Reaktion #95457

Reaktionsgleichung

triethyloxonium tetrafluoroborate

epichlorohydrin

boron trifluoride etherate

1-methyl-2-pyridone

→

Triethyloxonium fluoroborate

2-ethoxy-1-methylpyridinium fluoroborate

Ausbeute 71.0%

Lösungsmittel

methylene chloride

ether

ether

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent is evaporated at room temperature, in vacuo
2. 2
   Sonstigethe quaternary salt obtained
3. 3
   Sonstigeis recrystallized from methanol-ether (1:1)

Vorschrift

Triethyloxonium fluoroborate is prepared from 3.70 g (0.040 mole) of epichlorohydrin in 14 ml of ether and 7.58 g (0.054 mole) of boron trifluoride etherate in 6 ml of ether. The resulting solid triethyloxonium tetrafluoroborate is dissolved in 20 ml of dry methylene chloride and treated under nitrogen with 4.36 g (0.040 mole) of 1-methyl-2-pyridone in 15 ml of methylene chloride. The reaction mixture is stirred under nitrogen at room temperature overnight (about 16 hours). The solvent is evaporated at room temperature, in vacuo and the quaternary salt obtained is recrystallized from methanol-ether (1:1) to give 8.0 g (71%) of 2-ethoxy-1-methylpyridinium fluoroborate, m.p. 58°-60° C.

Quelle