Process for the preparation of naphthostyril

Details Process for the preparation of naphthostyril Process for the preparation of naphthostyril

1988-03-14

1989-04-25

Ceperley, Mary E.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20992

Patent

active

048249629

ABSTRACT:
Process for the preparation of naphthostyril by dissolving 1,8-naphthalimide in an aqueous solution of lithium hydroxide and potassium hydroxide while heating at 40.degree. C. to 80.degree. C., cooling the solution obtained to 14.degree. C. and seeding it at said temperature with a maximum of 1 mol-% of sodium 1,8-naphthalimide per 1 mol of 1,8-naphthalimide used, then adding chlorine bleaching liquor at 10.degree. C. to 20.degree. C., reductively removing excess active chlorine after the reaction has taken place, adjusting the alkaline aqueous solution produced of the alkali-metal salt of the 1-aminonaphthal-ene-8-carboxylic acid formed to a pH of 2.0 by adding acid and isolating the naphthostyril which precipitates in this process.

REFERENCES:
Chem. Abs., Number Section, 1965-71, Registry Nos. 26500-00-5 through 30299-99-1, No. 29878-91-9.
Ullmanns Encyklopaedie deo technischen Chemie, 4th Ed., vol. 9, Verlag Chemie, 1975, pp. 543-44.

Affiliated with

Also associated with

Rating

Process for the preparation of naphthostyril does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of naphthostyril, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of naphthostyril will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1196754