Abstract
It has been established that of the known N′,N″-dimethyldi-imides of N″′,N″′′-hexamethylene-bis-aspartic acid the stereoisomer with m.p. 114–115° is a racemic mixture, and the isomer with m.p. 74·5–75° is a mesoform. For interfacial polycondensation of the stereoisomeric diaminodi-imides with terephthalic acid chloride the optimum systems are chloroform-water and benzene-water, with initial di-imide concentrations of 0·30 to 0·35 mole/l. (CHCl 3 : H 2O) and 0·15 mole/l. (C 6H 6 : H 2O). The best acceptors are Na 2CO 3 and NaHCO 3. An optically active poly(amido)imide with [M] D = 95·4° has been synthesized on the basis of the optically active diaminodi-imide.
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