1:1 Adducts of indole and (na)phthalaldehydic acid

Details 1:1 Adducts of indole and (na)phthalaldehydic acid 1:1 Adducts of indole and (na)phthalaldehydic acid

1977-06-22

1979-04-24

Rizzo, Nicholas S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252408, C07D20904

Patent

active

041511743

ABSTRACT:
This invention relates to derivatives of phthalaldehydic and naphthalaldehydic acid useful as intermediates in the preparation of pH-sensitive phthalide and naphthalide indicator dyes.
A class of intermediates provided by the present invention comprises compounds of the formula: ##STR1## wherein A represents 4'-hydroxy-1'-naphthyl; B represents 4'-hydroxy-1'-naphthyl or indol-3-yl and C represents a 2-carboxy-1-phenyl radical or an 8-carboxy-1-naphthyl radical and preferably is 8-carboxy-1-naphthyl.

REFERENCES:
patent: 3816453 (1974-06-01), Karger et al.
patent: 4001278 (1977-01-01), Borror
patent: 4036863 (1977-07-01), Karger et al.

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