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Photochemische Reaktionen. 89. Mitteilung [1]. Zur Photochemie konjugierter Epoxy‐diene I. Versuche mit ( E ),β‐Jonyliden‐epoxiden
Author(s) -
Peter Alder Alex,
Richard Wolf Hans,
Jeger Oskar
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590321
Subject(s) - chemistry , epoxide , photoisomerization , ketone , pentane , stereochemistry , photodissociation , photochemistry , isomerization , organic chemistry , catalysis
Photolysis of conjugated epoxy‐dienes UV.‐irradiation (λ = 254 nm) of ( E ),β‐ionylidene‐epoxide ( 3 ) in n ‐pentane gives the isomeric cyclopropene‐ketone 7 (90%) in a hitherto unreported type of photoreaction. The methylsubstituted ( E ),β‐ionylidene‐epoxide 6 , however, undergoes ( E/Z )‐photoisomerization to the ( Z ),β‐ionylidene‐epoxide 8 (91%).