N-Substituted aspartic acid monoesters

Details N-Substituted aspartic acid monoesters N-Substituted aspartic acid monoesters

1980-04-28

1982-04-20

Schwartz, Richard A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

546232, 546246, 548341, 560145, C07C10122, C07D23361

Patent

active

043260691

ABSTRACT:
N-substituted aspartic acid monoesters of the formula I ##STR1## wherein for example R.sub.1 is an alkyl group having 1 to 12 C atoms, cyclohexyl, phenyl, tolyl or benzyl, x is 2 or 3, R.sub.2 and R.sub.3 are each a methyl or ethyl group, or together with the N atom they form an N-heterocyclic ring, are obtained by adding, by means of an addition reaction, to 1 mol of a maleic acid monoester of the formula II ##STR2## 1 mol of an amine of the formula III ##STR3## in the presence of a tertiary amine. The novel N-substituted aspartic acid monoesters are valuable curing accelerators for epoxide resin mixtures containing dicyandiamide or a polycarboxylic acid anhydride as curing agent. They are also suitable alone as catalytically acting curing agents for epoxide resins.

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