With Organic Mercury Compounds

Diphenyl tellurium dichloride and 3,3-bis[chloromercuro]-2,4-pentadione are reported to form a telluronium salt in dioxane . 

Diaryl tellurium sulfonimides reacted with 1,4-dihydroxybenzene in dry chloroform at 20° Telluronium compounds and sulfonamides were formed.  

Diphenyl 5-Hydroxy-l-phen-2-oxide TeUuronium Zwitterion 0.44 g (4 mmol) of hydroquinone are added to a solution of 1.8 g (4 mmol) diphenyl tellurium 4-methylbenzenesulfonimide in 50 ml anhydrous chloroform. A colorless precipitate separates after 30 min. The mixture is filtered and the filtrate evaporated to dryness under reduced pressure. The solid residue is extracted with 50 ml boiling benzene. The extract is cooled and mixed with 25 m/hexane to precipitate the product, which is recrystallized from benzene/hexane (2 1) yield 60% m.p. 120° 

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Eldefrawi ME, Mansour N, Eldefrawi A. 1977. Interactions of acetylcholine receptors with organic mercury compounds Membrane toxicity. Proceedings of the 9th Annual Rochester International Conference on Environmental Toxicity. Adv Exp Med Biol 84 449-463. 

When the mercury present in the atmosphere is primarily in the form of an organic mercury compound, it may be preferable to utilise an aqueous scmbber. This method is particularly useful for control of emissions from reactors and from dryers. For efficient and economical operation, an aqueous solution of caustic soda, sodium hypochlorite, or sodium sulfide is reckculated through the scmbber until the solution is saturated with the mercury compound. 

A number of analytical methods for the separation of organic mercury compounds use an initial extraction of the organic materials with an organic solvent. Klisenko and Shmigidina [83] then converted both the inorganic mercury held in the aqueous fraction and the organic mercury in the chloroform extract to dithizonate, separated the components on chromatographic columns, and determined the concentration of the various fractions by comparison with reference standards. This method is semi-quantitative at best. 

Ventron A process for removing mercury from aqueous wastes containing organic mercury compounds. Chlorine is passed in, converting organic mercury compounds to inorganic compounds, and the mercury is then reduced to the metallic state with sodium borohydride. 

Polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs), Pentachlorophenol m(PCP, mercury and organic mercury compounds, cadmium, lead and organic lead compounds, brominated flame retardants), nonylphenol/ethoxylates (NP, NPEs) amongst others in the OSPAR Strategy with regard to Hazardous Substances... 

Organic mercury compounds have also been used in latex paint to extend the shelf life, though such uses are currently restricted in the United States following the recognition of this potential hazard to children. Subsequent evaluation of interior rooms of homes painted with mercury-containing latex paint found that mercury vapor concentrations were elevated and in several cases were above the 0.5 pg/m3 concentration recommended by the Agency for Toxic Substances and Disease Registry. 

The behavior of aspartate carbamoylase changed dramatically when the enzyme was treated with the organic mercurial compound p-hydroxymercuribenzoate (see fig. 9.14). The binding of aspartate no longer showed positive cooperativity, and ATP or CTP were without effect. Exposure to mercurials was found to cause the enzyme to dissociate into two types of fragments, one of which retained the enzymatic activity but was no longer affected by CTP or... 

For the reaction of TDI with a polyether triol, bismuth or lead compounds can also be used. However, tin catalysts are preferred mainly because of their slight odor and the low amounts required to achieve high reaction rates. Carboxylic acid salts of calcium, cobalt, lead, manganese, zinc, and zirconium are employed as cocatalysts with tertiary amines, tin compounds, and tin—amine combinations. Carboxylic acid salts reduce cure time of rigid foam products. Organic mercury compounds are used in cast elastomers and in RIM systems to extend cream time, ie, the time between mixing of all ingredients and the onset of creamy appearance. 

At one time, plasmid-encoded resistance to non-chemotherapeutic antibacterials had been almost exclusively studied with inorganic and organic mercury compounds, silver compounds and other cations and some anions [209-212], In brief, it has been shown that ... 

Mercury is a naturally occurring metal that has several forms. Also known as quicksilver because it is a silver-colored liquid at room temperature, mercury is an element that does not break down. It occnrs natnrally and is fonnd in very small amounts in oceans, rocks, and soils. It becomes airborne when rocks erode, volcanoes erupt, and soil decomposes. Mercnry combines with carbon to make organic mercury compounds (methyl mercury).3 3 ... 

A mercury cathode mostly functions only as an electron donor numerous examples of such simple reductions have been reported. In some cases, however, the electrode is attacked with the formation of organic mercury compounds, e.g., by radicals during the reduction of a halide. When using mercury, suitable precautions must be taken to avoid mercury poisoning and environmental pollution. 

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