Synthesis of Solvent Yellow 33 (D & C Yellow 11) with excess pht

Details Synthesis of Solvent Yellow 33 (D & C Yellow 11) with excess pht Synthesis of Solvent Yellow 33 (D & C Yellow 11) with excess pht

1994-04-25

1995-11-21

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D21514

Patent

active

054688620

ABSTRACT:
A process for the manufacture of a quinophthalone, in particular Solvent Yellow 33 (D & C Yellow 11) is described. The quinophthalone, in particular Solvent Yellow 33, is made by a process in which quinaldine is condensed with a molar excess of either phthalic acid or phthalic anhydride, the acid or anhydride being employed not only as a reactant, but also as a solvent for the reaction. This process can also employ phthalic acid (or recycled phthalic acid) and phthalic anhydride together, one as the solvent and the other as the reactant.

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