Transition Metal Chemistry p. 587 - 594 (2015)
Update date:2022-08-17
Topics:
Asghar, Basim H.
Altass, Hatem M.
Fawzy, Ahmed
Abstract Kinetic investigations of Pt(IV) oxidation of l-asparagine catalyzed by transition metals with different valencies, namely Ag(I), Pd(II), Cr(III) and Zr(IV), were studied spectrophotometrically in sulfuric acid medium at constant ionic strength and temperature. The reaction was first order in [Pt(IV)], while the orders with respect to the concentrations of Asn, sulfuric acid and transition metal were less than unity over the concentration range studied. The rate constants decreased with increasing ionic strength and dielectric constant, while increasing temperature enhanced the rate. The order of catalytic efficiency was: Ag(I) > Cr(III) > Pd(II) > Zr(IV). A mechanism involving the formation of a complex between the catalyst and substrate is proposed. Oxidation by Pt(IV) is suggested to take place by an inner-sphere mechanism in which Pt(IV) is reduced to Pt(II) on the catalyst-bound substrate in a one-step two-electron transfer process. The oxidation products of Asn were identified as α-formyl acetamide, ammonium ion and carbon dioxide. The rate law associated with the reaction mechanism was deduced. Activation parameters of the reactions were evaluated and discussed.
View MoreJinan Hongfangde Pharmatech Co.,Ltd
Contact:86-531-88870908
Address:F Bldg. West Unit North Area of Univ. Tech. Garden Xinyu Rd. Jinan New & High Tech Industry Development Zone Shandong, China
Shanghai ZaiQi Bio-Tech Co., Ltd.,
Contact:+86-21-6722 0633
Address:Bldg. No.7, No.201 MinYi Rd,Songjiang CaoHeJing High-Tech Park Shanghai 201516 P,R,China
Jinan Trio PharmaTech Co., Ltd
Contact:86-531-88811783;+(0)13153010282
Address:2766 Yingxiu Road, Jinan High-Tech Zone, China
Shanghai Kangxin Chemical Co., Ltd
Contact:+86 21 60717227
Address:118,Ganbai Village,Waigang Town,Jiading District,Shanghai
TIANJIN GST CHEMICAL TECHNOLOGY CO., LTD
Contact:+86-22-25210964
Address:Room. 208, No. -12-C, No. 13, Xinbei Road, Tanggu District, New Haixin Area, Tianjin City, China
Doi:10.1016/S0040-4020(01)82768-X
(1969)Doi:10.1021/jo00323a045
(1981)Doi:10.1007/BF03343817
(1953)Doi:10.1039/d0gc02168g
(2020)Doi:10.1021/acs.orglett.6b01539
(2016)Doi:10.1007/s10534-015-9870-8
(2015)