Kinetics of the Solvolyses of Benzhydryl Derivatives: Basis for the Construction of a Comprehensive Nucleofugality Scale
作者:Bernard Denegri、André Streiter、Sandra Jurić、Armin R. Ofial、Olga Kronja、Herbert Mayr
DOI:10.1002/chem.200500845
日期:2006.2.8
series of 21 benzhydrylium ions (diarylmethylium ions) are proposed as reference electrofuges for the development of a general nucleofugality scale, where nucleofugality refers to a combination of leaving group and solvent. A total of 167 solvolysis rate constants of benzhydrylium tosylates, bromides, chlorides, trifluoroacetates, 3,5-dinitrobenzoates, and 4-nitrobenzoates, two-thirds of which have been
提出了一系列21个苯甲鎓离子(二芳基甲基鎓离子)作为参考电熔剂,用于开发一般的核易性规模,其中核易性是指离去基团和溶剂的组合。甲苯磺酸苄酯,溴化物,氯化物,三氟乙酸盐,3,5-二硝基苯甲酸酯和4-硝基苯甲酸酯的共167个溶剂分解速率常数,在这项工作中已确定其中三分之二,根据相关方程log k(25摄氏度)= sf(Nf + Ef),其中sf和Nf是核反应堆特定的参数,Ef是电堆特定的参数。尽管以这种方式表征的核熔剂和电熔剂覆盖了12个数量级以上,但是只有一组参数,即sf,Nf和Ef,足以计算出25°C时的溶剂分解速率常数,精度为+/- 16%。到目前为止,由于所有核因子的sf大约为1,即离开基团/溶剂的组合,因此对核官能度的定性讨论可以基于Nf。