 equilibrium between the two conformers of diradical (V); the intramolecular combination step itself is not stereoselective. However, the product ratios of (VI):(VII), i.e. combination : disproportionation, depend on the substituents. This regioselectivity is strongly affected by temp. and solvent.