Mercury dichloride

Complex [(CXI )Ir(/j,-pz)(/i,-SBu )(/j,-Ph2PCH2PPh2)Ir(CO)] reacts with iodine to form 202 (X = I) as the typical iridium(II)-iridium(II) symmetrical species [90ICA(178)179]. The terminal iodide ligands can be readily displaced in reactions with silversalts. Thus, 202 (X = I), upon reaction with silver nitrate, produces 202 (X = ONO2). Complex [(OC)Ir(/i,-pz )(/z-SBu )(/i-Ph2PCH2PPh2)Ir(CO)] reacts with mercury dichloride to form 203, traditionally interpreted as the product of oxidative addition to one iridium atom and simultaneous Lewis acid-base interaction with the other. The rhodium /i-pyrazolato derivative is prepared in a similar way. Unexpectedly, the iridium /z-pyrazolato analog in similar conditions produces mercury(I) chloride and forms the dinuclear complex 204. 

The addition of trichloro- ortetrachloroethylene to aluminium components in dry cleaning equipments is responsible for many accidents. The effect of the carbon tetrachloride/methanol mixture in the 1/9 proportion of aluminium, magnesium or zinc causes the dissolution of these metals, whose exothermicity makes the interaction dangerous. There is a period of induction with zinc, which is cancelled out when copper dichloride, mercury dichloride or chromium tribromide is present. 

A similar series of reactions was performed by Paulsen and Hdlck141 for the preparation of the T-antigenic, unprotected, amino acid-disaccha-rides 200 and 201, starting from the 4,6-0-benzylidene-N-(benzyloxy-carbonyl) benzyl esters 198 and 199, respectively, by condensation with 110 in the presence of mercury dicyanide-mercury dichloride and molecular sieves 4A, and deprotection of the product. Sinay and co-workers148 also reported the synthesis of hexa-O-acetyl derivatives of 200 and 201 by application of the sequence of azido-nitration-bromination. 

The formed mercury dichloride is separated as a crystalline complex with dioxane. Since the starting arylmercury chlorides are easily prepared from diazonium salts, this method allows the conversion of anilines into aryltellurium trichlorides. 

ACN extn, precolumn derivatization with mercury dichloride (for fluorometric determination of aminopenicillins), liq-liq partn... 

Fluorometric detection has been mainly employed for the determination of aminopenicillins such as amoxicillin and ampicillin in edible animal products because it confers the advantages of selectivity and sensitivity. Fluorometric detection of penicillins, however, necessitates their precolumn derivatization to produce the corresponding fluorescent derivatives. The most commonly used derivatizing reagents are formaldehyde (100, 117, 118), salicylaldehyde (83), and mercury dichloride (91). 4-Bromomethyl-7-methoxycoumarin has also been employed as a fluorescence label for the selective and sensitive detection of seven penicillins in milk (96). 

Thiopyran-4-thiones give adducts with mercury dichloride which, by reaction with aqueous sodium carbonate, give a mixture of a-(l,2-dithiol-3-ylidene)ketone and thiopyran-4-one (Eq. 2).9> 10... 

Tellurium tetrachloride and tetrabromide react with equimolar quantities of aryl mercury chlorides to produce aryl tellurium trihalides in high yields. This reaction is useful when the trichlorotelluro group is required at a specific position in the aromatic molecule or when tellurium tetrachloride does not condense in an acceptable manner with the aromatic hydrocarbon. The solvent of choice is dioxane, because mercury dichloride precipitates as the dioxane adduct, facilitating the isolation and purification of the aryl tellurium trichlorides. 

Chlorophenyl Tellurium Trichloride1 A 100 ml one-necked flask is fitted with a reflux condenser carrying a calcium chloride drying tube and charged with 2.7 g (10 mmol) of tellurium tetrachloride, 3.5 g (10 mmol) of 4-chlorophenyl mercury chloride, and 30 ml of dry dioxane. The mixture is heated under reflux for 4 h, cooled to 20 , the mercury dichloride/dioxane complex is filtered off, and the filtrate is distilled under vacuum. The residue is recryslallized from glacial acetic acid yield 3.3 g (96%) m.p. 225°... 

The electrodeposition of mercury, Hg, has been studied in both basic and acidic EMICI-AICI3 ionic liquids [73]. Mercury dichloride, HgCl2, is soluble in the acidic ionic liquid to form a divalent mercury species, Hg " ", which can be reduced irreversibly to a cluster cation, Hg ... 

Another branch of the work was concerned with a reverse reaction, the interaction of mercury dichloride with organometallic compounds of Groups III, IV, or V. At that time, (1934), the literature on the reaction was surprisingly scarce. 

In alkaline media all the above compounds, except for Ar4Pb or Ar2PbCl2, formed ArjHg almost instantaneously when treated with mercury dichloride (or mercuric oxide) (54). The compound ArB(OH)2 behaved similarly. RHgOri could be arylated in alkaline media in the same fashion thus a new synthesis of unsymmetric RHgAr compounds was ready for use (Freidlina, Kocheshkov, Nesmeyanov) (55). 

With the adducts from mercury dichloride and acetylene, we [Nes-meyanov, Freidlina, Borisov (60-62)] began the investigation by studying the compounds of Biginelli and Jenkins for which either n or o-structures, or tautomerism between these might be assumed. 

The cis isomers are more stable than the trans isomers, so they may be prepared from the trans compounds by treating with peroxides or on irradiation (63, 64). Moreover, cw-chlorovinylmercury chloride could be obtained from acetylene and mercury dichloride vapors [Freidlina, Nogina (65)] and symmetrized by ammonia to give (IX), which retained the initial configuration (66). Finally, cw-chlorovinylmercury chloride could be synthesized from mercury dichloride and acetylene. 

The reader may remember that the 77-complex structure for the adducts formed from acetylene and mercury dichloride, or of related complexes of non-transitional-metal halides, was disproved by our stereochemical investigations. The true 77-complexes, however, were also obtained by us from tolan and the derivatives of such transition metals as V, Nb, and Ta (451-455). 77-Cyclopentadienylniobium tetracarbonyl reacted with tolan according to the scheme shown on page 57. 

A. BIS[ TRIMETHYL(METHYLENE)PHOSPHORANE] MERCURY DICHLORIDE (Bis(trimethylphosphoniuni methylide)mercury Dichloride)... 

Fig. 2 Chromatogram of a standard mixture after complexa-tion with sodium diethyldithiocarbamate. Composition of the standard mercury dichloride, methylmercury chloride, ethyl-mercury chloride, methoxyethylmercury chloride, ethoxyethyl-mercury chloride, phenylmercury chloride, and tolymercury chloride. [Reprinted from A. Knochel and H. Potgeter, Interfacing supercritical fluid chromatography with atomic fluorescence spectrometry for the determination of organomercury compounds,/. Chromatogr. A 786 192 (1997). Copyright 1997, with permission from Elsevier Science.]...

Synonym(s) Colloidal mercury liquid silver mercury, metallic (DOT) quicksilver metallic mercuryb hydrargyrum0 Bichloride of mercury mercury bichloride01 mercury chlorided mercury dichloride mercury perchloride mercury (II) chloride perchloride of mercury corrosive sublimated corrosive mercury chloride dichloromercury Etiops mineral0 mercury sulfide, blackd vermilion Chinese red C.l. Pigment Red 106 C.1.77766° quicksilver vermilion Chinese vermilion red mercury sulfide artificial cinnabar red mercury sulfuretd... 

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