Effects of pure AcOH and mixed AcOH-CS (CS = CH3CN and THF) solvents on the rate of cleavage of phthalic anhydride (PAn)

被引:0
|
作者
Damit, Emmy Fadhiza [1 ]
Yusof, Nor Saadah M. [1 ]
Ariffin, Azhar [1 ]
Khan, M. Niyaz [1 ]
机构
[1] Univ Malaya, Dept Chem, Fac Sci, Kuala Lumpur 50603, Malaysia
关键词
Phthalic anhydride (PAn); Rate of acetolysis of PAn; Kinetic study; Delta H* and Delta S* for acetolysis; Effects of mixed glacial acetic acid-CS solvents (CS = CH3CN and THF); IONIZED PHENYL SALICYLATE; AQUEOUS-ORGANIC-SOLVENTS; CATIONIC MICELLES; MECHANISM; KINETICS; ACID; CYCLIZATION;
D O I
10.1007/s13738-012-0084-5
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The values of pseudo-first-order rate constants (k (obs)) for the acetolysis of phthalic anhydride (PAn) increase from 6.60 x 10(-7) to 31.5 x 10(-7) s(-1) with the increase in temperature from 30 to 50 A degrees C. These values of k (obs) give activation parameters a dagger H* and a dagger S* as 14.4 +/- A 0.4 kcal mol(-1) and -39.1 +/- A 1.3 cal K-1 mol(-1), respectively. The values of k (obs) remain essentially unchanged with the increase in the content of CS (CS = CH3CN or THF) from 0 to 40 % v/v in mixed AcOH-CS solvents. These observations have been explained qualitatively.
引用
收藏
页码:723 / 727
页数:5
相关论文
共 11 条