Lead dichloride

Lead Chloride. Lead dichloride, PbCl2, forms white, orthorhombic needles some physical properties are given in Table 1. Lead chloride is slightly soluble in dilute hydrochloric acid and ammonia and insoluble in alcohol. It is prepared by the reaction of lead monoxide or basic lead carbonate with hydrochloric acid, or by treating a solution of lead acetate with hydrochloric acid and allowing the precipitate to settle. It easily forms basic chlorides, such as PbCl Pb(OH)2 [15887-88 ] which is known as Pattinson s lead white, an artist s pigment. 

Lead tetramethyl and lead tetraethyl are covalent lipophilic liquids of low water solubility. Certain inorganic forms of lead, for example, lead tetrachloride, have similar properties, but other forms such as lead nitrate and lead dichloride are ionic and water soluble. Covalent and lipophilic forms of lead, like lipophilic forms of organomercury and organotin, can readily cross membranous barriers such as the... 

Lead dichloride occurs in nature as the mineral cotunnite. The compound is used in making many basic chlorides, such as Pattison s lead white. Turner s Patent Yellow, and Verona Yellow, used as pigments. Also, it is used as a flux for galvanizing steel as a flame retardant in nylon wire coatings as a cathode for seawater batteries to remove H2S and ozone from effluent gases as a sterilization indicator as a polymerization catalyst for alpha-olefins and as a co-catalyst in manufacturing acrylonitrile. 

Lead dichloride is precipitated by adding hydrochloric acid or any chloride salt solution to a cold solution of lead nitrate or other lead(ll) salt ... 

In dilute solutions of hydrochloric acid or halide ion, solubility of lead dichloride decreases however, in concentrated solutions, solubility increases due to formation of the complex ion, tetrachloroplumbate(ll), [PbCL] ... 

The latter also forms complex salts of alkali metals M2PbCl4 and MPb2Cl5. Lead dichloride is hydrolyzed by steam to a basic chloride Pb(OH)Cl and hydrochloric acid ... 

Aqueous solution of lead dichloride also undergoes double decomposition reactions with several metal salts, precipitating insoluble lead salts. 

When an aqueous solution of lead dichloride is mixed with caustic soda or other alkahes, basic chlorides such as PbCL Pb(OH)2 are formed. They are used as pigments. 

However, in the above method some amount of lead dichloride may form, especially if the temperature is above 0°C. 

Lead tetrachloride decomposes at 20°C, forming lead dichloride and evolving chlorine ... 

Lead tetrachloride forms additive compounds with the bases pyridine and aniline, as, for example, dipyridino-lead tetrachloride, [Pb(CsHsN)2]Cl4, and trianilino-lead tetrachloride, [Pb (C e IS NH 2) 3] Cl 4. These compounds are prepared by adding the base to solutions of the chloride in chloroform. They decompose in moist air and on heating. Two pyridino-derivatives of lead dichloride are known a compound of composition 8PbCl2.4(C5H5N), which crystallises in colourless needles,5 and dipyridino-lead dichloride, which corresponds to the diammine. Dipyridino-lead dichloride, [Pb(CsH5N)2]Cl2, crystallises in colourless needles and readily loses pyridine on exposure to air.8... 

Pb (terravalent) 51-2%, yel crysts, mp - explodes at 229° Can be prepd by treating diethyl lead dichloride in w at RT with equivalent amt of di-ammonium styphnate. Was patented by Burrows et al (Ref 2) as a compo-. nent of ignition compns in electric detonators. Requires firing current of 0.36 amp in cemented charge... 

A similar hybrid type of radical/anionic reactions can be effected, when manganese metal, activated by catalytic amounts of lead dichloride and trimethylchlorosi-lane, is employed instead of zinc, which makes the original process synthetically more reliable and attractive by reducing the amounts of reagents (RX and ketone) needed to a 1.5 molar excess over the alkenes (Scheme 6.36) [57]. 

The electrodeposition of lead, Pb, has been investigated in an acidic EMICl-AICI3 ionic liquid [27]. A divalent lead species, Pb(II), can be introduced by dissolving lead dichloride, PbCl2, or the anodic dissolution of metallic Pb. Metallic Pb is obtained by the reduction of Pb(II) ... 

SYNS LEAD 2+) CHLORIDE LEAD(II) CHLORIDE LEAD DICHLORIDE PLUMBOUS CHLORIDE... 

Polyesters obtained by interfacial polycondensation of aliphatic and aromatic diacids with dialkyl lead dichloride or dialkyl stannum dichloride possess biocide properties [105]. Ferrocene moieties may be also incorporated. 

When acrylate was employed the [3+2] cycloaddition proceeded without addition of lead dichloride the diastereomeric ratios of the products of the reaction between acrylate and the carbonyl ylide depended, however, on the presence of lead dichloride [84b]. For example, a tetrahydrofuran derivative with the trans configuration between the 2 and 5 positions was the main product when lead dichloride was added whereas 2,5-cis-tetrahydrofuran was the main product when no lead dichloride was added (Scheme 13.67). 

Treatment of ketones wifh a mixture of CH2I2, TiCl4, and zinc in THF at 0°C for 90 min produced fhe mefhylenation product in 5-8% yield whereas when lead dichloride was added the reaction proceeded smoothly at 0 °C to give the product in 81% yield wifhin 30 min (Scheme 13.68) [85]. A catalytic amount of lead dichloride probably promotes furfher reduction of zinc carbenoid (ICH2ZnI) by zinc in THF to give a geminal dizinc compound (CH2(ZnI)2) which is a key intermediate for the methylenation of carbonyl compounds. 

LEAD DICHLORIDE (7758-95-4) CljPb Noncombustible solid. A reducing agent. Reacts, possibly violently, with strong oxidizers. Contact with acids or acid fumes produces highly toxic chloride fumes. Incompatible with calcium (mixture is explosive in presence of heat). Forms heat-or shock-sensitive explosive mixtures with ammonium nitrate. Attacks metals in the presence of moisture and may cause pitting and stress corrosion in austenitic stainless steels. 

CCRIS 7665 EINECS 231-845-5 HSDB 6309 Lead chloride Lead (II) chloride Lead chloride (PbCl2) Lead dichloride Lead 2+) chloride Lecio Plumbous chloride. Used in pigments, solders and flux. White crystalline powder d 5.85 mp = 501° bp = 950° soluble in H2O, NH4CI, NH4NO3 MLD (guinea pig orl) = 1.5-2.0 g/kg. Mechema Chemicals Ltd. 

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