Mercuric halide

Alkyl mercuric halides. Grignard reagents, prepared from alkyl halides, react with a mercuric halide that contains the same halogen as the reagent to form alkyl mercuric halides ... 

HaUde B.P. M.P.. 20 20 " D Anilide a-Nsphtha- lide Alkyl Mercuric Halide S-Alkyl- jo- thluronlum Plcrate Plcrate of S-naphthyl ether... 

Mercuric halides, silver nitrate, and copper nitrates form stable complexes with bis-2.2 -thiazolylazo compounds (1591). for which the X-ray structure is not yet known. 

The present procedure seems to be a general one for producing alkyl halides from acids. To aid in isolating higher-boiling or solid products, solvents such as carbon tetrachloride and cyclohexane can be used.7 In preparing a solid, the mercuric halide can be removed by extraction with 5% potassium iodide. 

The mechanism of the cleavage of the alkyl-tin bond by mercuric halides and carboxylates has been thoroughly investigated, and the evidence is in favor of an open Se2 transition state (104-110). 

The reactions of mercuric iodide, mercuric bromide, and mercuric chloride with the excited species produced in the hexafluoroethane plasma were examined first, as the expected products were known to be stable and had been well characterized 13). Thus, these reactions constituted a "calibration of the system. Bis(trifluoromethyl)mercury was obtained from the reaction of all of the mercuric halides, but the highest yield (95%, based on the amount of metal halide consumed) was obtained with mercuric iodide. The mole ratios of bis(trifluoro-methyDmercury to (trifluoromethyl)mercuric halides formed by the respective halides is presented in Table I, along with the weight in grams of the trifluoromethyl mercurials recovered from a typical, five-hour run. 

The preparative reactions were conducted in sealed tubes in which — 1-3 g of the reagents had been placed. After the vessels had been maintained at the indicated temperatures for the designated times, the contents were removed, to be separated by fractional condensation and GLC. In addition to the (trifluoromethyl)Group 4A halides reported next, each sample contained unreacted (CFalaHg, the expected (tri-fluoromethyDmercuric halide, and the mercuric halide, identified by fluorine-NMR spectroscopy and mass spectrometry. 

Symmetrical ketones can be prepared in good yields by the reaction of organo-mercuric halides with dicobalt octacarbonyl in THF, or with nickel carbonyl in DMF or certain other solvents. The R group may be aryl or alkyl. However, when R is alkyl, rearrangements may intervene in the C02(CO)g reaction, though the Ni(CO)4 reaction seems to be free from such rearrangements. Divinylic ketones... 

Usually, C-mercury substituted phosphorus ylides are monomers and in order to stabilize these complexes the presence of a second substituent on the carbon is necessary to balance the electron-donating effect of the metal. However a dimeric complex 85 has been obtained by the reaction of mercuric halides HgX2... 

Apart from the fluoride, mercuric halides react explosively with potassium like all analogues of the other metals already mentioned. With mercurous salts, the reaction seems less violent since with mercurous chloride, molten potassium causes the mixture to incandesce without ever combusting. It is likely that other metals react too an extreme violent reaction was mentioned between indium and mercuric bromide. 

The complex [Au2(PPh3)2] has been prepared by reduction of [AuI(PPh3)] with sodium napht-halide. Its core unit is isoelectronic with mercurous halides Hg2X2 but, curiously enough, it has a dinuclear trans bent structure with d(Au—An) = 2.76 A and a Au—Au—P angle of 129°.3325 There is no confirmation as yet of the original preliminary report. 

Detailed studies have also been reported of the ability of the [IrX2(CO)2] anions to add a variety of molecules such as halogens, alkyl and acyl halides, mercuric halides, and On the other hand, the attempted oxidative... 

Mercury(II) complexes of two t5T>es have been prepared (6) from pent-4-enyl diphenyl phosphine and mercuric halides. These complexes are of the formulae [LHgX2]2(X = Cl, Br, I) and LaHgXg (X = Br, I). In no case is the olefin coordinated to the metal. 

It has been found on examination of the ammino-derivatives of mercuric halides that the nature of the halogen present has a marked effect on the stability ol the compound. Thus, diammino-mercuric chloride, [Hg(NH3)2]Cl2, is stable and does not readily lose ammonia, whereas the corresponding iodide, diammino-mercuric iodide, [ITg (NH3) JI2, readily loses ammonia at ordinary temperature. The stability decreases in the order chloride, bromide, iodide. 

Silver and mercuric ions are relatively specific in their action on alkyl halides. The explanation of this fact is, of course, the great affinity of these metal ions for halide ion as evidenced by the small ionization of mercuric halides, the insolubility of silver halides, and the fact that the silver halides dissolve in excess halide ion to form complexes of the type AgX2 (21). 

Different metal chlorides unite with one another to form double lasts. Just as the acidic and basic oxides unite together to form oxy-salts, so do the halides of an electropositive element (or radicle) unite with a halide of a less positive element (heavy metal or metalloid) to form double halides. So far as is known the alkali chlorides do not unite with one another to form double salts, nor do the halides of the same natural group form compounds with one another, but compounds of the alkali chlorides with the chlorides of the more electronegative chlorides are known. A comparison of nearly 500 double halides has been made by H. L. Wells (1901).1 He calls the one component—e.g. the alkali halide—the positive halide, and the other the negative halide. A. Werner calls the halide which plays the role of the basic oxide, the basic halide, and the other, the acid halide. A great many of the simple types of the double salts predominate. Writing the number of molecules of the positive halide first, and the negative halide second, salts of the 2 1 and 1 1 ratios cover about 70 per cent, of the list of known double halides, and 4 1, 3 1, 3 2, 2 3, and 1 2 represent over 25 per cent. Two halides sometimes unite in several proportions—for instance, six caesium mercuric halides have been reported where... 

Halide B.P. M.P.. 20° dv 20° "D i Anilide i i a-Naphtha- llde Alkyl Mercuric Halide 1 S-Alkyl- o- thiuronium Pierate Pierate of B-naphthyl ether... 

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