Toluene → alpha-Cypermethrin 1-Epimeric Mixture

HRID 647457

Reaktionsgleichung

[Cl:1][C:2]([Cl:12])=[CH:3][C@@H:4]1[C@H:6]([C:7]([OH:9])=[O:8])[C:5]1([CH3:11])[CH3:10].C(=O)([O-])[O-].[K+].[K+].C1(C)C=CC=CC=1.C1(C)C=CC(S(O[CH:36]([C:50]#[N:51])[C:37]2[CH:42]=[CH:41][CH:40]=[C:39]([O:43][C:44]3[CH:49]=[CH:48][CH:47]=[CH:46][CH:45]=3)[CH:38]=2)(=O)=O)=CC=1>O.[Br-].C([N+](CCCC)(CCCC)CCCC)CCC>[Cl:1][C:2]([Cl:12])=[CH:3][C@@H:4]1[C@H:6]([C:7]([O:9][CH:36]([C:50]#[N:51])[C:37]2[CH:42]=[CH:41][CH:40]=[C:39]([O:43][C:44]3[CH:45]=[CH:46][CH:47]=[CH:48][CH:49]=3)[CH:38]=2)=[O:8])[C:5]1([CH3:10])[CH3:11]

Komponenten

Reaktionsbedingungen

Temperatur: 70 °C

Versuchsvorschrift

Cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid (1680 g, 8.04 M) was added to a solution of potassium carbonate (555 g, 4.02 M) in water (3800 ml). Toluene (7600 ml), tetra-n-butylammonium bromide (115 g, 0.4 M) and alpha-cyano-3-phenoxybenzyl p-toluenesulphonate (2902 g, 7.65 M; prepared as in Example 1(A) above) were added to the stirred mixture which was then heated at 70° C. for 5 hours. The mixture was cooled to ambient temperature and the organic phase was separated off, washed twice with aqueous potassium carbonate solution and twice with water, evaporated and degassed under vacuum to leave cis-alpha-cyano-3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate as a yellow oil (3130 g, 99%), containing less than 1% trans-isomers.

Aufarbeitung

temperatureThe mixture was cooled to ambient temperature
customthe organic phase was separated off
washwashed twice with aqueous potassium carbonate solution and twice with water
customevaporated
customdegassed under vacuum

Quellen und Nachweise

ORD-Eintrag: ord-4add32f706d6482bb574c4d3955c5caa
Quelldatensatz: uspto-grants-1983_10
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US04409150

Verknüpfte Notizen

Wird geladen…