Zinc perchlorate

Group 12 (IIB) Perchlorates. The zinc perchlorate [13637-61 -17, cadmium perchlorate [13760-37-7] mercury(I) perchlorate [13932-02-0] and mercury(II) perchlorate [7616-83-3] all exist. Cell potential measurements show that zinc and cadmium perchlorates are completely dissociated in concentrations up to 0.1 molar in aqueous solutions (47—49). Mercurous perchlorate forms a tetrahydrate that can be readily converted to the dihydrate on heating to above 36°C (50). 

The X-ray structure of a mono-pyridyl containing pentaaza crown macrocycle (3,6,9,12-tetra-methyl-3,6,9,12,18-penta-azabicyclo[12.3.1]octadeca-l(18),14,16-triene) with zinc perchlorate has been determined.71 ... 

Zinc oxide-eugenol surgical pastes, 8 286 Zinc oxide treatments, 26 613-614 Zinc-oxygen cells, 3 512-515 Zinc perchlorate, 18 278 Zinc peroxide, 18 397 Zinc phenolsulfonate... 

Alkali, alkaline-earth, and rare-earth metal cations also catalyze electron transfer reactions. Thus, in the pair of Co -tetraphenylporphyrin complex with BQ, no redox reaction takes place, or it takes place too slowly to be determined. The metal cations promote this reaction. For example, in the presence of 80(0104)3, the corresponding rate constant of 2.7 X 10 M s was observed. BQ transforms into benzosemiquinone under these conditions (Fukuzumi and Ohkubo 2000). Zinc perchlorate accelerates the reaction between aromatic amines and quinones (Strizhakova et al. 1985). This reaction results in the formation of charge-transfer complexes [ArNHj Q ]. The complexes dissociate in polar solvents, giving ion-radicals ... 

Cyclohexanones are readily reduced to the hydrocarbon in a sulphuric acid electrolyte. Reduction of ketosteroids in dioxan - aqueous sulphuric acid at a lead cathode in a divided cell is a convenient process for converting the carbonyl group to methylene [84,85] and affords as good yields as the alternative non-electrocheniical processes. Menthone is reduced to the hydrocarbon under mild conditions at a mercury cathode when the electrolyte is either magnesium chloride or zinc perchlorate in ethanol [86]. 

Zinc perchlorate (6H2O) [13637-61-1 ] M 372.4, m 105-107". Crystd from water. 

Finally, lV-(cyanomethyl)iminodiacetic acid was obtained from the ester of iminodiacetic acid and chloroacetonitrile as illustrated in Scheme l.10 The purified ester is hydrolyzed selectively at the methylester groups with zinc perchlorate in a 70% alcoholic solution and formation of the 1 1 complex (3) occurs. The substituted iminodiacetic acid is extracted with ether after zinc separation as ZnS by treatment with H2S, and crystallized in a chloroform ethanol solution. 

Zinc perchlorate accelerates the reaction between aromatic amine and quinones (Strizhakova et al. 1985). The reaction results in the formation of charge-transfer com-... 

Al Fakir, M. S., Progr. Astronaut. Aeronaut., 1981, 76, 5512—564 Admixture of lithium perchlorate [1] or zinc perchlorate [2] leads to decomposition with explosion at 290° or ignition at 240°C, respectively. The role of ammine derivatives of lithium and magnesium perchlorates in catalysing the thermal decomposition of ammonium perchlorate has been studied [3], and lithium perchlorate has a strong catalytic effect on the burning rate [4]. 

Zinc perchlorate and magnesium perchlorate can be used as electrolytes in aqueous -> zinc and primary - magnesium batteries. For example, zinc perchlorate is used as an electrolyte in dry cells comprising zinc anodes and manganese dioxide cathodes. 

Metal ions can enhance the resolution of nucleic acids and amino acids in MECC. Zinc perchlorate (0-30 mM) has been found useful as a complexing reagent for histidine-containing peptides. 

Several new routes involve formation of one carbon-carbon bond in pre-formed substrates. Palladium-catalyzed cyclization of /3-hydroxyenamine derivatives has been employed in a route to substituted pyrroles and 4,5,6,7-tetrahy-droindoles with multiple substituents by formation of the C-3-C-4 bond as the key feature, as illustrated by construction of the molecule 534 (Equation 146) <2006T8533>. Zinc perchlorate-catalyzed addition of alcohols to the nitrile functionality of a-cyanomethyl-/3-ketoesters, followed by annulation gave access to a series of substituted ethyl 5-alkoxypyrrole-3-carboxylates <2007T461>. Similar chemistry has also been used for synthesis of a related set of pyrrole-3-phosphonates <2007T4156>. A study on preparation of 3,5,7-functionalized indoles by Heck cyclization of suitable A-allyl substituted 2-haloanilines has also appeared <2006S3467>. In addition, indole-3-acetic acid derivatives have been prepared by base induced annulation of 2-aminocinnamic acid esters (available for instance from 2-iodoani-lines) <2006OL4473>. 

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