Reaktionsgleichung
[CH3:1][O:2][C:3](=[O:10])[CH2:4][C:5]1[S:6][CH:7]=[CH:8][CH:9]=1.[C:11](OC(=O)C)(=[O:13])[CH3:12].OP(O)(O)=O>>[CH3:1][O:2][C:3](=[O:10])[CH2:4][C:5]1[S:6][C:7]([C:11](=[O:13])[CH3:12])=[CH:8][CH:9]=1Komponenten
4
Versuchsvorschrift
A mixture of 2-thienylacetic acid methyl ester, 1.41 g. (0.01 mol) and acetic anhydride, 4.2 g. (0.04 mol) was heated at 70°-80° C. and 0.2 g. of 85% H3PO4 was added dropwise with mechanical stirring. The reaction was somewhat exothermic but cooling was not necessary. The mixture was maintained between 70°-80° C. for 3 hrs., and then, poured onto ice-water followed by extraction with ether. Organic layer was washed with water several times, dried over anhyd. MgSO4 and evaporated. The residue was distilled at 2 mmHg and a fraction between 160° C. and 172° C. was collected. This material was gradually crystallized and could be recrystallized from the mixture of light-petroleum and benzene. m.p. 43°-44° C. Yield; 1.39 g. (76.5%)
Aufarbeitung
- temperature(0.04 mol) was heated at 70°-80° C.
- temperaturecooling
- temperatureThe mixture was maintained between 70°-80° C. for 3 hrs
- addition, and then, poured onto ice-water
- extractionfollowed by extraction with ether
- washOrganic layer was washed with water several times
- customdried over anhyd
- customMgSO4 and evaporated
- distillationThe residue was distilled at 2 mmHg
- customa fraction between 160° C. and 172° C. was collected
- customThis material was gradually crystallized
- customcould be recrystallized from the mixture of light-petroleum and benzene
Quellen und Nachweise
- ORD-Eintrag
- ord-89e78a7c19bc445aae9b3eedbdd1325f
- Quelldatensatz
- uspto-grants-1978_12
- Patentnummer
- US04130566
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