Yang1 and Jeger' and their coworkers have observed the formation of cyclobutanols on irradiation of ketones which pos-
The photochemical synthesis of 1- and 3-acetylphenoxazines
β Scribed by Yoshio Ueno
- Publisher
- Springer Vienna
- Year
- 1982
- Tongue
- English
- Weight
- 113 KB
- Volume
- 113
- Category
- Article
- ISSN
- 0026-9247
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## Abstract The reaction of the 4,4βdialkylated 2βcyclohexenones **1** or **2** with a twofold excess of a secondary amine **3** affords the 2βaminoβ1,3βcyclohexadienes **4** and **5**, respectively. Irradiation (Ξ» β§ 300 nm) of the morpholino derivative **4a** yields a mixture of the isomeric 3βmor
Photolysis (A = 254 nm) of 4-(tert-butyl)-4,6,7,8-tetrahydro-7,7-dimethyl-2H-l-benzopyran-2,5(3H)-dione (3a) in t-BuOH affords 2-(2,2-dimethylpropylidene)-5,5-dimethyl-l,3-cyclohexanedione (la) in 80% yield via homolysis of the lactone 0-CO bond and subsequent ketene elimination.