Day: November 21, 2022

Lipatova, T. E. published the artcileCatalytic activity of copper β-diketonates in the formation of urethanes, HPLC of Formula: 14284-06-1, the publication is Doklady Akademii Nauk SSSR (1975), 220(4), 873-6 [Phys chem], database is CAplus.

Of 11 Cu dicarbonyl chelates tested for catalytic activity in the reaction of PhNCO with MeOH the 3 most active were (RCOCH2COR1)2Cu with R, R1 = EtO, Me; Me3C, Me; and Me3C, Me3C. The effect of the ligand on the π character of the Cu-ligand bond was the main factor. A correlation between reaction rate and ligand basicity was also found.

Doklady Akademii Nauk SSSR published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, HPLC of Formula: 14284-06-1.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Lipatova, T. E. published the artcileEffect of copper β-diketone complexes on properties of polyurethane prepared using 4,4′-diphenylmethane diisocyanate and a poly(ethylene) glycol with molecular weight 2000, Product Details of 0, the publication is Kompozitsionnye Polimernye Materialy (1979-1996?) (1984), 19-22, database is CAplus.

Cu bis(Et acetoacetate) (I) [14284-06-1], used as a catalyst in the synthesis of p-MDI-polyethylene glycol polyurethane  [9048-57-1], remained in the polymer after polymerization and led to structural modification and improved thermal stability. I acted as a coordinative crosslinking agent in the polyurethane system. The polyurethane containing I underwent 5% weight loss at 275° compared with 210° in the absence of I.

Kompozitsionnye Polimernye Materialy (1979-1996?) published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Product Details of 0.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Kozak, N. V. published the artcileThe effect of 3d-metal chelates on the molecular structure microheterogeneity of an incompatible linear polymer-net polymer system, SDS of cas: 14284-06-1, the publication is Theoretical and Experimental Chemistry (2005), 41(4), 265-270, database is CAplus.

The influence of the nature of the central ion [Cu(2+), Cr(3+), Fe(3+)] of the chelate compound on the possibility of interaction of the metal-containing modifier with one or both of the components of the incompatible PU/PMMA system was studied by ESR. It was shown by low-angle x-ray diffraction that the change in the degree of microheterogeneity of the semi-IPN correlated with the characteristics of complex forming metal and the polymer matrix.

Theoretical and Experimental Chemistry published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, SDS of cas: 14284-06-1.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Tadokoro, Hiroyuki published the artcileCatalysis of polyvinylpyridine-supported copper(II) during 2,6-Di-tert-butylphenol oxidation in the presence of inorganic base, Related Products of copper-catalyst, the publication is Journal of Catalysis (1992), 138(1), 24-37, database is CAplus.

The liquid-phase oxidation of 2,6-di-tert-butylphenol (BOH) was studied by using the heterogeneous polymer-supported Cu(II) catalyst, basic Cu(II)-poly(4-vinylpyridine) [Cu(II)-PVP] catalyst. The only oxidation product was 3,3′,5,5′-tetra-tert-butyl-4,4′-diphenoquinone. The oxidation reaction of BOH did not proceed over the Cu(II)-PVP catalyst by itself; it needed promotion by addition of an inorganic base such as KOH in the solvent. The added KOH had the role of generating the corresponding phenolate anion by dissociating the BOH mol. The turnover number [mol of absorbed O₂ per unit time and unit mol of Cu(II)] with the basic Cu(II)-PVP catalyst in the BOH oxidation passed through a maximum with the variation in the pyridine/Cu(II) mol ratios (ligand ratio). The reaction order was dependent on the Cu(II) concentration and changed from 2nd- to 1st-order with an increase in the Cu(II) amount in the Cu(II)-PVP. The kinetics show that the rate-determining step in the BOH oxidation catalyzed by the basic Cu(II)-PVP changed from the reoxidation of the dinuclear Cu(I) complex by O₂ to the BOH oxidation by the mononuclear Cu(II) complex with an increase in the Cu(II) amount in the Cu(II)-PVP catalyst. The catalytic activity of the Cu(II)-PVP catalyst remained almost constant and it could be reused.

Journal of Catalysis published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is C20H28B2O4S2, Related Products of copper-catalyst.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Nakagawa, Katsutoshi published the artcileCatalysis by homogeneous copper(II) chelate-amine complexes in the oxidation of 2,6-dialkylphenols, HPLC of Formula: 14284-06-1, the publication is Studies in Organic Chemistry (Amsterdam) (1988), 315-20, database is CAplus.

In the title reactions the oxidation activity and the oxidative-coupling mode of products were mainly governed by the copper(II) chelate and amine/copper(II) mole ratio, and the basicity of the amines, resp. The rate-determining step was the reaction of O with the copper-phenol adduct.

Studies in Organic Chemistry (Amsterdam) published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, HPLC of Formula: 14284-06-1.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Kamalov, G. L. published the artcileLiquid-phase oxidation of dibenzyl ether with air in the presence of some transition metal complexes, COA of Formula: 0, the publication is Neftekhimiya (1982), 22(6), 788-92, database is CAplus.

The title reaction was examined in the presence of the following catalysts: [(RNH)₂CS]₂CoCl₂ [R = H, Ph; (RNH)₂ = HN(CH₂)₃NH, HN(CH₂)₄NH], CoCl₂, [(RCO₂)₆(R¹H)_nFe₃(O)].L [R = Me, ClCH₂, Cl₃C, Me₃C, (un)substituted Ph; R¹ = (un)substituted BzO, HO; n = 2, 3; L = OH, Cl, NO₃), and β-dicarbonyl complexes of Cu(II). Electron-donating substituents in the last 2 groups of complexes increased the rate, and electron-withdrawing groups decreased it.

Neftekhimiya published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, COA of Formula: 0.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Tsuruya, Shigeru published the artcileCatalysis of copper(II) chelate-amine complexes in the oxidative coupling of 2,6-dialkylphenols, Related Products of copper-catalyst, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (1987), 25(4), 995-1010, database is CAplus.

The oxidative coupling reaction of 2,6-dimethylphenol (I) and 2,6-di-tert-butylphenol (II) with mol. O was effected in the presence of copper(II) chelate complex catalysts. The oxidation products of I were poly(2,6-dimethyl-1,4-phenylene oxide) and 3,3′,5,5′-tetramethyl-4,4′-diphenoquinone, and that of II was 3,3′,5,5′-tetra-tert-butyl-4,4′-diphenoquinone. The basicity and the steric bulkiness of the amine used as a ligand for copper(II) β-diketonato catalysts were 2 of the main factors that governed the oxidative coupling of I. The rate of O consumption for copper(II) bisacetylacetonate-piperidine system was first order with respect to O partial pressure and zero order with respect to I concentration

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is C4H3Cl2N3, Related Products of copper-catalyst.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Naruta, Yoshinori published the artcileCopper-catalyzed double cyclization reaction of azidoquinones: one-step synthesis of dihydropyrroloindoloquinones and related quinolinoquinones, Recommanded Product: Copper(II) ethylacetoacetate, the publication is Journal of Organic Chemistry (1987), 52(18), 3956-67, database is CAplus.

Intramol. cyclization of azido(pentadienyl)quinone I (R = H) has been examined in the presence of metal salts, e.g., ML_n (M = Cu, Mn, Co, etc.; L = acetylacetonato). Copper or CuL₂ exhibited the highest catalytic activity both to the decomposition of the azide and to the formation of the corresponding dihydropyrroloindoloquinone II (R = H) which was obtained in 58% yield in one step. The related azido(hexadienyl)quinones gave the corresponding quinolinoquinone derivatives in moderate yields. Thus, pyrolysis of hexadienylquinone derivative I (R = Me) in benzene in the presence of CuL₂ afforded 27% quinolinoquinone. The double cyclization reaction proceeds with extremely high regio- and stereoselectivity, and the generality was established. Quinonoid structures and the presence of a conjugated dienyl side chain at the proximal position to an azide group are essential for the completion of this double cyclization reaction. The role of the copper catalyst to the cyclization reaction is also discussed.

Journal of Organic Chemistry published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Recommanded Product: Copper(II) ethylacetoacetate.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Maruyama, Kazuhiro published the artcileCopper(II)-catalyzed cyclization of azidoalkadienylquinones. Stereoselective formation of dihydropyrroloindoloquinones and the related quinolinoquinone, Synthetic Route of 14284-06-1, the publication is Chemistry Letters (1987), 97-100, database is CAplus.

Azidoalkadienylquinones (e.g., I; n = 1,2) cyclized in the presence of Cu(acac)₂ (acac = acetylacetonate) to stereoselectively give up to 48% dihydropyrroloindolediones and -quinolinediones (e.g., II; n = 1,2). In the absence of Cu(acac)₂ cyclization did not occur. Evaluation of other metal salts and ligands showed Cu(acac)₂ had the best catalytic activity.

Chemistry Letters published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Synthetic Route of 14284-06-1.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Alonso, Miguel E. published the artcileStudies on the origin of dihydrofurans from α-diazocarbonyl compounds. Concerted 1,3-dipolar cycloaddition vs. nonsynchronous coupling in the copper chelate catalyzed reactions of α-diazodicarbonyl compounds with electron-rich olefins, Synthetic Route of 14284-06-1, the publication is Journal of Organic Chemistry (1982), 47(19), 3747-54, database is CAplus.

The Cu chelate catalyzed thermolysis of alkyl 2-diazo-3-oxobutyrate and of 3-diazo-2,4-pentanedione in the presence of vinyl ethers, to give 4-(alkoxycarbonyl)- and 4-acyl-2,3-dihydrofurans, is used to probe the mechanism of this transformation in terms of the concerted 1,3-dipolar cycloaddition of the metal-oxocarbene complex vs. the initial formation of the cyclopropane followed by 1,3-sigmatropic rearrangement to the heterocycle. Evidence is presented in favor of a third possibility, namely, that of a nonsynchronous stereospecific addition of the metal-carbene to the olefinic substrate which accounts for the formation of cyclopropanes, dihydrofurans, and products of apparent allylic C-H insertion and cyclopropane structural isomerization from a common intermediate. This mechanism is supported by a study of the addition of Et 2-diazo-3-oxobutyrate to benzo[b]furan.

Journal of Organic Chemistry published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Synthetic Route of 14284-06-1.

Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”