1:1 Adducts of 1-naphthol and (Na)phthalaldehydic acid

Details 1:1 Adducts of 1-naphthol and (Na)phthalaldehydic acid 1:1 Adducts of 1-naphthol and (Na)phthalaldehydic acid

1974-04-01

1976-08-24

Sutto, Anton H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603433R, C07D31106

Patent

active

039766624

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. One class of intermediates provided by the present invention comprises compounds of the formula: ##SPC1##
Wherein A represents 4'-hydroxy-1'-naphthyl and X represents the atoms necessary to complete a ring-closing moiety selected from a phthalide and a naphthalide and preferably is naphthalide.
Another class of intermediates provided by the present invention comprises compounds of the formula: ##SPC2##
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: 3772339 (1973-11-01), Greenwald
patent: 3816453 (1974-06-01), Karger et al.
patent: 3833614 (1974-09-01), Simon

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