Synthesis agent containing methyllithium/lithium bromide, and process for the preparation thereof

US7501075B2 · kind B2 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Ute Emmel · Frankfurt am Main, DE
• Peter Rittmeyer · Pocking, DE
• Ulrich Wietelmann · Friedrichsdorf, DE
• Rainer Aul · Rodgau, DE

Key dates

• Filing date: Aug 23, 2005
• Grant date: Mar 10, 2009
• Expiry date: Apr 3, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F1/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A synthesis agent containing methyllithium and lithium bromide is described, in which MeLi and LiBr are dissolved in a solvent of the general formula (I)wherein R1 and R2 independently of one another are H, methyl (Me) or ethyl (Et), and R3 and R4 are Me or Et,the molar ratio of LiBr to MeLi being at least 0.7 and not more than 1.5 and the methyllithium concentration being at least 4 wt. %.