Decomposition Of Bis Research Articles

Decomposition of bis(silyldiazomethyl) polysilanes: formation of polysilabicyclo[1.m.n]alkane derivatives

The photolysis of bis(trimethylsilyldiazomethyl)disilane ( 4a) in tert-butyl alcohol provided the tert-butyl alcohol adducts 5, 6, 7, 8 and 9. The structures of these products revealed the stepwise formation of asymmetric silenes as intermediates. Gas-phase pyrolysis of 4a and subsequent reaction with methanol and 4-methyl-1,2,4-triazoline-3,5-dione yielded the compounds 13 and 14, which are derived from the 1,4-disilabutadiene intermediate ( 16) rather than 1,2-disilacyclobutene ( 15). The photolysis and thermolysis of bis(dimethylphenylsilyl-diazomethyl)trisilane ( 4b) afforded 21b, 22b, 23b and 24b. Formation of compound 21b is attributed to the head-to-tail [2 + 2]cycloaddition of 1,5-disila-1,4-pentadiene ( 26b), while that of 23b, 22b and 24b is attributed to head-to-head [2 + 2]cycloaddition of 26 followed by reactions with tert-butyl alcohol and oxygen. Photolysis and pyrolysis of bis(trimethylsilyldiazomethyl)trisilane ( 4c) and bis(dimethyl-phenylsilyldiazomethyl)tetrasilane ( 4d) gave 29, 30 and 21d, which is consistent with an alternative mechanism, i.e. [2 + 2]silene-diazo cycloaddition.

The thermal degradation characteristics of selected organoplatinum antitumor agents

The thermal decomposition characteristics of representatives of three classes of organoplatinum compounds have been examined by thermogravimetry. Substituted salicylato(1,2-diaminocyclohexane)platinum(II) compounds undergo thermal decomposition by sequential loss of first the salicylato ligand and then the amine ligand to afford a residue corresponding to the platinum content of the compound. The thermal decomposition of N-arylsalicylaldimino(1,2-diaminocyclohexane)platinum(II) nitrate is more complex, but is also characterized by two major weight losses. Thermal decomposition ofbis-(2-thiophenecarboxylato)platinum(II) is characterized by ligand fragmentation to generate a residual mass corresponding to the platinum content of the compound.

Photochemical and Thermal Decomposition of Bis(3-chloro-2-methylphenyl)diazomethane

The reactions of diarylcarbene (2c) generated from the photolytic and thermal decomposition of diaryldiazomethane (1c) were investigated. The effect of steric hindrance in (2c) was insufficient to stabilize the carbene under the photolytic conditions to allow direct dimerization to form the olefin. In the thermal decomposition of (1c), only the azine (3c) was obtained. Both these observations are different from those reported for dimesitylcarbene (2b), and indicate that (2b) undergoes reactions (dependent largely on severe steric hindrance) which are not generally applicable to di-o-tolylcarbene and its derivatives.

Mechanism of the elimination of hydrogen fluoride in the mass spectral decomposition of bis(1,1-dihydropolyfluoroalkyl) ?-polyfluoroalkylbenzyl phosphates

Mechanism of the elimination of hydrogen fluoride in the mass spectral decomposition of bis(1,1-dihydropolyfluoroalkyl) ?-polyfluoroalkylbenzyl phosphates

Electro-initiated polymerization of bis-(2,4,6-tribromophenoxo) ethylenediamine copper(II) complex in DMF and its kinetic study by cyclic voltammetry

The decomposition of bis-(2,4,6-tribromophenoxo) ethylenediamine copper(II) complex in dimethylformamide by electro-oxidation yields low molecular weight (4.5 × 10 3) linear poly(dibromophenylene oxide). Electro-initiated polymerization was accomplished upon oxidation by a constant potential electrolysis under air or under N 2 at room temperature. Polymerization conditions were based on the peak potentials measured by cyclic voltammetry. Constant peak potentials carried out at anodic and cathodic peak potentials yielded polymers in the anolyte only. The kinetics of the polymerization were followed by obtaining the unreacted monomer concentration by in situ cyclic voltammetry measurements during electrolysis. The characterization of the polymer was performed by 1H-NMR, 13C-NMR and FTIR spectroscopies. For determination of M n , the isopiestic method was used.

The adsorption and decomposition of BIS(benzene)chromium on Ni(100)

The adsorption and decomposition of BIS(benzene)chromium on Ni(100)

The adsorption and decomposition of BIS(Benzene)chromium on Ni(100)

We have studied the bis(benzene) chromium/Ni(100) chenusorption system using TPD, AES, XPS, UPS, and exchange of isotopically labeled molecules. Low coverages of the metal complex are completely decomposed in TPD to produce C (a), Cr (a), and H 2(g). At higher coverages, molecular benzene desorption is observed at ≅ 480 K, and, at still higher coverages, multilayer and monolayer molecular bis(benzene)chromium desorption occur at ≅ 250 and 300 K, respectively. Post-dosed C 6D 6 exchanges with C 6H 6 into the monolayer desorption, indicating along with XPS evidence that monolayer bis(benzene)chromium undergoes ligand separation below 300 K. Uncomplexed benzene desorbs at ≅ 160 K from multilayer bis(benzene) chromium; explanations for this are discussed. UPS of monolayer and multilayer benzene and bis(benzene)chromium are compared.

M�ssbauer and uv-visible spectroscopic study of the interaction of bis(toluene)iron(0) with surface hydroxyl groups of silica

Mossbauer and in-situ uv-visible spectroscopy to probe the interaction of toluene solutions of solvated iron atoms with silica gel having different concentrations of surface hydroxyl groups. Surface hydroxyl groups on sihca are found to facilitate the decomposition of bis(toluene)iron(0) well below its “normal” solution phase decomposition temperature of −30 °C. The silica supported iron clusters formed in this way are found to be finely divided crystallites of α-Fe2O3 with diameters less than 50 A.

ChemInform Abstract: Organometallic Synthesis of II‐VI Semiconductors. Part 1. Formation and Decomposition of Bis(organotelluro)mercury and Bis(organotelluro)cadmium Compounds.

AbstractThe product (IIIa), which is soluble only in coordinating media, is prepared as shown.

Organometallic synthesis of II-VI semiconductors. 1. Formation and decomposition of bis(organotelluro)mercury and bis(organotelluro)cadmium compounds

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic synthesis of II-VI semiconductors. 1. Formation and decomposition of bis(organotelluro)mercury and bis(organotelluro)cadmium compoundsM. L. Steigerwald and C. R. SprinkleCite this: J. Am. Chem. Soc. 1987, 109, 23, 7200–7201Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://doi.org/10.1021/ja00257a055RIGHTS & PERMISSIONSArticle Views280Altmetric-Citations110LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (300 KB) Get e-Alerts Get e-Alerts

Packing analysis in reactive crystals: the decomposition of bis(3,3,3-triphenylpropanoyl)peroxide in the solid state

Crystal potential energy calculations and packing analysis are presented for the title reaction, a solid-state process which has been carefully studied by McBride and coworkers by EPR and X-ray diffraction. The position of the carbon dioxide molecules resulting from the decomposition was approximately determined by an analysis of the free volume in the crystal and by packing energy calculations.

Catalysed decomposition of bis(ethoxythiocarbonyl) sulphide with tributylphosphine. A kinetic study in dimethyl sulphoxide, acetonitrile, and their mixtures with toluene

The reaction of bis(ethoxythiocarbonyl) sulphide (1) with tributylphosphine in acetonitrile, dimethyl sulphoxide, and in their mixtures with toluene was subjected to kinetic study. The effect of water content in acetonitrile was also investigated. Activation parameters were measured and related to charge development in the formation of the first transition state, in accord with the proposed mechanism.

Decomposition of bis(p-methoxybenzoyl) peroxide and the carboxy-inversion product on silica

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition of bis(p-methoxybenzoyl) peroxide and the carboxy-inversion product on silicaG. Craig Flowers and John E. LefflerCite this: J. Org. Chem. 1985, 50, 22, 4406–4408Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissue 1 November 1985https://doi.org/10.1021/jo00222a048RIGHTS & PERMISSIONSArticle Views500Altmetric-Citations11LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (405 KB) Get e-Alerts Get e-Alerts

Thermal decomposition of bis-(9-o- and 9-m-carboranyl)mercury

1. Thermal decomposition of bis-(9-o- and 9-m-carboranyl)mercury containing B-Hgσ bonds occurs with the formation of metallic mercury and a carboranyl radical. In the main the latter disproportionate giving carborane and oligocarborane and recombine to an insignificant extent into B,B'-biscarboranyl. 2. Thermal decomposition of 9-o and 9-m-carboranylmercury chlorides containing B-Hg σ-bonds occurs homolytically with the formation of metallic mercury and 9-chloro-o- and m-carboranes respectively. 3. A simple method has been proposed for making symmetrical the 9-o-, 9-m-, and 2-p-carboranylmercury chlorides (or trifluoroacetates) into the corresponding biscarboranylmercury derivatives under the action of an alkaline solution of sodium stannite.

Thermal decomposition of bis(phenylchromium tricarbonyl)mercury

1. The DTA method was used to study the thermal behavior of diphenylmercury and bis (phenylchromium tricarbonyl)mercury in the presence of finely dispersed Pd and Cr, and also without a catalyst. 2. The thermal decomposition of bis(phenylchromium tricarbonyl)mercury bears an autocatalytic character. 3. The behavior of the phenylchromium tricarbonyl radical, which is formed during the decomposition of the bis(phenylchromium tricarbonyl)mercury, was studied.

The crystal structure and properties of bis(2-methoxypyridine) cobalt(II)chloride

Bis(2-methoxypyridine)cobalt(II) chloride crystallises in space group P2 1 c at room temperature with cell dimensions a = 7.093(2) A ̊ , b = 14.978(3) A ̊ , c = 14.158(1) A ̊ , β = 90.57(2)° and z = 4 . Intensity data were collected by diffractometer to θ = 25° with Mo K α radiation; and with the 1763 significant reflexions, full matrix least squares refinement of all atoms led to R = 0.045. The cobalt atom is tetrahedrally coordinated. The magnetic moment, electronic and vibrational spectra of the compound have been examined and the results accord with the conclusions obtained from the single crystal investigation. The decomposition of bis(2-methoxypyridine)cobalt(II) chloride was studied by thermogravimetry and differential thermal analysis. Intermediate decomposition products were isolated. These compounds have been characterised by analyses, vibrational and electronic spectra. They have polymeric octahedral structures.

Radical stabilization: Synthesis and decomposition of a β-ketodiazene

The synthesis and decomposition of bis(1,1-dimethyl-2-oxo-2-phenylethyl)diazene ( 7e ) is described. The presence of a carbonyl group adjacent to a radical center greatly enhances the radical stability.

Polyfluorobicyclo[2.2.1]heptanes. Part 11. Bridgehead radicals: their generation, reactions, and CIDNP effects

Decomposition of bis-(4H-decafluorobicyclo[2.2.1]heptane-1-carbonyl) peroxide (I) alone affords 4H-decafluorobicyclo[2.2.1]heptan-1-yl 4H-decafluorobicyclo[2.2.1]heptane-1-carboxylate (III) and 4H,4H′-eicosafluoro-1,1′-bis(bicyclo[2.2.1]heptyl)(IV). In hexachloroacetone the peroxide (I) yields (IV) and 4H-1-chlorodecafluorobicyclo[2.2.1]heptane (V). Decomposition of (I) at 185° in hexachloroacetone in an n.m.r. probe showed large CIDNP effects. The decarbonylation of 4H-decafluorobicyclo[2.2.1]heptane-1-carbaldehyde (VI) by di-t-butyl peroxide yielded 1H,4H-decafluorobicyclo[2.2.1]heptane (VII). Electrolysis of 4H-decafluorobicyclo[2.2.1]heptane-1-carboxylic acid in the presence of methyl propenoate gave (E)-1-(4H-decafluorobicyclo[2.2.1]heptan-1-yl)-2-methoxycarbonylethylene (VIII), 1-(4H-decafluorobicyclo[2.2.1]heptan-1-yl)-2-methoxycarbonylethane (IX), and (±)- and meso-1,4-bis-(4H-decafluorobicyclo[2.2.1]heptan-1-yl)-2,3-bismethoxycarbonylbutanes (X) and (XI).

Data on the formation and decomposition of bis(pentafluorosulfur) trioxide, bis(pentafluorosulfur) dioxide, bis(pentafluorosulfur) monoxide and of the radicals SF 5O 2 and SF 5O. A review of earlier kinetic investigations

A method is described for the preparation of pure bis(pentafluorosulfur) trioxide. The mechanisms of formation and decomposition of SF 5O 3SF 5 and SF 5O 2SF 5 are described by reference to previous kinetic studies. The dissociation energies of these oxides and of the radicals SF 5O 2 and SF 5O are given and some reactions of SF 5·, SF 5O·, and SF 5O 2· are described.

Thermal studies of bis 2-amino-5-phenyl-1,3,4-thiadiazole copper(II) sulphate

Thermal decomposition of bis 2-amino-5-phenyl-1,3,4-thiadiazole copper(II) sulphate has been studied by TG, DTA and DTG. The electrical conductivity of the compound in the solid state have also been measured at different temperatures. It is believed that decomposition is a nucleation controlled process and starts at the site of defects.