New Deconjugation Reaction of (E)‐1‐Indanylidene Methylarene Brought by Photolysis with Protic Acid.

Abstract

New Deconjugation Reaction of (E)-1-Indanylidene Methylarene Brought by Photolysis with Protic Acid. -Photolysis of title compounds (I) in the presence of HCl results in a high-yielding conversion to indans (II). When compound (Ia) is irradiated in the absence of acid, the (Z)-isomer is obtained as the lone product. -(HO*, T.-I.; LI, T.-C.; Tetrahedron Lett. 45 (2004) 29, 5665-5667; Dep. Chem., Natl. Taiwan Univ., Taipei 106, Taiwan; Eng.) -Mais 44-111