Four isomeric cyclic acetals of glycerol and acetaldehyde: cis-5-hydroxy-2-methyl-1,3-dioxane [3674-23-5], trans-5-hydroxy-2-methyl-1,3-dioxane [3674-24-6], cis-4--hydroxymethyl-2-methyl-1,3-dioxolane [3674-21-3] and trans-4-hydroxymethyl-2-methyl-1,3-dioxolane [3674-22-4] were detected in Spanish fino sherry by gas chromatography and identified by mass spectrometry and Kovat9s indices.
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Muller et al. (1978) studied this question.
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