Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane

Details Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane

1989-06-02

1991-01-22

Hines, Robert V.

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

Organic compounds

Amino nitrogen containing

C07C32100

Patent

active

049872591

ABSTRACT:
2,2-Bis(4-aminophenyl)hexafluoropropane is prepared by the steps of (a) reacting 2,2-bis(4-carboxyphenyl)hexafluoropropane with thionyl chloride at 80.degree.-150.degree. C. in a water insoluble organic liquid in the presence of a catalyst such as dimethylformamide to obtain a solution of 2,2-bis(4-chloroformylphenyl)hexafluoropropane, (b) mixing the obtained solution with an aqueous solution of sodium azide to obtain an acid azide solution, (c) heating the organic phase of the acid azide solution to 80.degree. C. or above to cause rearrangement of the acid azide into an isocyanate, (d) hydrolyzing the isocyanate by mixing the isocyanate solution with an acid such as 40-80% sulfuric acid to form a salt of the aimed diamine as an aqueous solution mixed with an organic phase, and (e) neutralyzing the aqueous solution separated from the liquid mixture obtained at step (d) to precipitate the aimed diamine. This process is favorable for industrial practice because the main steps (a) to (d) are all reactions in organic liquids without precipitating solid intermediates.

REFERENCES:
patent: 3310573 (1967-03-01), Coe
patent: 4370501 (1983-01-01), Lau
"Synthesis of Fluorinated Bifunctional Monomers", by D. I. Mendeleeva, Chem. Abstracts, vol. 65, #18523a.
Adams et al., "Organic Reactions", vol. 3, pp. 373, 375-380 and 388 (1956).
Starks et al., "Phase Transfer Catalysis", pp. 155-157 (1978).

Affiliated with

Also associated with

Rating

Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane 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 of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of preparing 2,2-bis(4-aminophenyl)-hexafluoropropane will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1555873