The DDQ dehydrogenation of (IV) can be directed towards formation of either a 1 : 1-mixture of (VII) and (VIII), in the presence of anhydrous hydrogen chloride, or exclusively to an α-pyran system (VI) under the influence of toluene-p-sulphonic acid.
S. Sarel, Y. Shalon and Y. Yanuka, J. Chem. Soc. D, 1970, 81 DOI: 10.1039/C29700000081
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