Month: November 2022

Padwa, Albert published the artcileRhodium(II)-catalyzed cyclization reactions of alkynyl-substituted ¦Á-diazo ketones, Safety of Allyldiphenylphosphine oxide, the publication is Journal of Organic Chemistry (1991), 56(7), 2523-30, database is CAplus.

Treatment of several o-alkynyl-substituted ¦Á-diazoacetophenone derivatives with rhodium(II) carboxylates results in the formation of substituted indenones. The simplest mechanism accounting for the results involves addition of a rhodium-stabilized carbenoid onto the acetylenic ¦Ð-bond to generate a vinyl carbenoid directly or possibly a highly strained cyclopropene derivative The vinyl carbenoid was found to undergo addition to a neighboring alkene tethered on the side chain to give an indenyl-substituted bicyclo[3.1.0]hexane derivative A number of related systems were examined so as to probe the scope and generality of the process. Treatment of 2-[CH₂:CHCH:CH(CH₂)₃Cú·C]C₆H₄COCHN₂ with rhodium(II) mandelate afforded a benzocyclopent[g]azulenone derivative I. The formation of this compound involves a divinylcyclopropane intermediate that readily undergoes a Cope rearrangement under the reaction conditions. The rhodium-catalyzed reaction of 2-[MeCO(CH₂)₃Cú·C]C₆H₄COCHN₂ in the presence of N-phenylmaleimide afforded a mixture of two cycloadducts II and III. Product II can be accounted for in terms of a cyclization of the vinyl carbenoid onto the oxygen atom of the neighboring carbonyl group to give a resonance-stabilized dipole. 1,3-Dipolar cycloaddition of the carbonyl ylide across the activated ¦Ð-bond of N-phenylmaleimide affords the observed product. The structure of II was confirmed by x-ray anal. The second cycloadduct III is formed by a 1,2-hydrogen shift of the initially produced vinyl carbenoid. The resulting diene undergoes a subsequent Diels-Alder reaction with N-phenylmaleimide.

Journal of Organic Chemistry published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Safety of Allyldiphenylphosphine oxide.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Tronov, B. V. published the artcileSynthesis of certain nitro and amino derivatives of diphenylamine and their complexes with acid reagents, Quality Control of 1821-27-8, the publication is Dokl. 2-oi [Vtoroi] Mezhvuz. Konf. po Khim. Org. Kompleksn. Soedin. (1963), 67-8, database is CAplus.

Formation of complexes of nitro and amino derivatives of Ph₂NH (I) was investigated. 4-Nitro- (Ia), 4,4′-dinitro- (Ib), 2,4-dinitro (Ic), 2,4-diamino (Id), and 4,4′-diaminodiphenylamine (Ie) were prepared Id and Ie were obtained by reduction of the corresponding nitro derivatives with SnCl₂ and HCl. The following complex compounds were prepared and extracted from alc. or C₆H₆ (composition of the complex, ratio of components, and m.p. given): Id + 2,4-dinitrophenol (II), 1:1, 83-4¡ã; Id + 2,6-dibromo-4-nitrophenol (III), 1:1, 156-8¡ã; Id + 2,6-dichloro-4-nitrophenol (IV), 1:1, 150-2¡ã; Id + picric acid (V), 1:1, 177-8¡ã; Ic + II, 1:1, 95-6¡ã; Ic + V, 1:1, 100-2¡ã; Ia + IV, 1:1, 94-6¡ã; Ia + III, 1:1, 98-9¡ã; Ie + V, 1:1, > 220¡ã; Ie + II, –, >220¡ã; Ie + IV, –, >220¡ã; Ie + III, –, >220¡ã.

Dokl. 2-oi [Vtoroi] Mezhvuz. Konf. po Khim. Org. Kompleksn. Soedin. published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H19BrS, Quality Control of 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ehm, Christian published the artcileHow a Thermally Unstable Metal Hydrido Complex Can Yield High Catalytic Activity Even at Elevated Temperatures, Computed Properties of 312-40-3, the publication is Chemistry – A European Journal (2016), 22(27), 9305-9310, database is CAplus and MEDLINE.

Despite their instability in ethereal solvents, organotitanium hydride catalysts are successfully employed in catalysis at moderate to high temperatures (110 ¡ãC), even in the presence of alcs. It is shown computationally (bond dissociation energy (BDE) anal. and energetic profile for regeneration) and exptl. (EPR studies and kinetic studies), with the specific example of hydrodefluorination (HDF), that despite the long standing belief, regeneration of Ti-H bonds from Ti-F bonds using silanes is endergonic. The resulting low concentration of Ti-H species is crucial for the catalytic stability of those systems. The resting state in the catalysis is a Ti-F species. The most promising silanes for regeneration are not the ones that have the strongest Si-F bond, but the ones that show the largest difference in Si-F and Si-H BDEs.

Chemistry – A European Journal published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Computed Properties of 312-40-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Limanov, V. E. published the artcileSynthesis and bactericidal activity of salts of higher aliphatic amines, Recommanded Product: Dodecylamineacetate, the publication is Khimiko-Farmatsevticheskii Zhurnal (1983), 17(6), 675-9, database is CAplus.

Title salts were prepared by mixing the components in a nonpolar solvent. Their bactericidal activity decreased in the order secondary amine > primary amine > quaternary ammonium > tertiary amine salt.

Khimiko-Farmatsevticheskii Zhurnal published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Recommanded Product: Dodecylamineacetate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Brzyska, W. published the artcileProperties and thermal decomposition in air atmosphere of cobalt(II), nickel(II), copper(II) and zinc(II) benzene-1,2-dioxyacetates, SDS of cas: 5411-14-3, the publication is Thermochimica Acta (1993), 223(1-2), 241-9, database is CAplus.

The conditions of formation of Co(II), Ni(II), Cu(II) and Zn(II) benzene-1,2-dioxyacetates were studied and their quant. compositions and solubilities in H₂O at 295 K were determined The IR spectra and x-ray diffractograms for the prepared complexes were recorded and their thermal decompositions in air were studied. During heating, the hydrated complexes MC₁₀H₈O₆.nH₂O lose some crystallization H₂O mols. in 1 or 2 steps, then decompose to the oxides, either directly (Zn) or with intermediate formation of the free metals (Co, Ni and probably Cu).

Thermochimica Acta published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, SDS of cas: 5411-14-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Brzyska, W. published the artcilePreparation and properties of rare earth element complexes with benzene-1,2-dioxyacetic acid, Quality Control of 5411-14-3, the publication is Polish Journal of Chemistry (1992), 66(4), 587-94, database is CAplus.

M₂L₃.nH₂O (M = Y, La-Nd, Sm-Lu; H₂L = C₆H₄(OCH₂CO₂H)₂–o; n = 7-16) were prepared Their quant. composition, solubility in H₂O at 293 K and molar conductivity of their 5 ¡Á 10^-1 M solutions were determined (solubilities are of the order of 10^-4-10^-3 mol¡¤dm^-3, and conductivities of the order of 10⁷ ¦ÌS). The x-ray diffraction patterns and IR spectra indicated that these complexes are crystalline and that the metal-ligand bond is ionic.

Polish Journal of Chemistry published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, Quality Control of 5411-14-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Brzyska, W. published the artcileThermal decomposition of Y, La and lanthanide benzene-1,2-dioxyacetates in an air atmosphere, Related Products of catalysis-chemistry, the publication is Journal of Thermal Analysis (1996), 46(6), 1687-1695, database is CAplus.

The thermal decomposition of Y, La and lanthanide (from Ce(III) to Lu(III)) benzene-1,2-dioxyacetates Ln₂(C₁₀H₈O₆)₃¡¤nH₂O were studied. The hydrated complexes 1st lose water of crystallization in one or two steps to yield anhydrous compounds or hydrates containing coordination water mols., and then decomposed to the oxides Ln₂O₃, CeO₂, Pr₆O₁₁ and Tb₄O₇ with formation of intermediates, carbonates and oxycarbonates (La, Pr-Eu), oxycarbonates (Y, Tb-Lu) or carbonate (Gd) only. Anhydrous cerium(III) benzene-1,2-dioxyacetate decomposes on heating directly to CeO₂.

Journal of Thermal Analysis published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Pasha, Mohammed Anif published the artcileOrganocatalytic Reductive Propargylation: Scope and Applications, Category: catalysis-chemistry, the publication is Journal of Organic Chemistry (2019), 84(23), 15399-15416, database is CAplus and MEDLINE.

An amino acid-catalyzed three-component reductive coupling protocol has developed for the selective high-yielding synthesis of nearly fifty examples of propargylated cyclic/acyclic systems from the various propargyl aldehydes, cyclic/acyclic CH-acids, and Hantzsch ester at the ambient conditions. It is an economical, efficient, catalytic, metal-free protocol for the quick gram scale synthesis of propargylated cyclic/acyclic compounds and many of these coupling compounds were purified by simple precipitation-filtration technique instead of column chromatog. Functionally rich propargylated cyclic-1,3-diketones were specifically transformed into dihydropyrans found in natural products and drugs through an annulative etherification reaction by using Lewis-acid (AgOTf) catalysis. Further C-methylation reactions on propargylated cyclic-1,3-diketones, which are prolific synthons in natural products and medicinal chem are developed.

Journal of Organic Chemistry published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C10H10O3, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Haerling, Stephan M. published the artcileInfluence of 18-Crown-6 Ether Coordination on the Catalytic Activity of Potassium and Calcium Diarylphosphinites in Hydrophosphorylation Reactions, Category: catalysis-chemistry, the publication is Inorganic Chemistry (2017), 56(15), 9255-9263, database is CAplus and MEDLINE.

The addition of 18-crown-6 ether (1,4,7,10,13,16-hexaoxacyclooctadecane) to tetranuclear [(thf)K(OPAryl₂)]₄ and [(thf)₄Ca(OPAryl₂)₂] yields the corresponding mononuclear complexes [(18C6)K(OPAryl₂)] [Aryl = Ph (1a), Mes (1b)] and [(18C6)Ca(OPAryl₂)₂] [Aryl = Ph (2a), Mes (2b)]. The metathesis reaction of [(thf)K(OPAryl₂)]₄ with CaI₂ yields the calciate [K₂Ca(thf)_x{OPMes₂}₄]. The addition of dimesitylphosphine oxide and crystallization from a hexane solution gives [K₂Ca{OPMes₂}₄{Mes₂P(O)H}] (3). The complexes [(thf)K(OPMes₂)]₄, [(thf)₄Ca(OPMes₂)₂], 1b, 2b, and the calciate 3 are tested as catalysts in the hydrophosphorylation of isopropylisocyanate with dimesitylphosphine oxide, quant. yielding N-isopropyl(dimesitylphosphoryl)formamide. The potassium complexes are more efficient catalysts than the calcium congeners, and coordination of 18-crown-6 decelerates the catalytic conversion.

Inorganic Chemistry published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Enthaler, Stephan published the artcileLow-Temperature Depolymerization of Polysiloxanes with Iron Catalysis, Recommanded Product: Difluorodiphenylsilane, the publication is ChemSusChem (2014), 7(7), 2030-2036, database is CAplus and MEDLINE.

The easy accessibility and high adjustability of polymers mainly accounts for the great impact of such materials on modern society. Besides this great success, an important matter is the accumulation of large amounts of end-of-life polymers, which are mainly deposited in landfills or converted by thermal recycling or down-cycling to low-quality materials. In contrast to that, the depolymerization of end-of-life polymers to monomers, which can be applied as feedstock in polymerization chem. for high-quality polymers, is only carried out for a small fraction of waste. Polysiloxanes are extensively used in a diverse array of technol. applications. Based on intrinsic properties of polymers, depolymerization is challenging and only a few high-temperature or less environment-friendly processes have been reported. In this regard, we have set up a capable low-temperature protocol for the depolymerization of poly(dimethylsiloxane) in the presence of catalytic amounts of simple iron salts in combination with different depolymerization reagents. The application of benzoyl fluoride, benzoyl chloride/potassium fluoride, or benzoic anhydride/potassium fluoride as depolymerization reagents affords difluorodimethylsilane or 1,3-difluoro-1,1,3,3-tetramethyldisilxanes as products, which are interesting building blocks for the synthesis of new polymers and allow an overall recycling of polysiloxanes.

ChemSusChem published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Recommanded Product: Difluorodiphenylsilane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia