Guanidine triphenyl

Carbon Tetrachloride,1 —This compound, when decomposed-alone by an arrangement similar to that used for chloroform, gives off great quantities of chlorine perchlorbenzene, perchlor-ethane (in very trifling quantity), and perchlorethylene are also produced. The presence of water in this case also increases the yield of carbon monoxide. Aniline leads to triphenyl-guanidine, some resin being also formed. 

Triphenyl Guanidine.- The residue remaining in the flask after the distillation with hydrochloric acid is treated with 100 c.c. of water, and then allowed to stand for several hours, when colourless crystals of triphenylguanidine hydrochloride separate out. These are filtered off, and warmed with some dilute caustic soda solution. The salt is decomposed, and the free base obtained, which on recrystallising from alcohol forms colourless crystals. Melting-point, 1430. 

Recently, this method was used to prepare pseudourea derivatives, which have herbicidal properties ( ). In the reaction of XXXV with aniline, complete substitution occurs with formation of triphenyl-guanidine ( ). 

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