p-Toluenesulfonic acid → 1,1-Dimethylethyl 2,2-dimethyl-6-(2-phenylethenyl)-1,3-dioxane-4-acetate

Participants

Reaction Steps

To a solution of 1,1-dimethylethyl 3,5-dihydroxy-7-phenyl-6-heptenoate (5.5 g, 19 mmol) in acetone (2.3 g, 40 mmol) was added a catalyic amount of p-toluenesulfonic acid. After stirring for 2 hours, the mixture had solidified and was dissolved in excess acetone and filtered through a pad of sodium carbonate. The excess acetone was removed in vacuo and the residue crystallized from isopropyl ether to give 3.4 g of the title compound; m.p. =91°-93° C.

Provenance & Evidence