Collision Reactions of Negative Ions in Several Sulfur Compounds and in Their Mixtures with ClCN
摘要:
The formation of the principal negative ions in COS, CS2, H2S, and CH3SH and their collision reactions in mixtures of these compounds with ClCN have been studied. A time-of-flight mass spectrometer fitted with a high pressure source was employed. By comparing ionization efficiency curves for the various resonances occurring, it has been shown that the principal reactions in the above mentioned systems involve attack of S− or HS− on ClCN to yield SCN− and CN−. The rate of formation of CN− is approximately 100 times that of SCN−. Rate constants have been determined for the various reactions.
Photoredox chemistry in the synthesis of 2-aminoazoles implicated in prebiotic nucleic acid synthesis
作者:Ziwei Liu、Long-Fei Wu、Andrew D. Bond、John D. Sutherland
DOI:10.1039/d0cc05752e
日期:——
Prebiotically plausible ferrocyanide–ferricyanide photoredox cycling oxidatively converts thiourea to cyanamide, whilst HCN is reductively homologated to intermediates which either react directly with the cyanamide giving 2-aminoazoles, or have the potential to do so upon loss of HCN from the system. Thiourea itself is produced by heating ammonium thiocyanate, a product of the reaction of HCN and hydrogen
Kinetics and Mechanism of the Nucleophilic Displacement Reactions of Chloroacetanilide Herbicides: Investigation of α-Substituent Effects
作者:Katrice A. Lippa、Sandra Demel、Irvin H. Lau、A. Lynn Roberts
DOI:10.1021/jf030290d
日期:2004.5.1
ease with which alpha-chloroacetanilide herbicides undergo displacement reactions with strong nucleophiles, and their recalcitrance toward weak ones, is intimately related to their herbicidal properties and environmental chemistry. In this study, we investigate the kinetics and mechanisms of nucleophilic substitution reactions of propachlor and alachlor in aqueous solution. The role played by the alpha-amide
Notes. Complexes containing mercury–molybdenum bonds: new compounds of the type [HgX{trans-Mo(CO)<sub>2</sub>L(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)}](L = arsine or phosphine). Crystal and molecular structure of the complex [Hg(CN){trans-Mo(CO)<sub>2</sub>(AsMe<sub>2</sub>Ph)(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)}]
作者:Geoffrey Salem、Brian W. Skelton、Allan H. White、Stanley Bruce Wild
DOI:10.1039/dt9830002117
日期:——
SCN, or S2CNEt2). The molecular structure of the complex [Hg(CN)trans-Mo(CO)2(AsMe2Ph)(η5-C5H5)}] has been determined by single-crystal X-ray analysis. The crystals are monoclinic, space group P21/c, with a= 14.570(4), b= 12.457(3), c= 10.783(3)Å, β= 114.04(2)°, and Z= 4. The structure was solved by heavy-atom methods and refined by least squares to a residual of 0.037 for 2 218 reflections with |I0|
Described are our preliminary studies on the reactivity of thiophosphate in a setting which correlates with the cyanosulfidic systems chemistry we have previously reported. Thiophosphate adds to various nitrile groups giving the corresponding thioamides in a highly efficient manner and the mechanistic implications are briefly discussed. Thiophosphate can also act as a phosphorylating agent, which was
Coordination compounds of hydrazine derivatives with transition metals. XIV. Nickel(II) chelates with bidentate aroylhydrazones and their reactions with heterocyclic bases
作者:M.F. Iskander、S. Saddeck
DOI:10.1016/s0020-1693(00)90911-3
日期:1977.1
neutral bis(ligand)nickel(II) chelates derived from some bidentate aroylhydrazones have been prepared and characterized. Whatever the solubility permits, the reaction of the neutral bis-(ligand)chelates, NiL 2 , with some heterocyclicbases were studied spectrophotometrically in benzene solution. The stability constants as well as the thermodynamic parameters (ΔG, ΔH, ΔS) for the adduct formation reaction