Process for preparing diketonato-rhodium(I)-carbonyl complexes

US9163045B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Eileen Woerner · Nidderau, DE
• Timo Ebert · Mensengesäß, DE
• Ralf Karch · Kleinostheim, DE
• Andreas Rivas-Nass · Schriesheim, DE
• Angelino Doppiu · Seligenstadt, DE
• Juergen Widmer · Rodenbach, DE

Key dates

• Filing date: Apr 25, 2013
• Grant date: Oct 20, 2015
• Expiry date: Apr 25, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F15/0073
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing diketonato-rhodium(I)-carbonyl complexes, especially diketonato-rhodium(I)-triorganophosphine-carbonyl complexes, for example Rh(CO)(PPh3)acac. The process according to the invention is a “one-pot synthesis” and features a process procedure without intermediate isolation stages. After introduction of an Rh(III) halide precursor into a solvent and sparging with carbon monoxide (CO), a diketo compound of the R′—C(═O)—CH2—C(═O)—R″ type and a base are added, forming the intermediate compound diketonato-Rh(CO)2. After addition of a triorganophosphine of the PR3 type, the reaction mixture is heated and the diketonatocarbonyltriorganophosphine-rhodium(I) complex is removed. The process enables a rapid operation and a high yield. The complex Rh(CO)(PPh3)acac prepared in accordance with the invention, because of its purity, is particularly suitable as a catalyst or precatalyst for homogeneous catalysis, for example for hydroformylation reactions.