SCHEDULED MAINTENANCE
Pyridine or pyridinium hydrochloride catalysed condensation of 3-hydroxyisovaleraldehyde dimethyl acetal with phloroacetophenone gave six characterisable products all containing the 2,2-dimethylchromen ring system, including the tricyclic pyranochromen (I).
W. J. G. Donnelly and P. V. R. Shannon, J. Chem. Soc. D, 1971, 76a DOI: 10.1039/C2971000076A
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