Diazomethane → 5-Bromo-1-diazo-3-(3,4-dichlorophenyl)-2-pentanone

Beteiligte Stoffe

Reaktionsschritte

Prepare a solution of diazomethane from 15 g of MNNG by reaction with 45 ml of 40% aqueous KOH topped with 150 ml. of Et2O and cool in an ice bath. Add an Et2O solution (40 ml.) of the product of Step 3 (8.2 g, 5 24.8 mmoles) in small volumes, stir the solution in the ice bath for 15 min, then heat to reflux for 30 min. Remove the solvent in vacuo. Purify the resulting mixture by flash chromatography on silica gel using CH2Cl2 as eluent. Yield: 7.0 g (IR: 2100 cm-1, 1630 cm-1).

Herkunft & Nachweise