Photolysis of 3-acetyl-2-alkoxy-4,6-dimethylpyridines gives cyclobutenols, 2-alkoxy-3,6-dimethyl-3-hydroxy-cyclobuta[c]pyridines, in good yields via Norrish Type II cyclizations whereas 3-acetyl-2-methylpyridine does not cyclize to cyclobutenol.
M. Sakamoto, M. Fujihira, M. Takahashi, K. Enomoto, N. Nishimiya, T. Fujita and S. Watanabe, J. Chem. Soc., Chem. Commun., 1993, 1023 DOI: 10.1039/C39930001023
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