Kinetics and Mechanism of Anilinolyses of Aryl Methyl and Aryl Propyl Chlorothiophosphates in Acetonitrile†

Bulletin of the Korean chemical society

Hai Whang Lee¹  Hasi Rani Barai¹ 

关键词: Thiophosphoryl transfer reaction;    Anilinolysis;    Y-Aryl methyl and Y-aryl propyl chlorothiophosphates;    Deuterium kinetic isotope effect;    Cross-interaction constant;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Nucleophilic substitution reactions of Y-aryl methyl (8) and Y-aryl propyl (10) chlorothiophosphates with substituted anilines and deuterated anilines are investigated kinetically in acetonitrile at 55.0 oC. A concerted mechanism is proposed for 8 based on the negative ρXY (= –0.23) value, while a stepwise mechanism with a rate-limiting leaving group departure from the intermediate is proposed for 10 based on the positive ρXY (= +0.68) value. The deuterium kinetic isotope effects (DKIEs; kH/kD) are 0.89-1.28 and 0.62-1.20 with 8 and 10, respectively. Primary normal and secondary inverse DKIEs are rationalized by a frontside attack involving hydrogen bonded, four-center-type transition state and backside attack involving in-line-type transition state, respectively.

【 授权许可】

Unknown