PURPOSE:To prepare the novel decarboxylative condensation product of the titled compound useful as a curing agent of epoxy resin, in high yield, by heating a saturated alicyclic 1,2-dicarboxylic acid anhydride in the presence of a basic catalyst. CONSTITUTION:The novel decarboxylative condensation product of a saturated alicyclic 1,2-dicarboxylic acid anhydride of e.g. formula II (R5-R11 are H or 1-5C alkyl) can be prepared by heating a saturated alicyclic 1,2-dicarboxylic acid anhydride of e.g. formulaI(R1-R4 are H or 1-5C alkyl)(e.g. hexahydrophthalic anhydride, 3-methyl-hexahydrophthalic anhydride, etc.) in the presence of a basic catalyst[e.g. 1,8-diaza-bicyclo(5,4,0)undecene-7;2-ethyl-4-methylimidazole]. The objective compound can be used as an epoxy resin hardener having low cure shrinkage and giving a cured product with low water absorption, etc.
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