Photochemical dimerization of N-methyl-2-pyridone in water gives exclusively the 4 + 4 cyclo-addition products trans–anti(3)(the known product), trans–syn(4), cis–anti(5), and cis–syn(6a) in yields of 51, 0·6, 11·2, and 6·8%, respectively; structures were assigned on the basis of spectral and chemical evidence.
Y. Nakamura, T. Kato and Y. Morita, J. Chem. Soc., Chem. Commun., 1978, 620 DOI: 10.1039/C39780000620
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