decomposes at 182 °C
|metriol trinitrate||molecular mass
Metriol trinitrate, also called MTN; 1,1,1-trimethylolethane trinitrate; nitropentaglycerin; 1,3-propanediol, 2-methyl-2-[(nitrooxy)methyl]-, dinitrate (ester); 2-Methyl-2-hydroxymethyl-1,3-propanediol trinitrate; and metriolo in Italian, was first prepared and patented by the Bombrini-Parodi-Delfino Co of Italy under the name Metriolo. The Germans got wind of Metriolo before WWII and saw that it was a good flash and erosion reducing agent, so they began to manufacture it. Metriol trinitrate is a powerful liquid explosive that is somewhat sensitive to explosion, about as much as nitroglycerin. It has been used as a flash and corrosion reducing additive in propellants and as an ingredient in commercial explosives.
|calcium chloride||Erlenmeyer flask|
|ethyl ether||graduated cylinder|
Prepare a mixture of 50 mL of concentrated (>90%) nitric acid and 20 mL of concentrated (>90%) sulfuric acid in a small Erlenmeyer flask, and cool to 20 °C in a salt-ice bath. Carefully add 3.5 g of metriol to the flask while maintaining a temperature of 20 °C. The mixture is stirred for 30 minutes after the addition, then cooled to 5 °C, and finally poured over ice. The solution is extracted with ethyl ether, the extract is washed with water, and the wash is adjusted to pH 7 by shaking with sodium bicarbonate solution, then washed with water three more times. It is then dried with calcium chloride, poured over a filter to remove impurities, and freed of ethyl ether by bubbling with dry air until a constant weight is obtained. Yield is about 88%. You will need a graduated cylinder for measuring liquids, a stirring rod or magnetic stirrer for mixing, and a thermometer to monitor the temperature.
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