Process for isomerization of 2-halothiophene to 3-halothiophene

Details Process for isomerization of 2-halothiophene to 3-halothiophene Process for isomerization of 2-halothiophene to 3-halothiophene

2007-04-24

2007-04-24

Lambkin, Deborah C. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

11033572

ABSTRACT:
An improved process and catalyst system for the isomerization of halothiophenes. More particularly, an improved process for the isomerization of 2-halothiopehenes to 3-halothiophenes by reacting a 2-halothiophene with a catalyst and in the presence of a base. The addition of a base additive to the acidic zeolite catalyst allows the desired isomerization reaction to take place while suppressing side-reactions that result in the decomposition of thiophene rings. The catalyst lifetime is thus increased and the amount of catalyst needed for the reaction is reduced, lowering cost.

REFERENCES:
patent: 4169839 (1979-10-01), Houbiers et al.
patent: 4604470 (1986-08-01), Eichler et al.
patent: 4889940 (1989-12-01), Grosvenor et al.
patent: 6166172 (2000-12-01), McCullough et al.
Dettmeier U, et al “Preparation of Beta Halothiophenes by Isomerization of Alpha Halothiophenes on Zeolite Catalysts” Vo. 26, No. 5, 1987 pp. 468-469 XP002378685.
Brandsma, L. et al “A Large-Scale Procedure for the Preparation of 3-Bromothiophene from 2-Bromothiophene and Sodamide in Liquid Ammonia” dated 1990, pp. 1967-1700 XP 009065764.

Affiliated with

Also associated with

Rating

Process for isomerization of 2-halothiophene to 3-halothiophene 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 isomerization of 2-halothiophene to 3-halothiophene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for isomerization of 2-halothiophene to 3-halothiophene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3724427