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An improved high yielding procedure for diethyl 2,2,2-trichloroethyledine-propanedioate (3) using montinorillonite K-10 catalyst has been described. Various diethyl (substituted aminomethylene)propanedioatcs (6a-j) have been synthesised in excellent yields starting from propanedioate (3) via addition products (5a-j).
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