Di-n-butylmagnesium

1, the preparation of sec-butylmagnesium chloride

To the 250mL four-necked flask equipped with a stirrer, dropping funnel, thermometer, nitrogen introduction tube and reflux condenser (on the drying tube) through nitrogen, add a certain amount of magnesium powder with a small amount of iodine stirring, and slowly heating. When the iodine partially sublimated, add a small amount of 2-chlorobutane ether solution, the reaction triggered by the remaining 2-chlorobutane ether solution through the dropping funnel slowly dripping, dropping time of about 1h. After the reaction was completed, the reaction was left to stratify, and the upper layer of the clear liquid was taken as sec-butylmagnesium chloride, and the magnesium content was determined by titration method and the yield was calculated.

2, the preparation of dibutyl magnesium

To the 250mL four flasks equipped with stirrer, nitrogen introduction tube, thermometer and reflux condenser (on the drying tube), add the reaction generated by the above sec-butylmagnesium chloride clear liquid, open the stirring, rapid addition of n-butyllithium hexane solution, the addition of finished to continue to react for 20min or so, the reaction is complete, static stratification, take the upper layer of clear liquid with potentiometric titration. The upper layer of the clear liquid with potentiometric titration to analyze the content of chloride ions, calculate the yield of dibutyl magnesium.