The finding that t-butyl pyruvate is photostable and has a much longer triplet lifetime than methyl, ethyl, isopropyl, 2-deuterioisopropyl, and benzyl pyruvates, together with triplet quenching studies, shows that alkyl pyruvates fragment from the triplet state via a Type II and not a Type I process.
R. S. Davidson and D. Goodwin, J. Chem. Soc., Perkin Trans. 2, 1982, 993 DOI: 10.1039/P29820000993
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