Synthesis of pyrazolinylnaphthalic acid derivatives
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United States of America Patent
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Sep 11, 2001
Grant Date -
Aug 9, 2001
app pub date -
Dec 21, 2000
filing date -
Dec 28, 1999
priority date (Note) -
Expired
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Abstract
The invention pertains to a method for preparing derivatives of the pyrazolinylnaphthalic acid having the general formula ##STR1## where Ar.sub.1 and Ar.sub.2 are unsubstituted or substituted phenyl radicals bearing in the para position an alkylated or acylated oxy- or amino group, or a polynuclear aryl radical, and Ar.sub.3 is a substituted N-naphthalimid or 1,8-naphthylene-1',2'-benzimidazole. Compounds of the above general formula are high-efficient red organic luminophors and are used widely as luminescent components of dyes for plastics and liquid scintillators, in hydrogeology to study water streams, to label the chemical industry wastewaters, as laser dyes, etc.
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