Solketal → Bis[(2,2-dimethyl-1,3-dioxolan-4-yl)methyl]isophthalate

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Into a five liter capacity, four-necked flask equipped with a thermometer, stirrer, nitrogen inlet and a 10-inch helix packed column were placed 1322 grams (10 moles) of 2,2-dimethyl-4-hydroxymethyl-1,3-dioxolane (Comonomer A herein), 971 grams (5 moles) of dimethyl isophthalate, 1700 grams of dry toluene and 7 grams of sodium methoxide. The reaction mixture was heated to reflux. During 5 hours, a binary mixture (927 grams) of toluene-methanol was collected at a head temperature of 95°-106° C. by maintaining a flask temperature of 137°-145° C. After cooling to 25° C., 500 ml. of dichloromethane was dissolved in the reaction mixture. The resulting mixture was washed with four 1000 ml. portions of 5 per cent aqueous sodium chloride solution. The organic layer was dried over anhydrous magnesium sulfate, filtered, and evaporated to give a crude amber-colored oil. Distillation of the oil afforded 999.5 grams (51 per cent yield) of substantially pure white product having a boiling point of 205°-212° C. (at 0.50-0.60 mm. pressure). Analysis of the product showed carbon and hydrogen contents of 60.74 and 6.83 weight per cent, respectively. The calculated carbon and hydrogen contents (basis, C20H26O8) are 60.91 and 6.59 respectively.

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