Acid-catalyzed hydrolysis of erythro-veratrylglycerol-β-(2-methoxyphenyl) ether in mixed aqueous-organic media yields, in addition to Hibbert's ketones formed via readily hydrolyzable C6 C3 -enol ether intermediates, the cis-and trans-isomers of a C6 C2 -enol ether. The formation of these C6 C2 isomers involves the elimination of the γ-carbinol group as formaldehyde. Both C6 C2 -enol ether isomers are unexpectedly resistant towards hydrolysis. In aqueous dioxane and ethanol systems, the competing formation of the C6 C2 -enol ethers is increased with increasing concentration of the organic solvent and with increasing reaction temperature.
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Hoo et al. (1983) studied this question.
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