Abstract
NorRIsh type II photolysis of 1-benzoyl-1-methylcyclopentane, labeled with 13C in the carbonyl position, produces emissive CIDNP in the cyclization product. The polarization is consistent with the formation of a 1,4-biradical with a singlet ground state. By comparing this result with those for other biradicals, inferences are drawn about possible factors governing the singlet—triplet splittings of biradicals.
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