Ethyl cyanoacetate → Cyclopropanecarboxylic acid, 1-cyano-2-ethenyl-, ethyl ester

HRID 1649580

Reaktionsgleichung

Reaktionsgleichung von HRID 1649580
[CH2:1](Cl)/[CH:2]=[CH:3]/[CH2:4]Cl.[C:7]([CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11])#[N:8].[Cl-].C(C([NH3+])(C(=O)CCCCCCC)C(=O)CCCCCCC)(=O)CCCCCCC.[OH-].[K+]>C1C=CC=CC=1>[CH:2]([CH:3]1[CH2:4][C:9]1([C:7]#[N:8])[C:10]([O:12][CH2:13][CH3:14])=[O:11])=[CH2:1]

Komponenten

6

Edukt 4

HCID 7764Ethyl cyanoacetateHCID 14797Potassium Hydroxide2×HCID 6421971,4-Dichloro-2-butene, (2E)-HCID 77620884Tricaprylylmethyl ammonium chloride

Produkt 1

HCID 564450Cyclopropanecarboxylic acid, 1-cyano-2-ethenyl-, ethyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 241BenzeneLösungsmittel

Versuchsvorschrift

Ethyl 2-vinyl-1-cyanocyclopropane-1-carboxylate was prepared in accordance with the procedure of U.S. Pat. No. 4,252,739. For the reaction 750 ml benzene, 250 gms (2 moles) 1,4-dichlorobutene-2, 113 gms (1 mole) ethyl cyanoacetate and 3 gms tricaprylylmethylammonium chloride were charged to a reactor and heated to reflux with agitation. Potassium hydroxide (85%) pellets (132 gms; 2 moles) were then added to the stirred solution in small portions. A mild exotherm was observed with the addition of caustic and external cooling was provided as necessary to maintain mild reflux. When the KOH addition was complete the reaction was stirred at reflux for 5 hours while removing water by azeotropic distillation. The reaction mixture was then filtered and the benzene evaporated. Distillation under reduced pressure yielded ethyl 2-vinyl-1-cyanocyclopropane-1-carboxylate (B.p. 55° C. at 0.02 mm Hg, lit. 112° C. at 11 mm Hg.; nD25° 1.4661, lit. nD24° 1.4650).

Aufarbeitung

  1. customEthyl 2-vinyl-1-cyanocyclopropane-1-carboxylate was prepared in accordance with the procedure of U.S
  2. additionwere charged to a reactor
  3. temperatureheated
  4. temperatureto reflux with agitation
  5. additionA mild exotherm was observed with the addition of caustic and
  6. temperatureexternal cooling
  7. customwas provided as necessary
  8. temperatureto maintain mild reflux
  9. temperatureat reflux for 5 hours
  10. customwhile removing water
  11. distillationby azeotropic distillation
  12. filtrationThe reaction mixture was then filtered
  13. customthe benzene evaporated
  14. distillationDistillation under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-47774f62d7ff4788949603f43f3ec69c
Quelldatensatz
uspto-grants-1983_11
Patentnummer
US04418202

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