Methanol → HCID 178437965, compound

Participants

Reaction Steps

380 mg (2 mmol) of triethyloxonium tetrafluoroborate are dissolved in 15 ml of methylene chloride. 326 mg (2 mmol) of p-dimethylaminoacetophenone are added thereto at -15°. After 5 minutes there are added thereto at the same temperature 162 mg (1 mmol) of 1,3-diamino-2-ethyl-imidazolium chloride and the mixture is stirred at -10° for 1 hour and at 0° for 2 hours. After the addition of a small amount of methanol the mixture is evaporated and the residue is placed on a column loaded with 10 g of silica gel. The product is eluted with chloroform/methanol (87:13 parts by weight) and crystallized using ether. The crystallizate is dissolved in 80 ml of water, placed on a column loaded with ion exchanger Amberlite IRA 400 (chloride) and elution is carried out with water. The eluate is evaporated and the residue is crystallized from ethanol/water. There is obtained 3-amino-1-[[p-(dimethylamino)-α-methylbenzylidene]amino]-2 -ethylimidazolium chloride of melting point 223°-225°.

Provenance & Evidence