Preparation of isatoic anhydrides

Details Preparation of isatoic anhydrides Preparation of isatoic anhydrides

1980-06-02

1982-02-16

Randolph, John D.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

C07D26526

Patent

active

043160204

ABSTRACT:
A process for the preparation of isatoic anhydrides of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is hydrogen, alkyl, alkoxy, halogen, nitro, haloalkyl or haloalkoxy, by reacting an isatin of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the stated meanings, with hydrogen peroxide in an acid medium.

REFERENCES:
patent: 3238201 (1966-03-01), Scherrer
Erdmann et al., Ber. Deut. Chem., vol. 32, pp. 2159 to 2172 (1899).
Kolbe, J. Prakt. Chem., vol. 30, pp. 84-87, 467 to 483 (1884).
Mohr, J. Prakt. Chem., vol. 80, pp. 1-24 (1909).
The Merck Index, 9th Ed., Conant, The Chemistry of Organic Compounds, pp. 402-403, the Macmillan Company, NY Sixth Printing 1943.
Krow, Synthesis, pp. 50 to 51, Jan. 1979 (copyrighted 1979 Georg Thieme Publishers).

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