Propylene Glycol → 1,3-Dioxolane, 2,4-dimethyl-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-

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Reaction Conditions

Reaction Steps

p-Toluenesulphonic acid monohydrate (2 g) is added to a suspension of 120 g (0.5 mol) of 6-acetyl-1,1,4,4-tetra-methyl-tetralin, 120 g (1.6 mol) of propylene glycol and 600 ml of toluene. The mixture is heated to 110° C. The reaction water is removed azeotropically within 5 hours. After cooling to room temperature the mixture is adjusted to pH 7.5 to 8 by the addition of 10% potassium hydroxide in ethanol. Thereupon, the mixture is filtered. The solvent is evaporated and the residual liquid is distilled under a vacuum, whereby there separate as the main product 123 g of 2.4-dimethyl-2-(1,1,4,4-tetramethyl-tetralin-6-yl)-1,3-dioxolane as a mixture of the boiling point is 112° C. at 0.5 mmHg; nD20 =1.5130. The product has a strong woody, animalic odour.

Provenance & Evidence