of the reaction vessel the vacuum was then turned off and the system was purged with n 2 gas at atmospheric pressure the thus formed product mixture was allowed to cool to ambient temperature the product was recovered after carefully breaking the glass with a hammer yield 88 1 h nmr cdcl 3 u03b4 8 60 arh s 1h 8 00 arh u2014 s 2h 7 70 arh s 4h 6 15 u2014 cf 2 u2014 cfh u2014 o u2014 d 1 h 4 70 4 50 coo u2014 ch 2 u2014 m 4h 3 95 u2014 ch 2 u2014 oh t 2h 3 85 u2014 ch 2 u2014 o u2014 ch 2 u2014 t 4h 2 45 2 30 u2014 ch 2 u2014 m 2h 2 10 u2014 ch 2 u2014 ch 2 u2014 o u2014 ch 2 u2014 ch 2 u2014 m 4h thermal data t g 5 u00b0 c no melting point was observed m n 9 1 d m w 16 6 da dimethylterephthalate 150 g and 1 3 propanediol 105 9 g were charged to an oven dried 500 ml three necked round bottom flask equipped with an overhead stirrer and a distillation condenser the reactants were stirred under a nitrogen purge at a speed of 10 rpm while the condenser was kept at 23 u00b0 c the contents of the flask were.