ChemInform Abstract: (E)‐o‐Stilbenecarboxylic Acid and Its p‐Methyl, ‐Chloro and ‐Methoxy Derivatives.

Abstract

structure structure (organic substances) K 9000 -037(E)-o-Stilbenecarboxylic Acid and Its p-Methyl, -Chloro and -Methoxy Derivatives. -The crystal structures of title compounds (I) are determined. Bromination of carboxylic acid (Ia) in solution gives isocoumarin (IIa) as major product, whereas in solid state dibromo compound (IIIa) is generated selectively. Bromination of derivatives (Ib) and (Ic) in solid state gives only dibromo compounds (IIIb) and (IIIc), resp., but derivative (Id) gives mainly isocoumarin (IId). -(HAMAZAKI, H.; OHBA, S.; TODA, F.; TAKUMI, H.; Acta Crystallogr.