Terephthalic Acid → 3,4'-dihydroxybenzophenone

Participants

Reaction Conditions

Reaction Steps

The flask was charged with 9.57 g of diacetoxybenzophenone (0.032 mole) and 4.98 g of terephthalic acid (0.03 mole) and heated, with stirring, under nitrogen at atmospheric pressure from 238° C. to 310° C. in 48 min. Most of the acetic acid by-product was liberated in this time. Heating at 310° C. continued 22 min. more. Then a vacuum of 0.2 torr (0.0266 kPa) was applied, and a temperature was raised to 325° C. in 8 min. and maintained for 17 min. The cooled polymer had an inherent viscosity, ηinh, of 0.78. Its melt was anisotropic above its flow temperature of 296° C. using the TOT test.

Provenance & Evidence