Syntheses of fluorescein compounds with excess resorcinol as a solvent
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United States of America Patent
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Jun 10, 1997
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N/A
app pub date -
Sep 27, 1995
filing date -
Sep 27, 1995
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Abstract
A process for the manufacture of fluorescein compounds suitable for conversion to FDA certified dyes is described. The fluorescein compounds, and in particular fluorescein (also known as Solvent Yellow 94 or D&C Yellow No.7) and 3,4,5,6-tetrachlorofluorescein, are made by a process involving the condensation of a phthalic anhydride with several molar excess of a resorcinol, the resorcinol being employed not only as a reactant, but also as a solvent for the reaction. This process also can employ the unreacted resorcinol and any intermediates or by-products from the condensation reaction as a reactant and as a solvent in subsequent condensation reactions.
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