Method of producing 3-dibutylamino 6-methyl-7-anilinofluoran

Details Method of producing 3-dibutylamino 6-methyl-7-anilinofluoran Method of producing 3-dibutylamino 6-methyl-7-anilinofluoran

1990-12-20

1992-05-05

Shen, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31182

Patent

active

051109522

ABSTRACT:
A method of producing a high melting point 3-dibutyl amino-6-methyl-7-anilinofluoran characterized by peaks at diffraction angle (2 .theta.) of 6.9.degree., 11.0.degree., 18.5.degree. and 18.9.degree. in X-ray diffractiometry using Cu-K .alpha. ray and having a melting point in the range of 179.degree.-186.degree. C., which comprises: condensing 2-(4-dibutylamino-2-hydroxy-benzoyl) benzoic acid with 4-methoxy-2-methyldiphenylamine in the presence of concentrated sulfuric acid to provide a phthalide at a temperature in the range of 0.degree.-50.degree. C., neutralizing the phthalide, and then subjecting the phthalide to ring closure reaction using an alkali in an amount of 0.5-15 mols per mol of the compound used in smaller amounts of 2-(4-dibutylamino-2-hydroxy-benzoyl) benzoic acid and 4-methoxy-2-methyldiphenylamine at a temperature of not less than 50.degree. C. in the presence or absence of an organic solvent.

REFERENCES:
patent: 4017710 (1991-05-01), Igaki et al.
patent: 4341403 (1982-07-01), Igarashi et al.
patent: 4536220 (1985-08-01), Kondo et al.
patent: 4749796 (1988-06-01), Sensui et al.
patent: 4806657 (1989-02-01), Zink
patent: 4837210 (1989-06-01), Dwyes-Hallquist et al.

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