Processes for the preparation of diphenylsulfone compounds

Details Processes for the preparation of diphenylsulfone compounds Processes for the preparation of diphenylsulfone compounds

2004-09-27

2009-11-17

Puttlitz, Karl J (Department: 1621)

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

Organic compounds

Sulfur containing

Reexamination Certificate

active

07619120

ABSTRACT:
The present invention is to provide methods for producing highly pure 4,4′-dihydroxydiphenyl sulfone monoethers advantageously in industrial production.In a process for producing a compound represented by Formula (I)(wherein, R1and R2are each independently halogen, alkyl having 1 to 8 carbons or alkenyl having 2 to 8 carbons; m and n are each independently 0 or an integer of 1 to 4; and R3is alkyl having 1 to 8 carbons, alkenyl having 2 to 8 carbons, cycloalkyl having 3 to 8 carbons or optionally substituted aralkyl), (1) a pH adjustment is carried out twice or more in the purification process, (2) an excessive amount of alkyl halide used is removed, (3) a solvent, such as water, containing 0.05 ppm or less of iron components is used, (4) tanks with corrosion-resistant layers over the inner walls are used, (6) a chelating agent is added, and (7) a means of drying with mechanical stir is applied.

REFERENCES:
patent: 3065274 (1962-11-01), Vegter et al.
patent: 3408402 (1968-10-01), Callighan et al.
patent: 3784518 (1974-01-01), Paulik
patent: 4446209 (1984-05-01), Iwakura et al.
patent: 4568766 (1986-02-01), Yahagi et al.
patent: 4616239 (1986-10-01), Yahagi et al.
patent: 5284978 (1994-02-01), Kinishi et al.
patent: 5414149 (1995-05-01), Garrett et al.
patent: 5463133 (1995-10-01), Sato et al.
patent: 6509126 (2003-01-01), Whitesides et al.
patent: 6590126 (2003-07-01), Sanpei et al.
patent: 58-20493 (1983-05-01), None
patent: 58164131 (1983-09-01), None
patent: 60-56949 (1985-02-01), None
patent: 3-258760 (1991-11-01), None
patent: 04000715 (1992-01-01), None
patent: 5-255234 (1993-05-01), None
patent: 05117224 (1993-05-01), None
patent: 05186417 (1993-07-01), None
patent: 6-25148 (1994-01-01), None
patent: 10114735 (1998-05-01), None
patent: 10-158235 (1998-06-01), None
patent: 11-124362 (1999-05-01), None
patent: 2001-011001 (2001-01-01), None
Chemical Engineer's Handbook, Perry, ed. (1963) p. 13-2.
Chemical Engineer's Handbook, Perry ed., 5th ed. pp. 16-2-16-4 and 19-4-19-6.
Extraction' in Ullmann's Encyclopedia of Industrial Chemistry, Copyright © 2008 by John Wiley & Sons, pp. 1-60.
Joseph, et al, 1995. “Direct Conversion of Alcohols into the Corresponding Iodides”. Tetrahedron Letters 36(4): 609-612.

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4124590