Process for the dehydration of bis-maleamic acids

Details Process for the dehydration of bis-maleamic acids Process for the dehydration of bis-maleamic acids

1973-09-28

1976-08-17

Rollins, Alton D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260691, C07D20744

Patent

active

039754014

ABSTRACT:
An improved process for the dehydration of bis-maleic acids to bis-maleimides is provided which comprises heating the bis-maleamic acid with a lower carboxylic acid anhydride in acetone, in the presence of 0.2 to 1 mol of tertiary amine per mol of bis-maleamic acid and of a soluble nickel derivative and 0.1 to 10 mols of water per mol of bis-maleamic acid and precipitating the resulting bis-maleimide by the addition of water. The addition of water to the starting materials reduces the proportion of by-products produced and increases the degree of cyclodehydration.

REFERENCES:
patent: 3018290 (1962-01-01), Sauers
patent: 3148196 (1964-09-01), Ladd
patent: 3627780 (1971-12-01), Bonnard et al.
patent: 3839358 (1974-10-01), Bargain

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