Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-02-28
1976-01-06
Gotts, Lewis
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260287CF, 260287XA, 260309, 26032613R, 26032614R, 26032625, 26032627, 26032634, 2603432R, 2603433, 2603434, C07D20910, C07D20912, C07D20914
Patent
active
039312283
ABSTRACT:
This invention relates to a process of preparing phthalein indicator dyes including phthalides and naphthalides derived from certain hydroxy-substituted carbocyclic aryl compounds, such as phenols, and from certain N-heterocyclic aryl compounds, such as indoles, and to a process of preparing novel intermediates useful therein. According to the present invention, the selected carbocyclic compound or the selected N-heterocyclic compound is reacted with phthalaldehydic or naphthalaldehydic acid to form the corresponding (na)phthalidyl adduct which is treated with an oxidizing agent to yield the subject intermediates. To prepare the indicator dye, the intermediate, i.e., the oxidation product thus obtained is then reacted with a carbocyclic or heterocyclic aryl compound to yield the corresponding indicator dye. The oxidation products comprising the novel intermediates of the present invention may be dehydro or hydrated (na)phthalidyl adducts.
REFERENCES:
patent: 3491116 (1970-01-01), Lin
Campbell Sybil A.
Gotts Lewis
Polaroid Corporation
Williams S. P.
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