Helical Chirality and Enantiotopomerization Process of a Photochromic Furylfulgide

Abstract

Abstract A photochromic furylfulgide, (E)-2-[1-(2,5-dimethyl-3-furyl)-2-methylpropylidene]-3-isopropylidenesuccinic anhydride, was shown to be chiral. Its enantiotopomerization process was observed by variable temperature 1H NMR measurement, and ΔH≠(obs) was 52.9 ± 8.1 kJ mol−1. AM1 calculation showed ΔH≠(calc) to be 51.5 kJ mol−1.