Example 026 (6π conrotation)
Photochemical electrocyclic ring-closure of 1,3,5-hexatriene
S. W. Orchard and B. A. Thrush, Proc. R. Soc. London, Ser. A, 1974, 337, 243–256
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.