The stereochemistry of the cis- and trans-1,2-dimethylcyclopropanes produced on photolysis of cis-and trans-3,4-dimethyl-Δ1-pyrazoline indicates that triplet biradicals are intermediates; the results also indicate that triplet biradical production becomes more important on photolysis at shorter wavelengths.
S. D. Nowacki, P. B. Do and F. H. Dorer, J. Chem. Soc., Chem. Commun., 1972, 273 DOI: 10.1039/C39720000273
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