Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1978-11-02
1980-11-04
Tovar, Jose
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07D20744
Patent
active
042319340
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 0-150.degree. C. in the presence of at least one dehydrating agent selected from 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.
Kawamata Motoo
Koga Nobuhito
Oba Masayuki
Tsuboi Hikotada
Mitsui Toatsu Chemicals Incorporated
Tovar Jose
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