N-(Cyclohexyl)dimethylketenimine on photoreaction with p-benzoquinone and p-naphthoquinone forms the 1 : 1 adducts 1 -cyclohexyl-5-hydroxy-3,3-dimethylindolin-2-one and 1-cyclohexyl-1,3-dihydro-5-hydroxy-3,-3-dimethylbenz[g]indol-2-one, respectively. A mechanism involving addition and rearrangement is proposed.
N. Ishibe and Y. Yamaguchi, J. Chem. Soc., Perkin Trans. 1, 1973, 2618 DOI: 10.1039/P19730002618
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