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US 4,906,769 AGranted
Isomerization of 2-pentenoates to 3-pentenoates
AssigneeBASF SE
InventorsRolf Fischer, Franz Merger, Hans-Juergen Gosch
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Abstract
3-pentenoates are prepared by isomerization of 2-pentenoates to 3-pentenoates by a process in which the 2-pentenoate is treated with from 0.01 to 0.5 mole of cyclic tertiary amine having a pK.sub.a of >6 per mold of 2-pentenoate at from 50.degree. to 250.degree. C. and the 3-pentenoate is distilled off continuously.
Claims8
A process for the preparation of a 3-pentenoate by isomerization of a 2-pentenoate to a 3-pentenoate, wherein the 2-pentenoate is treated with a teretiary amine having a pK.sub.a value >6 selected from the group consisting of
- (a) a 5-to-7 membered, heterocyclic tertiary amine which contains 1 to 2 nitrogen atoms or 1 nitrogen atom and 1 oxygen atom in the ring, one or both nitrogen atoms being substituted by alkyl of 1 to 4 carbon atoms,
- (b) 1,8-diazobicyclo[5.4.0]undec-7-ene,
- (c) 1,5-diazobicyclo[4.3.0]non-5-ene, and
- (d) 1,4-diazobicyclo[2.2.2]octane in an amount of from 0.01 to 0.5 mole per mole of 2-pentenoate at from 50.degree.-250.degree. C., and 3-pentenoate is distilled off continuously.
1 more element
Dependencies are inferred from the claim text.