Example 026 (6π conrotation)

Photochemical electrocyclic ring-closure of 1,3,5-hexatriene

Photochemical electrocyclic ring-closure of 1,3,5-hexatriene
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S. W. Orchard and B. A. Thrush, Proc. R. Soc. London, Ser. A, 1974, 337, 243–256
DOI: 10.1098/rspa.1974.0047

N.B.The results in this paper illustrate the difficulties associated with interpreting the results of light-induced reactions. The photochemical interconversion of hexatriene and cyclohexadiene is evident, but other photochemical and thermal transformations of starting materials and products always accompany this process.