Showing papers on "Organomercury Compounds published in 1978"

Preparation and vibrational spectra of tetra-n-propylammonium carbonyldichloro-organoplatinate(II) salts, and a comparison of their carbon-13 and platinum-195 nuclear magnetic resonance properties with those of organomercury compounds

Abstract: Salts, [NPrn4][PtCl2R (CO)](R = Me, Et, Prn, Pri, Bun, or Ph), have been prepared from the reaction of [NPrn4]2-[Pt2Cl4(CO)2] with HgR2, but derivatives with R = But, C2H3, or C3H5 could not be obtained. Infrared and Raman spectra are reported and discussed. The 1H, 13C, and 1H-{195Pt} INDOR spectra have been investigated. The behaviours of 1J(PtC) and δ(195Pt) are discussed with reference to the 13C parameters and δ(199Hg) of the mercury compounds, [HgX(R)](X = Cl, Br, I, or R).

Replacement of mercury by gold in organomercury compounds

Abstract: 1. A method has been developed for the synthesis of organogold compounds of the aryl, alkenyl, cymantrenyl, and heterocyclic series from organomercury compounds. 2. Either binuclear cationic complexes of gold with the general formula [R(AuPPh3)2]BF4 or monogold organic compounds with the general formula RAuPPh3 form, depending on the nature of the radial in the organomercury compound. 3. Previously unknown organogold compounds with the general formula RAuPPh3 have been obtained from the binuclear cationic complexes of gold under the action of triphenylphosphine.

On the mechanisms of substitution reactions of organometallic compounds of nontransition metals

Abstract: The present paper describes results of studies of two types of substitution reactions (mainly of organomercury compounds): R n M + M' → R m M' and R n-p EX p + E — X m → R m-q M‘X q (E = M’, Hal or H). Various organomercury compounds readily enter into isotopic exchange reactions with 203 Hg. Highly unstable “organic calomels” apparently are intermediates in these exchange reactions. Compounds having platinum-mercury bonds are shown to be the first stage product in the reaction between zerovalent platinum complexes and organomercury compounds. S E 2, S E 1 (N) and S E 2(i.p.) mechanisms are discussed.

Complexing treatment efficacy as measured by methyl mercury distribution and toxic signs

Abstract: . . . . . . . . . . . . . . . ». . . . . . . . . . . , viii

Aspects of Mercury(II) Thiolate Chemistry and theBiological Behavior of Mercury Compounds

Abstract: Complex formation between mercury compounds and thiols, e.g. cysteine, is believed to play a major role in the biological chemistry of mercury. The greater affinity of Hg(II) and MeHg(II) for thiols than other possible biological donor ligands has been well documented by stability constant studies in aqueous solution. Our interest in mercury(II) thiolates stems from studies of the chemistry of the antidote British anti-Lewisite which indicated that the structure and reactivity of simple thiolate complexes was little understood. In this review our recent work on the interaction of inorganic and organomercury compounds with British anti-Lewisite, simple thiols and sulphur containing amino acids is discussed, followed by an account of animal studies of the distribution and metabolism of phenylmercury compounds. In discussing the implications of chemical results, e.g. reactivity of thiolates, for the biological behaviour of mercury compounds it is assumed here that chemical studies provide only plausible pathways for biological behaviour.

Studies on Formulation and Residue Analysis of Pesticides

Abstract: The dithizone method was applied for the determination of total mercury and organomercury in organomercury fungicides. Paper chromatography was applied for separation and identification of organomercury compounds in fungicide formulation. Gas chromatography with thermal conductivity detector was applied for the determination of D-D, EDB, DBCP, chloropicrin, DDVP, aldrin, dieldrin, chlorobenzilate, BHC isomers, nicotine sulfate, diazinon, heptachlor, VC-13, 2, 4-D ethyl ester, PCP, DBN, DCPA and PCNB in those formulation.An improved A. O. A. C. method by dithizone was applied for the determination of mercury residues in rice grains, fruits and tea leaves treated with organomercury fungicides. The amounts of mercury residues in raw rice grains treated with fungicide ranged from 0.04 to 0.84ppm, and influenced by mainly the lapse days after application. About 60% of mercury residues in raw rice grains was found in pollished grains and remaining 40% was in bran. The more high water solubility and hardly dissociated into ions the compounds has, the more uptake of mercury by rice plant from soil treated with those mercury compounds. Subsequently gas chromatography with electron capture detector was applied for the determination of organochlorine insecticides residues in various crops. The amounts of total BHC residues in raw rice grains treated with BHC dust ranged from 0.41 to 1.42ppm. Afterwards, from the similar purpose, on the relationship between the amounts of DDT and its derivatives residues in rice grains and apples and the history of application were examined under the field conditions.At finally, the biological concentration ratio (BCR) of the fourteen pesticides by fresh water fish, topmouth gudgeon were determined at the equilibrium condition under the continuous flow water system containing about 10ppb of those pesticides. These BCR obtained by this experiment were correlated to the octanol/water partition coefficient of individual compounds and inversely proportional to the water solubility. Therefore, it is able to predict the biological concentration potential of pesticide by means of these two physicochemical properties.

The electrochemical reduction of boromercurated carboranes

Abstract: 1. Polarographic reduction potentials for various boromercurated carboranes have been measured and used to show that the potential required for reduction of the B-Hg bond is much higher than that required for reduction of the C-Hg bond in the carborane analogs. The mercurated carboranes resemble the alkyl and aryl organomercury compounds. 2. Reduction of the B-Hg bond proceeds more readily in the p-carborane than in either the o- or the m-carboranes, this being the result of the presence of a neighboring electron-deficient carbon in the first type of molecule.

Preparation and vibrational spectra of tetra-n-propylammonium carbonyldichloro-organoplatinate(ii) salts, and a comparison of their carbon-13 and platinum-195 nuclear magnetic resonance properties with those of organomercury compounds

Abstract: Salts, [NPrn4][PtCl2R (CO)](R = Me, Et, Prn, Pri, Bun, or Ph), have been prepared from the reaction of [NPrn4]2-[Pt2Cl4(CO)2] with HgR2, but derivatives with R = But, C2H3, or C3H5 could not be obtained. Infrared and Raman spectra are reported and discussed. The 1H, 13C, and 1H-{195Pt} INDOR spectra have been investigated. The behaviours of 1J(PtC) and δ(195Pt) are discussed with reference to the 13C parameters and δ(199Hg) of the mercury compounds, [HgX(R)](X = Cl, Br, I, or R).

Organomercury compounds. xxiii. organomercuric quinolin‐8‐olates

Abstract: Die Chinolinolato-Hg-Chelatkomplexe (I) werden durch Umsetzung von fluorierten Phenyl- Hg-chloriden mit Tl-chinolinolat oder von Methyl- bzw. Phenyl-HgOH mit Chinolinol oder seinem 2-Methyl-Derivat in Methanol dargestellt.

Organomercury compounds in organic synthesis

Abstract: I. Introduction.- References.- II. Preparation of Organomercury Compounds.- A. Introduction.- B. Direct Mercuration of Organic Halides.- C. Organomagnesium and -Lithium Procedures.- D. Organoboranes.- E. Other Transmetallation Reactions.- F. Mercuration of Carbon Monoxide.- G. Mercury Substitution in Activated C-H Containing Compounds.- H. Mercuration of Cyclopropanes.- I. Mercuration of Alkenes.- J. Mercuration of Alkynes.- K. Mercuration of Aromatic Compounds.- L. Mercury Substitution in Aryldiazonium Salts, Hydrazines, Hydrazones, and Diazo Compounds.- M. Decarboxylation of Mercury Carboxylates.- N. Sulfinate and Sulfonate Elimination Reactions.- References.- III. Hydrogen and Halogen Substitution.- A. Hydrogen Substitution.- B. Halogen Substitution.- References.- IV. Synthesis of Heteroatom-Containing Compounds.- A. Introduction.- B. Oxygen Compounds.- C. Sulfur, Selenium, and Tellurium Compounds.- D. Nitrogen Compounds.- E. Phosphorus Compounds.- F. Silicon Compounds.- G. Conclusion.- References.- V. Dimerization.- References.- VI. Alkylation.- References.- VII. Alkene and Alkyne Addition and Substitution Reactions.- References.- VIII. Carbonylation.- References.- IX. Acylation.- References.- X. Divalent Carbon Transfer Reactions.- A. Introduction.- B. Preparation of the Reagents.- C. Synthesis of Cyclopropanes.- D. Organomercurial Reactivity.- E. Mechanism of Cyclopropane Formation.- F. Synthesis of Cyclopropenones.- G. Ring Expansion Reactions.- H. Reactions with Oxygen, Nitrogen and Sulfur Compounds.- J. Insertion Reactions in Metal-Carbon, Metal-Halide and Metal-Metal Bonds.- References.- Subject Inde.