Diphenyl silver acetate

B. l,l-Diphenyl-2-bromo-Z-acetoxy- -j>ropene. A 250-ml. flask equipped with a condenser is charged with 17.6 g. (0.050 mole) of 1,1-dibromo-2,2-diphenylcyclopropane, 12.5g. (0.075 mole) of silver acetate [Acetic acid, silver(l +) salt] (Note 4), and 50 ml. of glacial acetic acid, then immersed in an oil bath at 100-120° for 24 hours (Note 5). After cooling, the mixture is diluted with 200 ml. of ether and filtered. The ethereal filtrate is washed with two 100-ml. portions of water, two 100-ml. portions of aqueous saturated sodium carbonate, and finally with two 100-ml. portions of water. After drying over anhydrous sodium sulfate, the ether is removed on a rotary evaporator. Distillation of the resulting residue under reduced pressure yields 12.0 g. (72%) of the product, b.p. 142-145° (0.15 mm.), 1.6020-1.6023 (Note 6). 

The reaction with silver acetate produced only diphenyl tellurium and methyl acetate8. 

Lead diphenyl dithiocyanate.—This salt is readily obtained by mixing together aqueous solutions of lead diphenyl acetate and ammonium thiocyanate. It is a white powder, insoluble in water and the usual organic solvents, and is decomposed by silver nitrate, silver thiocyanate being deposited. The salt decomposes at its melting-point. 

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