Process for the production of N-(hydroxyphenyl) maleimides

Details Process for the production of N-(hydroxyphenyl) maleimides Process for the production of N-(hydroxyphenyl) maleimides

1979-10-26

1981-09-15

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D207452

Patent

active

042896991

ABSTRACT:
N-(hydroxyphenyl) maleimides of the general formula ##STR1## where R' stands for H, CH.sub.3, C.sub.2 H.sub.5, F, Cl, Br or I and n is an integer of 1-5 are produced by treating the corresponding maleamic acid or by treating the ester of said N-(hydroxyphenyl) maleimide at a temperature of 0.degree.-150.degree. C. in the presence of at least one dehydrating agent selected for the group consisting of oxides and oxyacids of sulfur or phosphorus and alkali metal and alkaline earth metal salts of the said oxyacids. The corresponding maleamic acid can be obtained by reacting an aminophenol having one or more hydroxyl groups on its phenyl nucleus with maleic anhydride. The esters of the N-(hydroxyphenyl maleimide) can be obtained by reacting said aminophenol and said maleic anhydride in the presence of a conventional acid anhydride dehydrating agent and a conventional imide-forming cyclization catalyst.

REFERENCES:
patent: 3265708 (1966-08-01), Stiteler
patent: 3338919 (1967-08-01), Nield
patent: 3758498 (1973-09-01), Pfuller et al.
patent: 4130564 (1978-12-01), Haug et al.

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