Cyclic keto-butyraldehydes a process for their preparation, and

Details Cyclic keto-butyraldehydes a process for their preparation, and Cyclic keto-butyraldehydes a process for their preparation, and

1982-08-23

1985-03-19

Siegel, Alan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453PH, 564448, 521155, 528 75, 528 44, C07C 6900, C08G 1800, C08G 1810

Patent

active

045058601

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.

REFERENCES:
patent: 2692275 (1954-10-01), Bortnick
patent: 3401190 (1968-09-01), Schmitt et al.
patent: 3565954 (1971-02-01), Bouniot
Methoden der Organischen Chemie, (Houben-Weyl) Vierte, Vollig Neu Gestaltete Auglage, Eugen Muller und Otto Bayer, Leverkusen, 1980, (Translation attached).
Patents Abstracts of Japan, Band 3, Nr. 50(C-44), 27., Apr. 1979, Seite 29C44 & JP-A-54 24843 (Mitsubishi Yuka K.K.), 2/24/1979* Zusammenfassung*.

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