Protonated indole phthalides and naphthalides

Details Protonated indole phthalides and naphthalides Protonated indole phthalides and naphthalides

1973-09-04

1976-05-04

Rush, Raymond V.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252300, 252408, 26032634, 2603432R, 2603433R, C07D20912

Patent

active

039547990

ABSTRACT:
This invention relates to protonated compounds of the formula: ##SPC1##
Wherein A is a radical selected from ##SPC2##
X represents the atoms necessary to complete a ring-closing moiety selected from phthalide and naphthalide; and Z is an anion derived from a protic acid. These compounds are useful as intermediates in the preparation of phthalide and naphthalide indicator dyes.

REFERENCES:
patent: 3804855 (1974-04-01), Farber

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