[CH:1]1([CH:10]=[O:11])[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH2:3][CH2:2]1.C1C2C(=CC=CC=2)C[CH:13]1[CH:21]=[O:22].[CH2:23](O)CO>C1(C)C=CC(S(O)(=O)=O)=CC=1.C1(C)C=CC=CC=1>[CH:1]1([CH:10]2[O:22][CH:21]([CH3:13])[CH2:23][O:11]2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH2:3][CH2:2]1A solution of 297 grams of a mixture of 70% indancarbaldehyde and 30% indan-2-carbaldehyde, 300 grams of ethylene glycol, 6 grams of p-toluenesulfonic acid and 300 grams of toluene are heated 2 hours at reflux using a Dean-Stark trap to separate water. The mixture is cooled and washed with 200 milliliters of a 5 weight % sodium carbonate solution. The organic layer is distilled to provide 321 grams of 2-indanyl-4-methyl-1,3-dioxolane (b.p.121° C. at 3 mm).
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