A free-rotor effect in ฮฒ,ฮณ-unsaturated k
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Kenneth G. Hancock; Ronald O. Grider
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Article
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1972
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Elsevier Science
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French
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We recently reported the singlet-state photochemical rearrangement of 3-methylene-2,2,5,5-tetramet~lcyclohexanone (1) via a 1,3-sigmatropic acyl shift to 3,3-dimethyl-5-isopropylidenecyclohexanone (g).", However, 17~-acetoyy-4,4-dimetQrl-19-norandrost-5-en-3-one (3)isknown to undergo a triplet-state