A new, concise approach to retinoid synthesis is described based on organometallic addition to pyrylium salts; the use of 4-methylpyrylium tetrafluoroborate giving 132-retinal which is readily isomerised to retinal itself; the corresponding unsubstituted and 4-cyclohexyl pyrylium salts are transformed into 13-H and 13-cyclohexyl retinal analogues.
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