Patent · US Expired

Process for preparing thiophene derivatives

US4889940A · kind A · utility

3Cited by

2References

10Claims

0Family size

Assignee

Shell Internationale Research Maatschappij B.V. · NL

Inventors

Peter R. Grosvenor · Wolverhampton, GB
Lance Svend Fuller · Penkridge, GB

Key dates

Filing date	Jun 13, 1988
Grant date	Dec 26, 1989
Priority date	—
Expiry date	Jun 13, 2008

Classification

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

Abstract

A process for the preparation of a thiophene derivative which is substituted at the beta-position by a bromine atom, which comprises reacting the corresponding beta-unsubstituted thiophene with an aromatic compound which is substituted with a bromine atom, in the presence of an alkali metal amide and a catalyst which is capable of forming a complex with the cation of the alkali metal amide.

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