反应详情

A solution of about 50 g of diethyl-2-bromoethyl-phosphonate in about 255 ml of about 48% hydrobromic acid was kept at reflux (about 95°-100° C.) overnight. The solvent was removed under reduced pressure and the residue evaporated twice with toluene, giving a syrup. This syrup was dissolved in about 65 ml of about 99% ethanol, about 20 g of aniline was added dropwise and the solid was collected, washed with cold about 99% ethanol (at about 0° C.) and dried in vacuo, giving about 30.6 g of the desired reagent, mp 157°-158° C.

1. temperatureat reflux (about 95°-100° C.) overnight
2. customThe solvent was removed under reduced pressure
3. customthe residue evaporated twice with toluene
4. customgiving a syrup
5. customthe solid was collected
6. washwashed with cold about 99% ethanol (at about 0° C.)
7. customdried in vacuo