Acid catalysed cyclisation of the olefinic β-hydroxy selenide (5) afforded the cyclic compound (7) which was converted into safranal (16)via the olefinic alcohol (12), diolefinic alcohol (14), and aldehyde (15).
T. Kametani, K. Suzuki, H. Kurobe and H. Nemoto, J. Chem. Soc., Chem. Commun., 1979, 1128 DOI: 10.1039/C39790001128
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