Preparation of formylvalerates

Details Preparation of formylvalerates Preparation of formylvalerates

C - Chemistry, Metallurgy

07

C

260/488, 202/94

C07C 69/716 (2006.01) C07C 69/67 (2006.01)

Patent

CA 1140943

Abstract of the Disclosure An improved process for the preparation of alkyl formyl- valerates, wherein butadiene of a butadiene-containing hydro- carbon mixture is reacted, in a first stage, with carbon monoxide and alkanols in the presence of cobalt carbonyl complexes and, per mole of butadiene, from 0.5 to 2 moles of tertiary nitrogen bases having a pKa of from 3 to 11, at from 80 to 150°C and from 400 to 2,000 bar, and, in a second stage, the resulting alkyl pentenoate is reacted with carbon monoxide and hydrogen in the presence of cobalt carbonyl complexes at from 100 to 160°C and from 100 to 300 bar, the improvement being that the tertiary nitrogen bases, excess alkanols and any unconverted hydrocarbons are distilled off from the reaction mixture obtained in the first stage, with the proviso that the reaction mixture is treated, before or during the distillation, with gases containing mole- cular oxygen, and the residual reaction mixture contain- ing alkyl pentenoate and cobalt catalyst is used in the second stage.

364443

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