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Bulletin of the Chemical Society of Japan
Vol. 51 (1978) No. 5 P 1555-1556



Anhydroyplyaspartic acid (APAA) was prepared by the thermal polycondensation of L-aspartic acid in the solid state at 160-220 °C for 5 h. The effect of temperature on molecular weight and optical purity of APAA was investigated. The molecular weight increases rapidly in the temperature range 180–200 °C, the yield of APAA also increasing rapidly. The optical purity deecreases rapidly with rise in temperature from 160–180 °C.

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