11H-Benzo[a]carbazole and the 1-, 2-, 3-, and 4-methyl derivatives have been obtained by photocyclisation of the appropriate 3-styrylindoles. The 1- and 4-methyl compounds can be distinguished by the chemical shifts of the methyl protons. A convenient route to 3-styrylindoles is described.
W. Carruthers and N. Evans, J. Chem. Soc., Perkin Trans. 1, 1974, 421 DOI: 10.1039/P19740000421
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