Carbon Dioxide → 4-t-Butylazo-4-cyanopentyl chloroformate

Beteiligte Stoffe

Reaktionsschritte

To 15 ml of liquid phosgene in a 50 ml round bottom flask, equipped with a thermometer, magnetic stirring bar, dry ice condenser and dropping funnel, was added 5 g. (0.0254 m) of 2-t-butylazo-2-cyano-5-hydroxypentane (from XIV) over 1 hour, holding the temperature at 0° C with an ice bath. After the addition was complete, the reaction was stirred an additional 11/2 hours, letting the temperature slowly rise to room temperature. The dry ice condenser was removed and the excess phosgene stripped off with a water aspirator. The chloroformate was taken up in pentane, dried over anhydrous Na2SO4, filtered and the pentane stripped off to give 5.4 g. (82% yield) of 4-t-butylazo-4-cyanopentyl chloroformate which assayed 92.4%.

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