Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1978-02-09
1981-04-07
Daus, Donald G.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
26032613F, C07D20918
Patent
active
042605440
ABSTRACT:
Novel halogenomethylene-indoxyls [halogeno-(3-oxa-[2H]- indol-2-ylidene)-acetic acids] and a novel process for their preparation by reacting N-acylanilides with dihalogenomaleic anhydrides or derivatives thereof are described. The novel halogenomethylene-indoxyls are valuable intermediates for the preparation of pharmaceutical active compounds having anti-allergic properties.
Bosshard Hans
Buhler Niklaus
Sallmann Alfred
Ciba-Geigy Corporation
Daus Donald G.
Hall Luther A. R.
Springer D. B.
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