Abstract
Condensation of substituted benzaldehydes of vanillin series with dimedone in methanol solution in the presence of catalytic quantities of triethylamine afforded 2,2′-arylmethylenebis(3-hydroxy-5,5-dimethylcyclohex-2-en-1-ones. By catalytic cyclization of the latter in boiling benzene in the presence of sulfo cation exchanger FIBAN K-1 as catalyst 3,3,6,6-trimethyl-9-aryl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-diones were synthesized.
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