trans-Isohumulone (2) is photolysed to dehydrohumulinic acid (5) by a Norrish type 1 cleavage, affording a precursor of 3-methylbut-2-ene-1-thiol, the compound responsible for the sunstruck flavour of beer.
G. M. A. Bondeel, D. D. Keukeleire and M. Verzele, J. Chem. Soc., Perkin Trans. 1, 1987, 2715 DOI: 10.1039/P19870002715
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