In the Type II photochemical reactions of cis-2-propyl-4-t-butylcyclohexanone, the ratio of cyclobutanols to fragmentation products is 13 : 87 for the singlet-state reaction and 68 : 32 for the triplet-state reaction, showing that, in the latter state at least, there is a noticeable stereoelectronic effect on the fragmentation reaction.
I. Fleming, A. V. Kemp-Jones and E. J. Thomas, J. Chem. Soc. D, 1971, 1158 DOI: 10.1039/C29710001158
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