Continuous preparation of isatoic anhydride

Details Continuous preparation of isatoic anhydride Continuous preparation of isatoic anhydride

1980-11-24

1982-05-04

Raymond, Richard

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26526

Patent

active

043283390

ABSTRACT:
A process for the continuous preparation of isatoic anhydrides by two-stage reaction of an alkali metal phthalamate and/or alkali metal phthalimidate with an alkali metal hypohalite, the first stage being carried out substantially adiabatically and both stages being carried out at high flow rates, wherein phthalimide and/or phthalamic acid is first dissolved in a certain amount of an alkali metal hydroxide solution, the resulting solution is mixed with a hypohalite and reacted at a particular temperature, acid is then added and the reaction is completed at a particular temperature. The compounds obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and scents.

REFERENCES:
patent: 3324119 (1967-06-01), Hill et al.
patent: 3687951 (1972-08-01), Humburger et al.
patent: 3847974 (1974-11-01), Sturm et al.
patent: 3984406 (1976-10-01), Quadbeck-Seeger et al.
Mohr, J. fur Prakt. Chemie (2), vol. 80, pp. 1-33, (1909).

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