Helvetica Chimica Acta p. 215 - 223 (1981)
Update date:2022-08-04
Topics:
Murato, Kazuo
Wolf, Hans Richard
Jeger, Oskar
On 1?,?*-excitation (λ=254 nm) in acetonitrile (E/Z)-2 is converted into the isomers 4-9 and undergoes fragmentation yielding 10; in methanol (E/Z)-2 gives 7-10 and is transformed into 11 by incorporation of the solvent. On 1?,?*-excitation (λ>347 nm; benzene-d6) (E)-2 is isomerized into (Z)-2, which is converted into the isomers 3 and further 4 by further irradiation. 1?,?*-Excitation (λ=254 nm; acetonitrile) of 4 gives 6 and (E)-9, whereas UV.-irradiation (λ=254 nm; acetonitrile-d3) of 5 yields (E)-7 and 8. On 1?,?*-excitation (λ=254 nm; acetonitrile) of (E/Z)-12 the compounds (E)-14 and (E)-15 are obtained.
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