Patent · US Expired

Cyclic keto-butyraldehydes a process for their preparation, and their use in the preparation of cyclic diisocyanates

US4505860A · kind A · utility

3Cited by

3References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gerhard Klein · Monheim, DE
Dieter Arlt · Cologne, DE
Rudolf Braden

Key dates

Filing date	Aug 23, 1982
Grant date	Mar 19, 1985
Priority date	—
Expiry date	Aug 23, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/753
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

New cyclic keto-butyraldehydes of the formula ##STR1## in which R.sub.1 and R.sub.2 are either identical or different and denote hydrogen or lower alkyl and in which the cycloaliphatic ring may contain a double bond, can be prepared from the corresponding cyclic keto-olefins in the presence of a rhodium-containing catalyst by reaction with carbon monoxide and hydrogen. The new cyclic keto-butyraldehydes can be used in the preparation of diisocyanates which are used as crosslinking agents in the preparation of polyurethanes.

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