Reaktion #2786

Reaktionsgleichung

1,2-dibromoethane

sodium azide

DMF

MeLi

azide

→

off-white solid

Ausbeute 32.0%

1,2-Bis(methyltriazeno)ethane

Ausbeute 32.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeis not evaporated down totally
2. 2
   workup.WAITAfter 3 hr the reaction is worked up
3. 3
   Sonstigeis obtained
4. 4
   SonstigeCrystallization from ether/petroleum ether

Vorschrift

A flask is charged with 5.0 g (27 mmole) of 1,2-dibromoethane, 3.8 g (58 mmole) of sodium azide, and 50 ml of DMF. The mixture is heated at 50° C. with stirring under argon overnight. The mixture is worked up as described above, except that the azide solution is not evaporated down totally. When about 30 ml of solution remains the mixture is treated with 45 ml of a 1.3M solution of MeLi (58 mmole) as above. After 3 hr the reaction is worked up as described above, and a yellow solid is obtained. Crystallization from ether/petroleum ether affords 1.23 g (32% yield) of an off-white solid, mp 64°-6° C. Mass spectra (FAB) Calc (M+H) 145.1201, Found 145.1220±0.0015.

Quelle