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YU Qun, XUE Wei xing, WEN Ping, LI Jian yu (College of Chemical Engineering, Beijing Technology and Business University, Beijing 100037, China)  
Determined the dissociation constants of a new β diketone chelating agent 1,3 diphenyl 4 butyrol 5 pyrazolone in water dioxane mixed solvent by potentiometric titration. The value of Ka in water was abtained via extrapoling to zero amount of dioxane: pKa=4 38( t =25±0 1 ℃,I=010).
【CateGory Index】: O656.34
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