Guo Li
2008
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Journal
Chinese Journal of Applied Chemistry
Abstract
The effect of acidity on the synthesis of phenylbiguanide from the additive reaction of aniline with dicyandiamide was studied.Under low acidity conditions,the reaction rate was increased with the increase in acidity,and reaches the maximum value at pH=2.5.When the acidity was increased,the reaction rate was gradually decreased.The acid-base equilibration of aniline and dicyandiamide was calculated,it shows that when pH2.5,the increasing of the concentration of protonated dicyandiamide made the dominant effect and increased the reaction rate.When pH2.5,the aniline molecule integrated with H+,and the decreasing of nucleophile gave a dominant effect,which decreased the reaction rate.It also shows that dicyandiamide may hydrolyze when pH3.5,and it is proved by IR,13C NMR and elemental analysis that the by product is guanylurea.