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Photochemical Synthesis of 2-Alkylidene-1,3-cyclocalkanediones. Preliminary Communication

✍ Scribed by Klaus Hobel; Paul Margaretha

Publisher
John Wiley and Sons
Year
1987
Tongue
German
Weight
118 KB
Volume
70
Category
Article
ISSN
0018-019X

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✦ Synopsis

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.

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