Simple aliphatic aldehydes with a C4 or longer chain undergo ‘type 2’ photoelimination and photocyclisation as major reactions in solution. Both singlet and triplet nπ* states are direct precursors to products in these reactions. Quenching studies show that the triplet lifetime, governed largely by the rate constant for intramolecular hydrogen-abstraction, varies with the substituent at position 4 in the chain.
J. D. Coyle, J. Chem. Soc. B, 1971, 2254 DOI: 10.1039/J29710002254
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