Patent · US Expired

Process for isomerization of 2-halothiophene to 3-halothiophene

US7208610B2 · kind B2 · utility

0Cited by

4References

21Claims

0Family size

Assignee

HONEYWELL INTERNATIONAL INC. · US

Inventors

Christian Werner · Hannover, DE
Andreas Kanschik-Conradsen · Garbsen, DE
Bernd Kellermeier · Sachsenhagen, DE
Hans-Jurgen Schmidt · Speyer, DE

Key dates

Filing date	Jan 12, 2005
Grant date	Apr 24, 2007
Priority date	—
Expiry date	Oct 17, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D333/28
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.