Mercury compounds transition metal salts

Diorgano ditellurium compounds react with transition metal salts and carbonyl complexes to form coordination compounds (Table 5, p. 283). Complexes with the following transition metals have been reported Ti, Cr, Mo, W, Mn, Re, Fe, Ir, Ni, Pd, Pt, Cu, Ag, Cd, Hg, Yb, and U. In many of these complexes, the organyltelluro group bridges the metal atoms in binuclear complexes. The Te —Te bond seems to remain intact upon complexation to mercury halides, rhenium carbonyls, and uranium pentachloride. For details on tellurolatO bridged complexes see p. 212. Complexes with SnCl are also known. Diphenyl ditellurium and bis[4-ethoxyphenyl] ditellurium formed charge-transfer complexes when equimolar amounts of the ditellurium compound and tetracyano-p-quinodime-thane were refluxed in acetonitrile. ... 

There are three important routes to the formation of the mercury-transition metal bond (a) displacement of halogen or pseudohalogen from mercury(II) salts with carbonyl metallate anions (b) reaction of a halo-phenylmercury compound with a transition metal hydride and (c) oxidative addition of a mercury halide to neutral zero valent metals.1 We report here the syntheses of three compounds containing three-centre, two-electron, mercury-ruthenium bonds utilizing trinuclear cluster anions and mercury(II) halides.2-4... 

Picrates, especially salts of transition and heavy metals, such as nickel, lead, mercury, copper, and zinc picric acid is explosive but is less sensitive to shock or friction than its metal salts, and is relatively safe as a water wet paste Polynitroalkyl compounds, such as tetranitromethane and dinitroacetonitrile Polynitroaromatic compounds, especially polynitrohydrocarbons, phenols, and amines... 

It is alloyed with about 4% A1 and 0.02% Mg. The aluminum strengthens the zinc and also prevents the molten alloy from attacking the steel pressure casting dies. Zinc readily reacts with mercury or will displace mercury from a mercury(II) salt to form an amalgam that is usefril for reductions, as in the preparation of compounds of the lower oxidation states of transition metals and lanthanides (e.g. Cr , V , Eu°, dimeric Mo ) and in analytical chemistry (e.g. in the Jones reductor see Analytical Chemistry of the Transition Elements). 

Table 4. Formations of Organomercurials from Mercury(II) Salts with 0--B0NDED Transition-Metal Compounds... 

Transition-metal compounds Mercury salt and conditions Product (yield, %) Ref. 

Direct metallation. Direct C-H metallations are of several types, of which the most important is reaction ( deprotonation ) with a strongly basic reagent, usually a lithium compound, but is also possible for magnesium and zinc. Electrophilic metallation can be carried out with palladium(II) and mercury(II) salts, and neutral C-H insertion by other transition metals is becoming increasingly important, usually for catalytic reactions. 

The replacement of the diazonio group by metals and related transition elements was investigated intensively until the mid-20th century, particularly by Nesmeyanov and coworkers (reviews173). Most intensively studied were mercury-de-diazoniations. Since about 1970 there has been very little activity in the whole field of aryl-element chemistry as far as arenediazonium salts are involved. This decrease is probably due to the lack of interest for technological purposes, and to the environmental problem, which the synthesis and the use of the compounds cause. 

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