Photochemical reactions. 137th communication. Preparation and photolysis of (E/Z)-7-methyl-?-ionone
作者:Keitaro Ishii、Peter Mathies、Takehiko Nishio、Hans Richard Wolf、Bruno Frei、Oskar Jeger
DOI:10.1002/hlca.19840670502
日期:1984.8.8
The title compounds (E/Z)-7 were prepared in 66% overall yield by reaction of β-ionone ((E)-(1) with lithium dimethylcuprate, trapping of the intermediate enolate with benzeneselenenyl bromide and oxidation with H2O2. Analogously, (E/Z)-7-methyl-α-inone ((E/Z)-12) was obtained in 65% yield from α-ionone ((E)-11). 1n, π*- Excitation (λ > 347 nm, pentane) of (E)-7 causes rapid (E/Z)-isomerization and subsequent