Cyclohexene → Dimethyl bicyclo[4.1.0]heptane-7,7-dicarboxylate

HRID 893240

Reaktionsgleichung

Reaktionsgleichung von HRID 893240
[CH:1]1[CH2:6][CH2:5][CH2:4][CH2:3][CH:2]=1.[N+](=[C:9]([C:14]([O:16][CH3:17])=[O:15])[C:10]([O:12][CH3:13])=[O:11])=[N-]>CC(CC(C)=O)=O.CC(CC(C)=O)=O.[Cu]>[CH:1]12[C:9]([C:14]([O:16][CH3:17])=[O:15])([C:10]([O:12][CH3:13])=[O:11])[CH:6]1[CH2:5][CH2:4][CH2:3][CH2:2]2

Komponenten

4

Edukt 2

HCID 8079CyclohexeneHCID 5476732-Diazonio-1,3-dimethoxy-3-oxoprop-1-en-1-olate

Produkt 1

HCID 283676Dimethyl bicyclo[4.1.0]heptane-7,7-dicarboxylateAusbeute 57,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 45052134Bis(pentane-2,4-dione-kappa~2~O~2~,O~4~)copperKatalysator

Versuchsvorschrift

To stirred, refluxing mixture of 100.0 grams (1.22 mole) of cyclohexene and 0.037 gram (0.0001 mole) of cupric acetylacetonate was fed 22.7 grams (0.14 mole) of dimethyl diazomalonate over a 25-hour period by means of a syringe pump. Refluxing was continued for an additional 8 hours after which distillation of the reaction mixture was begun, employing a small Vigreux column. After removing about 32 grams of cyclohexene overhead, to a head temperature of 80° C., the residue was allowed to cool. The solidified residue was worked up by flash column chromatography on silica gel to give 17.53 grams (0.08 mole) of dimethyl bicyclo[4.1.0]heptane-7.7-dicarboxylate having a melting point of 83° C.-86° C.

Aufarbeitung

  1. temperaturerefluxing
  2. customover a 25-hour
  3. temperatureRefluxing
  4. distillationafter which distillation of the reaction mixture
  5. customAfter removing about 32 grams of cyclohexene overhead
  6. customto a head temperature of 80° C.
  7. temperatureto cool

Quellen und Nachweise

ORD-Eintrag
ord-c97ada6c59c44745a46aaa8a60314933
Quelldatensatz
uspto-grants-1992_06
Patentnummer
US05123951

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