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Antimony sulfide Tetracene Calcium silicide Lead dioxide Aluminum powder Ground glass Lead hypophosphite Lead peroxide Zirconium Nitrocellulose Pentaerythritol tetranitrate Gum type binder... 

Dissolve 1 g. of powdered benzophenone in 6-7 ml. of cold isopropanol with shaking, add 1 drop of glacial acetic acid, and then confine the solution either in a glass receiver having a ground-glass stopper, or in a tube which is sealed... 

In a 2-1. round-bottomed flask with ground-glass joint (Note 1) are placed 100 g. (0.82 mole) of powdered nicotinamide (Note 2) and 1 1. of c.p. glacial acetic acid, and the mixture is wanned with occasional shaking on a steam bath until a clear solution is obtained. To this mixture is added 160 ml. (1.39 moles) of cold 30% hydrogen peroxide. An air condenser is attached to the reaction flask, and the mixture is heated on a steam bath for 3.5 hours. 

Preparation of Zinc Iodide in Absolute Ether. Assemble an apparatus (see Fig. 119a), replacing dropping funnel 4 with a glass stopper provided with a ground-glass joint. Put 3 g of powdered zinc,... 

In a 4- to 6-L, wide-necked bottle, equipped with a ground-glass stopper, are placed 90 g (0.5 mol) of finely powdered anhydrous D-galactose (200 g, 1.25 md) of powdered... 

Frictionators used include ground glass and aluminum powder (which also acts as a fuel). 

Dipropyl Tellurium Diiodidc1 In a long glass tube are placed 17.45 g (0.1 mol) of 1-iodopropane and 12.0 g (0.1 mol) of powdered tellurium. The tube is closed with a ground-glass stopper, and heated in an oil bath at 85° for 5 days. The hot mixture is then filtered, the black residue is extracted with chloroform, the extract and filtrate are combined, and the solution is evaporated to dryness at 20. The dark oily residue is recrystallized from hexane yield 6.2 g (26%) m.p. 69°. 

While stirring the solution vigorously, slowly add phosphorus pentasulfide (17.8 g, 80 mmol) through a powder funnel. Place the used funnel in the hypochlorite bucket and if any phosphorus pentasulfide sticks to the inside of the ground-glass neck, remove it using a paper towel, which is then put in the hypochlorite bucket. 

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