Patent · US Expired

Method for producing butyrolactones

US6346629B1 · kind B1 · utility

1Cited by

5References

10Claims

0Family size

Assignee

BASF SE

Inventors

Melanie Brunner · Schifferstadt, DE
Ralf-Thomas Rahn · Mannheim, DE
Udo Rheude · Otterstadt, DE
Jochem Henkelmann · Mannheim, DE

Key dates

Filing date	Nov 15, 2000
Grant date	Feb 12, 2002
Priority date	—
Expiry date	Nov 15, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D315/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for producing butyrolactones of the general formula I where R1 and R2 are each hydrogen, alkyl, hydroxyalkyl, substituted or unsubstituted aryl or substituted or unsubstituted trialkylsilyl, by reacting alkynes of the general formula II where R1 and R2 are each as defined above, with carbon monoxide and water in the presence of a rhodium catalyst under pressures from 20 to 300 bar and hydrogenating the unhydrogenated 2(5H)-furanone intermediates comprisesa) reacting the carbonylation reaction mixture with hydrogen at from 150 to 250° C. and from 100 to 300 bar,b) removing the precipitated catalyst and returning it into the carbonylation reaction, andc) subjecting the catalyst-free reaction mixture to a distillation to recover the butyrolactone.

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