作者:Josef Becker、Josef Ehrenfreund、Oskar Jeger、G�nther Ohloff、Hans Richard Wolf
DOI:10.1002/hlca.19740570847
日期:——
UV.-irradiation of iso-methyl-α, (E)-ionone (4) in neutral solvents yields iso-methyl-α, (Z)-ionone (5), the bicyclic ether 6 and the epoxide 7 by a sequence of successive photoisomerizations. The steps leading to des-methyl homologues of 6 and 7 do not occur on irradiation of α, (E)-ionone (1) [10]. The reversible isomerization 4 ⇄ 5 is followed by the irreversible photoprocess 5 6 and the final transformation