Claims
- 1. 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.
- 2. A process as claimed in claim 1, wherein the isomerization is carried out at from 100.degree. to 160.degree. C.
- 3. A process as claimed in claim 1, wherein from 0.02 to 0.2 mole of tertiary amine is used per mole of 2-pentenoate.
- 4. A process as claimed in claim 1, wherein the tertiary amine used has a boiling point higher than that of the particular 3-pentenoate prepared.
- 5. The process of claim 1, wherein the tertiary amine is
- (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.
- 6. The process of claim 1, wherein the tertiary amine is
- (b) 1,8-diazobicyclo[5.4.0]undec-7-ene.
- 7. The process of claim 1, wherein the tertiary amine is
- (c) 1,5-diazabicyclo[4.3.0]non-ene.
- 8. The process of claim 1, wherein the tertiary amine is
- (d) 1,4-diazobicyclo[2.2.2]octane.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3640597 |
Nov 1986 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 07/122,941, filed on Nov. 18, 1987.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4327225 |
Isogai et al. |
Apr 1982 |
|
4788326 |
Hoelderith |
Nov 1988 |
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4791220 |
Fischer |
Dec 1988 |
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Foreign Referenced Citations (3)
Number |
Date |
Country |
0269043 |
Jun 1988 |
EPX |
0269046 |
Jun 1988 |
EPX |
0269078 |
Jun 1988 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
122941 |
Nov 1987 |
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