The sodium derivatives of the nitrile-esters of 2-methylpropene-1,1,3,3-tetracarboxylic acid (HOOC)2C=C(CH3)–CH(COOH)2 have been synthesized, and their properties have been compared with those of the corresponding compounds of the propene-1,1,3,3-tetracarboxylic acid series synthesized previously. It has been observed that, with one exceptional case of the 1,3-dicyano-1,3-dicarbethoxy-compounds, there exist analogies in all respects between the 2-methylpropene-tetracarboxylic acid series and the propenetetracarboxylic acid series.
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Urushibara et al. (1936) studied this question.
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