Mercury salt, reagent

Mercurous Nitrate. Mercurous nitrate [10415-75-5] Hg2N20 or Hg2(N02)2, is a white monoclinic crystalline compound that is not very soluble in water but hydrolyzes to form a basic, yellow hydrate. This material is, however, soluble in cold, dilute nitric acid, and a solution is used as starting material for other water-insoluble mercurous salts. Mercurous nitrate is difficult to obtain in the pure state directly because some mercuric nitrate formation is almost unavoidable. When mercury is dissolved in hot dilute nitric acid, technical mercurous nitrate crystallizes on cooling. The use of excess mercury is helpful in reducing mercuric content, but an additional separation step is necessary. More concentrated nitric acid solutions should be avoided because these oxidize the mercurous to mercuric salt. Reagent-grade material is obtained by recrystaUization from dilute nitric acid in the presence of excess mercury. 

Perfluorovinylmercury compounds can be prepared via the reaction of perfluorovinyl Grignard reagents with mercury salts [16] (equation 127), either mono- or bismercurials can be obtained. The use of alkyl or aryl mercury salts gives the mixed bismercurials, (Z)-CgFj3CF=CFHgC2H3 (50%) [16] and (Z)-... 

Mercaptoethanol reagent 380 Mercury cations 144,311 Mercury lamps 20, 22 ff emission lines 23, 24 -, high pressure 22 ff -, technical data 23 Mercury(I) nitrate reagent 337 Mercury(II) salt reagent 340 Mesaconic acid 61 Mesoporphyrin 101, 102 Metal cations 310—312,398 Metal complexes 248, 398 Methanol, dipole moment 97 Methine dyestuffs 360 4-Methoxyaniline see Anisidine 4-Methoxybenzaldehyde see Anisaldehyde Methoxybenzaldehyde derivatives 72 Methoxycinnamic acid 277... 

Mercury(II) oxide is found natively in the mineral montroydite. The oxide is used primarily to prepare other mercury salts. The red form of the oxide is used as a depolarizer in a certain type of dry batteries. Other applications are paints and pigments as a reagent in several wet analyses and to catalyze in organic reactions. The oxide also is used in ointments as a topical antiseptic. 

Mercuric cyanide, when heated strongly in the absence of air, yields cyanogen (CN)2 and mercury. The salt is only slightly dissociated in water and yields no precipitate of mercury salt with any reagent except hydrogen sulfide. 

Thus the peculiar titration results were due to the heterogeneous catalysis, not of the original reaction, but of a new reaction that had arisen from the analytical procedure. Precipitates formed by the reagents themselves can also prove catalytically active. For instance, the catalysis by rare earth metal salts of the hydrolysis of acid phosphonate esters was actually due to the development of metal hydroxide gels [159], A quite different example concerns reactions of mercury salts where the disproportionation... 

Inhibition. Since papain, ficin, and bromelain are all enzymes whose activity depends on a free SH group, it is to be expected that all thiol reagents act as inhibitors. Thus, a-halogen acids or amides and N-ethyl-maleimide irreversibly inhibit the thiol proteases. Heavy metal ions and organic mercurial salts inhibit in a fashion that can be reversed by low molecular weight thiols, particularly in the presence of EDTA which... 

Copper Lewis acids have found many applications in the last decade in a variety of organic transformations and more notably in enantioselective reactions. In particular, Cu(OTf)2 and Cu(SbFg)2 in conjunction with chiral bisoxazolines are the chiral Lewis acids of choice for cycloadditions, aldol reactions, ene reactions, and other selective transformations. Moderately Lewis acidic copper salts are also reagents for transesterifications, dehydrations, and hydrolysis. The thiophilic nature of copper makes them ideal for selective deprotection of thio acetals and thioesters and offer practical advantages over mercury salts. 

By the use of what reagent or reagents can a soluble aluminium salt be distinguished from a soluble calcium salt State what happens with the reagent in each case (14) Likewise how can aluminium salts be distinguished from magnesium salts (15) From zinc salts (16) From mercury salts ... 

The reactivity of mercury salts is a function of both the solvent and the counterion. Mercuric chloride, for example, is unreactive and mercuric acetate is the most commonly used reagent, but the trifluoroacetate, trifluoromethanesulfonate, nitrate, or perchlorate salts are preferable in some applications. 

Decarboxylation of an aliphatic acid to the hydrocarbon is best effected by the so-called salt degradation method. That method is to treat the silver or mercury salt of, preferably, an aliphatic or alicyclic carboxylic acid with bromine in an inert solvent a halogenated hydrocarbon is then formed, together with carbon dioxide and the metal bromide, usually in an exothermic reaction, and the bromine can then usually be readily removed either cata-lytically or by means of a Grignard reagent (the Hunsdiecker reaction) ... 

Terminal olefins are oxidized by Jones reagent in the presence of catalytic amounts of mercuric acetate to methyl ketones in 80-90% yield. The mercury salt is essential (probable mechanism shown in I) salts of other metals are less efficient. Mercuric propionate can also be used. 

---