Mercury halides

The reaction of trifluoromethyl radicals, generated in a radio-frequency discharge process, with elemental mercury f/7i], mercury halides [174], dime-thylmercuiy [24], or HgO [175] has been used for the preparation of CFjHgX and (CF3)2Hg. Direct fluorination of dimethylmercury with elemental fluorine gives (CF3)2Hg [176],... 

Alkyl mercury halides participate in a photo-sdmidated rathcM chain reacdon of the anion of nitroalkanes Isee Eq. 5.38 in which a 375-W sun lamp Is used." Primary, secondary, and ternary alkyl rathcMs generated from alkyl mercury halides react with the anion of ttitroalkanes to form new C-C bonds. 

Mercury cyanide, 5, 1062 Mercury electrodes potential range aqueous solution, 1, 480 Mercury fluoride, 5. 1059 Mercury fulminate, 2, 7, 12 5, 1063 Mercury halides, 5, 1049 Mercury iodate, 5,1068 Mercury iodide, 5. 1059 Mercury ions Hgf... 

Free radical cyclization of alkenes with tin or mercury halides... 

A huge number of studies have been done in the past on cadmium and mercury halides and their complexes, and there is still research interest in the field, sometimes yielding surprising results. And simple-looking systems, on closer inspection, turn out to be rather complex. 

In benzene, the distribution constant depends on specific interactions between the solute and the benzene pi-electrons. Table 4.4 shows the importance of the volume effect for the mercury halide benzene system (Cl[Pg.132]

Table 4.4 Distribution Constants for Mercury Halides Between Benzene and 0.5 M NaClO,...

The alkyl mercury halides are irritating to the eyes, mucous membranes, and skin and may cause severe dermatitis and burns skin sensitization has occasionally occurred. ... 

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... 

Ligand exchange reactions have been used to prepare mercury(II) trialkylarsine complexes.202 Reaction of AgN03-AsMe3 with mercury halides gave the mercury arsine and silver halide (equations 10 and 11). The silver nitrate complex was not characterized. 

Both 1 1 and 2 1 complexes of Af,.ZV-diethyl- and N,iV-dimethyl-thiourea with zinc, cadmium and mercury halides have been prepared. The 2 1 complexes are either monomeric and tetrahedral or polymeric and halogen-bridged with octahedral metal coordination the 1 1 complexes also possess a polymeric, halogen-bridged structure, but with tetrahedral metal coordination.894 5... 

The reaction of dithiooxamide and its tetramethyl and tetraethyl derivatives with zinc, cadmium and mercury halides leads to complexes of stoichiometry MLX2 (M = Zn, Cd or Hg X = C1, Br or I).900,9 1 M—S bonding is involved IR spectra show that the zinc and mercury complexes are four-coordinate, while the cadmium complexes are octahedral with halogen bridges. 

Reactions of photoelectrons with cation defects as described here have also been found for mercury halides or for oxalates of Fe and Pd. Lead halides, in contrast, possess mobile anions which can trap photoelectron holes. In this case, the absorption of photons leads immediately to a positive image, where the illuminated areas appear light. 

A second, more indirect result of these studies is that for the first time large amounts, —10 g, of each of the bis(trifluoromethyl)Group IIB compounds became readily available. Bis(trifluoromethyl)mer-cury, for example, in addition to the syntheses indicated previously (1, 40), can also be conveniently prepared by any of a number of alternative methods, ranging from the direct fluorination of (CH3)2Hg to the reaction of mercury halides with CF3 radicals (99). The other disubsti-tuted compounds of Group IIB, (CF3)2Cd L2 and (CF3)2Zn L2, can be easily prepared from (CF3)2Hg as described below (100, 101). 

Complexes of several S-donor ligands have also been reported. The reaction of dithio-oxamide and its tetramethyl and tetraethyl derivatives with zinc, cadmium, and mercury halides leads to complexes of stoicheiometry MLX2 (M = Zn, Cd, or Hg X = Cl, Br, or I).64,65 M—S bonding is involved i.r. spectra show that the zinc and mercury complexes are four-co-ordinate, while the cadmium complexes are octahedral with halogen bridges. The complexes [ML3][C104]2 have also been prepared and do not contain co-ordinated perchlorate. The complexes ZnL (H2L = dithio-oxamide, NiV-dimethyl- and IVA -dicyclohexyl-dithio-oxamide) have been isolated,66 and consist of linear chains containing four-co-ordinate zinc. 

Aryl mercury halides can also be used for the arylation of aryl tellurium halides, as exemplified by the synthesis of 2-naphthyl phenyl tellurium using phenyl mercury(II) chloride in dioxane1. 

Mercury(II) halide complexes of the phenotellurazine precipitated when solutions of the mercury halide in ethanol were mixed with solutions of the heterocycle in diethyl ether. 

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