Alkylmercury chlorides

The reaction of aryltellurium trichlorides with aryl- or alkylmercury chlorides is a well-established and general method for the preparation of nnsymmetrical diaryl- or alkylaryl-tellnrinm dichlorides. ... 

Thin layer chromatography has been used to evaluate [125] organomercury compounds in industrial effluents. Ci-C6 -alkylmercury chlorides were separated on layers prepared with silica gel plus sodium chloride using as development solvent cyclohexane-acetone-... 

Alkylmercury chlorides are crystalline compounds, slightly soluble in water. Their melting point is relatively high, but they are highly volatile and toxic substances, and must be handled with extreme care. Their halogen content can be... 

Thin layer chromatography has been used to evaluate [125] organomercury compounds in industrial effluents. Ci-C n-alkylmercury chlorides were separated on layers prepared with silica gel plus sodium chloride using as development solvent cyclohexane-acetone-28% aqueous ammonia (60 40 1). The R, values decrease with increasing carbon chain length and the phenylmercury acetate migrated between the C, and Cj compounds. The spots are detected by spraying with dithizone solution in chloroform. 

Vapours of mercury, phenyl, and alkylmercury compounds were collected and measured as described except that the dichromate absorption solution was analyzed by the mercury reduction technique [28] after treatment with an excess of chloride hydroxylammonium chloride solution. 

Figure 2.8 Detection of alkylmercury compounds using flameless atomic absorption detector. Conditions column, Corasil I, 50 cm x 2.1 mm i.d. eluent, n-hexane flow rate, 0.5 ml min-1 detection, flameless atomic absorption spectrometer. Peaks 1, benzene, 2, ethylmercury chloride, and 3, methylmer-cury chloride.

Pd(II) salts promote the carbonylation of organomercury compounds. Reaction of phenylmercury chloride and PdCl2 under CO pressure affords benzophenone (429)[387]. Both esters and ketones are obtained by the carbonylation of furylmercury(II) chloride in alcohol[388]. Although the yields are not satisfactory, esters are obtained by the carbonylation of aryl- and alkylmercury(II) chlorides[389,390]. One-pot catalytic carbonylation of thiophene, furan, and pyrrole (430) takes place at the 2-position via mercuration and transmetallation by the use of PdCl2, Hg(N03), and CuCl2[391]. 

Samples of atmospheric mercury were obtained by pre-concentration of mercury on columns of graphitised carbon black (Carbotrap). The columns, at ambient temperature, retained mercury vapour and alkylmercury compounds (Bloom and Fitzgerald, 1988). Methylmercury chloride, ethylmercury chloride and dimethylmercury were held on the column at temperatures as high as 29°C and air flow rates as high as 790cm3min 1. At high flow rates and high temperature,... 

The kinetics of the reaction of hexamethylditin with Hg(II) chloride or alkylmercury salts are second order. Trialkylstannylmercurials RjSnHgCl or R3SnHgR are potential... 

Similar to the reactions of alkylmercurials and alkylsilanes, a-elimination of lithium chloride may occur to generate a carbene that adds to the alkene. The success of this unique transformation is probably due to the fact that the otherwise favored ) -elimination of lithium... 

The free radical chain reaction between PhCOCHjHgCl and 1-morpholinocyclohex-cne has been reported to involve addition of the acceptor radical PhCOCHj- to the jS-position of the enamine followed by electron transfer to regenerate the attacking radical (Scheme 19). Photostimulated reactions of simple alkylmercury halides failed since an electrophilic radical is required. Photolysis of p-nitrobenzyl chloride in the presence of enamines gave the -/>-nitrobenzyl ketone on hydrolysis . Radical mediated reductive alkylation of acyclic-enamines has also been reported with radical precursors such as PhSCH2CN, PhS02CH2Cl and Me3CS02CH2SePh . Reductive alkylation also occurred with chloromethyl p-tolyl sulphone in the presence of tributyltin hydride and azobis(isobutyronitrile) (AIBN) (Scheme 20). 

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