phosphorus trichloride has been found to give thiophosphoryl chlorides, and phosphoryl oxychloride—the products of the exclusive deoxygenation of sulphenyl chloride. Optically active phosphonochloridothionates and phosphorochloridothionates in a high state of optical purity have been obtained with inversion of configuration from optically active sulphenyl chlorides and phosphorus trichloride. It has been
Kinetics and Mechanism of Anilinolyses of Ethyl Methyl, Ethyl Propyl and Diisopropyl Chlorothiophosphates in Acetonitrile
作者:Hasi Rani Barai、Md. Ehtesham Ul Hoque、Hai Whang Lee
DOI:10.5012/bkcs.2013.34.12.3811
日期:2013.12.20
methyl (2), ethyl propyl (4) and diisopropyl (7) chlorothiophosphates with substituted anilines and deuterated anilines are investigated kinetically in acetonitrile at . A concerted mechanism is proposed based on the selectivity parameters. The deuterium kineticisotope effects (DKIEs; ) are secondary inverse () with 2, primary normal and secondary inverse () with 4, and primary normal () with 7. The
Kinetics and Mechanism of Anilinolyses of Aryl Methyl and Aryl Propyl Chlorothiophosphates in Acetonitrile
作者:Hasi Rani Barai、Hai Whang Lee
DOI:10.5012/bkcs.2014.35.9.2797
日期:2014.9.20
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 $55.0^\circ}C$. A concerted mechanism is proposed for 8 based on the negative $\rho}_XY}$ (= -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 $\rho}_XY}$ (= +0.68) value. The deuterium kinetic isotope effects (DKIEs; $k_H/k_D$) 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.
Kinetics and Mechanism of Pyridinolyses of Aryl Methyl and Aryl Propyl Chlorothiophosphates in Acetonitrile
作者:Hasi Rani Barai、Hai Whang Lee
DOI:10.5012/bkcs.2014.35.2.483
日期:2014.2.20
Constants ( k 2 × 10 3 /M –1 s –1 ) at 35.0 o C, NBO Charges at the Reaction Center P Atom,Summations of the Steric Constants and Selectivity Parameters ( X and XY ) for the Reactions of 1 - 11 with X-Pyridines in MeCNno R 1 OR 2 O k 2 × 10 3 a charge at P – ES X e XY 1 MeOMeO 1.54 c 1.687 0 1.09/0.20 –2MeOEtO 0.620 1.693 0.07 1.50/0.43 – 3 EtOEtO 1.19 c 1.701 0.14 1.02/0.29 –4EtO PrO 0.609
14/–1.02/–0.04 fa 35.0 o C 时 X = H 的值。 b Y = H 的值。 c 外推值。d 经验动力学数据。e 强/弱碱性吡啶。