Styrene → Dimethyl 2-phenyl-cyclohexane-1,4-dicarboxylate

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In a 75 ml sealed tube, a stirred suspension of trans,trans dimethyl muconate (10.0 g, 58.8 mmol), two equivalents of styrene (13.5 ml, 117.6 mmol), neutral Al2O3 (300 mg of Aldrich 199974, 3 mass percent), and tert-butyl catechol (25 mg, 0.2 mol percent) in diglyme (20 ml, 2.9 M) is heated to 150° C. for 24 hours. After cooling to room temperature, the reaction mixture is filtered, transferred to a flask, and concentrated. The residue is redissolved in triglyme (0.5 M). Pd/Al2O3 catalyst is added (636 mg (0.5 mol percent) of Johnson-Matthey 5 percent Pd/Al2O3 #12) at room temperature. The flask is equipped with a reflux condenser, fritted gas dispersion tube, and internal Temperature probe. Under N2 flow (190 ml/min) and stirring (190 rpm) the mixture is heated to reflux for 63 hours whereby dimethyl phenyl-terephthalate is formed. Some dimethyl 2-phenyl-cyclohexane-1,4-dicarboxylate is also produced.

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