(1), the first 62g ethylenediamine and 5.2g sulfur added to the reaction vessel stirring temperature reflux, at 100 slowly drip 6g acetonitrile to control the return flow, drip after the completion of the slow increase in temperature to 150-160 under the reaction for 1 hour, and then batch to add 11g of zinc powder, zinc powder added to the completion of the reaction of the insulation for 2 hours, the final temperature to collect the distillation Collect 190-206 fractions, that is, 2-methylimidazoline;

(2), 4.2g 2-methylimidazoline together with 6.9g potassium carbonate, 4g sodium hydroxide was added to the reaction vessel stirred for 1min, and then add 5.45g of ethylene bromide stirring, the reaction at room temperature for 3 hours, add water 20ml The reaction was carried out for 3 hours at room temperature with the addition of 20ml of water, stirred for 30min, the aqueous layer was extracted with 30ml of chloroform once, and repeated for 3 times. Concentration under reduced pressure gives 1-ethyl-2-methylimidazoline in a yield of 3.4g.