Reaktion #501266

Reaktionsgleichung

o-trifluoromethylbenzyl alcohol

hydrazoic acid

azodicarboxylic acid diethyl ester

triphenylphosphine

→

o-trifluoromethylbenzyl azide

Lösungsmittel

toluene

toluene

toluene

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe precipitated hydrazinodicarboxylic acid ester is filtered off with suction
2. 2
   Einengenthe toluene solution is concentrated by evaporation
3. 3
   workup.ADDITIONthe residue is treated with cyclohexane
4. 4
   SonstigeThe cyclohexane solution is decanted off from the insoluble portions
5. 5
   Filtrationfiltered through a small amount of silica gel
6. 6
   Einengenconcentrated by evaporation at 50° in vacuo

Vorschrift

First a solution of 17.4 g (0.1 mol) of azodicarboxylic acid diethyl ester in 50 ml of toluene is added dropwise at 10°-20° to a solution of 26.2 g (0.1 mol) of triphenylphosphine in 260 ml of toluene and then, at 5°-10°, a solution of 17.6 g (0.1 mol) of o-trifluoromethylbenzyl alcohol in 120 ml of a 1N solution of hydrazoic acid in toluene is added dropwise thereto and the whole is stirred at room temperature for 2 hours. The precipitated hydrazinodicarboxylic acid ester is filtered off with suction, the toluene solution is concentrated by evaporation and the residue is treated with cyclohexane. The cyclohexane solution is decanted off from the insoluble portions, filtered through a small amount of silica gel and concentrated by evaporation at 50° in vacuo. In this manner o-trifluoromethylbenzyl azide is obtained in the form of a colourless liquid.

Quelle