Day: November 21, 2022

Zhang, Xuexia published the artcileCopper-Catalyzed Oxidative Coupling of AIBN and Ketone-Derived Enoxysilanes to γ-Ketonitriles, Category: copper-catalyst, the publication is Organic Letters (2018), 20(16), 4998-5001, database is CAplus and MEDLINE.

In the presence of Cu(MeCOCHCO₂Et)₂, acetophenone and benzalacetone trimethylsilyl enol ethers RC(OTMS):CH₂ [R = Ph, 4-MeC₆H₄, 3-MeC₆H₄, 2-MeC₆H₄, 4-MeOC₆H₄, 4-FC₆H₄, 4-ClC₆H₄, 3-ClC₆H₄, 2-ClC₆H₄, 4-BrC₆H₄, 4-IC₆H₄, 4-F₃CC₆H₄, 2-naphthyl, 2-furyl, 2-thienyl, 2-pyridinyl, 3-pyridinyl, (E)-PhCH:CH] underwent oxidative coupling with azobisalkanenitriles such as azobisisobutyronitrile (AIBN) mediated by Ag₂CO₃ in THF to yield γ-aryl-γ-ketonitriles such as RCOCH₂CMe₂CN [R = Ph, 4-MeC₆H₄, 3-MeC₆H₄, 2-MeC₆H₄, 4-MeOC₆H₄, 4-FC₆H₄, 4-ClC₆H₄, 3-ClC₆H₄, 2-ClC₆H₄, 4-BrC₆H₄, 4-IC₆H₄, 4-F₃CC₆H₄, 2-naphthyl, 2-furyl, 2-thienyl, 2-pyridinyl, 3-pyridinyl, (E)-PhCH:CH] in 22-91% yields. Attempted oxidative coupling in the presence of bis(oxazolinyl)pyridines yielded products with no enantioselectivity.

Organic 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 C19H14Cl2, Category: copper-catalyst.

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

Jain, A. K. published the artcileChelating ionophore based membrane sensors for copper(II) ions, SDS of cas: 14284-06-1, the publication is Talanta (2005), 66(5), 1355-1361, database is CAplus and MEDLINE.

Acetylacetone, ethylacetoacetate and salicylaldehyde, are reported to form chelates with Cu of high stability as compared to other metals. Therefore, PVC based membranes of bis[acetylacetonato] Cu(II) (A), bis[ethylacetoacetate] Cu(II) (B) and bis[salicylaldehyde] Cu(II) (C) were studied as Cu(II) selective sensors. The addition of Na tetraphenylborate and various plasticizers, viz., DOS, TEHP, DOP, DBP and TBP substantially improve the performance of the sensors. The membranes of various compositions of the three chelates were studied and the best performance was obtained for the membrane A (1%): PVC (33%): TBP (65%): NaTPB (1%). The sensor shows a linear potential response to Cu(II) over wide concentration range 2.0 × 10^-6 to 1.0 × 10^-1 M (detection limit ∼0.1 ppm) with Nernstian compliance (29.3 mV decade^-1 of activity) between pH 2.6 and 6.0 with a fast response time of ∼9 s. The potentiometric selectivity coefficient values as determined by match potential method (MPM) indicate excellent selectivity for Cu²⁺ ions over interfering cations. The sensor exhibits adequate shelf life (∼3 mo) with good reproducibility (S.D. ±0.2 mV). The sensor was used in the potentiometric titration of Cu²⁺ with EDTA. The utility of the sensor was tested by determining Cu in vegetable foliar and multivitamin capsule successfully.

Talanta 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”

Alonso, Miguel E. published the artcileEffect of catalyst on zwitterionic intermediacy in additions of dimethyl diazomalonate to vinyl ethers, Computed Properties of 14284-06-1, the publication is Tetrahedron (1989), 45(11), 3313-20, database is CAplus.

The reaction of di-Me diazomalonate with 2-alkoxy-6-methyl-3,4-dihydro-2H-pyran (I; R = H) in hot fluorobenzene was studied in the presence of some transition metal catalysts. The characteristic addition-elimination reaction that afforded the 3-malonyl-pyran derivative [I; R = CH(CO₂Me)₂] proceeded with the intervention of highly polar species, as indicated by the appearance of skeletal rearrangement products II that stem from the fragmentation of a carbenium ion at C-2 on the pyran ring. Mol. reorganization was strongly dependent on ligands and metal atom of the catalyst. This was the consequence of either a polar open-end transition state containing metal catalyst and dimethoxycarbonyl methylene sigma-bonded to C-3 of the pyran ring, or as a sigma olefin-metal carbene complex where stabilization of the pos. charge is provided by a strong polar interaction with high electron d. centers of appropriate ligands.

Tetrahedron 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, Computed Properties of 14284-06-1.

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

Ishchenko, S. S. published the artcileCatalysis by copper β-diketonates of the formation of polyurethanes based on polypropylene glycol, Category: copper-catalyst, the publication is Ukrainskii Khimicheskii Zhurnal (Russian Edition) (1985), 51(11), 1219-22, database is CAplus.

The kinetics of polymerization of MDI  [101-68-8] with polypropylene glycol (I) [25322-69-4] in the presence of CuL₂ (L = β-diketone) catalyst depended on the structure of the β-diketone ligand in the catalyst, the mol. weight of I, and the state of I in solution The polymerization rate constant decreased with increasing mol. weight of I due to a decrease in the concentration of active forms, i.e., intermol. associates of OH groups, and an increase in the nonactive forms, i.e., ether O atoms. The catalysts decreased in activity in the ligand order: dipivaloylmethane > Et acetoacetate > benzoylacetone > acetylacetone > trifluoroacetylacetone > hexafluoroacetylacetone.

Ukrainskii Khimicheskii Zhurnal (Russian Edition) 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, Category: copper-catalyst.

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

Kocovsky, Pavel published the artcileTransition-metal catalysis in Michael addition of β-dicarbonyls: tuning of the reaction conditions, Recommanded Product: Copper(II) ethylacetoacetate, the publication is Tetrahedron Letters (1986), 27(41), 5015-18, database is CAplus.

Michael addition of 2-cyclohexenone to RCOCH₂CO₂Et (R = Me, EtO) in the presence of BF₃.OEt₂ and transition metal acetylacetonates gives adducts I (same R). 2-Cyclopentenone and 2-methyl-2-cyclopentenone react analogously.

Tetrahedron 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, Recommanded Product: Copper(II) ethylacetoacetate.

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

Garra, Patxi published the artcileStable copper acetylacetonate-based oxidizing agents in redox (NIR photoactivated) polymerization: an opportunity for the one pot grafting from approach and an example on a 3D printed object, Computed Properties of 14284-06-1, the publication is Polymer Chemistry (2018), 9(16), 2173-2182, database is CAplus.

The use of new stable copper acetylacetonates in combination with specific bidentate ligands (e.g. 2dppba) is proposed for redox free radical polymerization (FRP) under mild reaction conditions (under air and at room temperature). These systems show high performances so that they can compete with the well-established reference redox initiating systems based on the amine/benzoylperoxide combination. Remarkably, some of our systems are also highly efficient when excited in the near IR region (NIR), demonstrating that our redox systems can also be activated by light. Using this strategy, the initial redox free radical polymerization could be converted into a redox photoactivated one. More interestingly, a stable copper methacryloyloxy-ethylacetoacetate (Cu(AAEMA)₂) bearing a reactive methacrylate function and a copper acetylacetonate moiety could be used to polymerize a first polymer layer onto which a second polymerization could be carried out. Precisely, the second polymerization was initiated by a redox process using mild reaction conditions (at room temperature and under air), different from the process used to form the underlayer. To the best of our knowledge, this re-initiation of polymerization from a pre-polymerized layer by a second polymerization technique is highly original and is of crucial industrial/academic interest as no high energy consumption/harmful wavelengths are required to reinitiate the polymerization The efficiency of this strategy is illustrated by grafting from a 3D printed object.

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 0, Computed Properties of 14284-06-1.

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

Clavier, Herve published the artcileNew bidentate alkoxy-NHC ligands for enantioselective copper-catalyzed conjugate addition, SDS of cas: 14284-06-1, the publication is Tetrahedron: Asymmetry (2005), 16(5), 921-924, database is CAplus.

Chiral alkoxy-imidazolinium salts are easily available via a five-step procedure starting from β-amino alcs. This new family of alkoxy-N-heterocyclic carbene (NHC) precursors is shown to be highly active in the enantioselective copper-catalyzed conjugate addition to cyclic enones. Complete conversion with low catalyst loading and good enantiomeric excesses up to 93% were obtained at room temperature A ligand thus prepared and optimized was a (2S)-2-amino-4-methyl-1-pentanol derivative (I).

Tetrahedron: Asymmetry 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”

Igumenov, I. K. published the artcileStudy of the volatility of some copper(II) β-diketonates, Synthetic Route of 14284-06-1, the publication is Koordinatsionnaya Khimiya (1978), 4(2), 163-9, database is CAplus.

The vapor pressure, P, of CuL₂ chelates, where L = R₁COCH₂COR₂; R₁ = Me, CF₃, C₃F₇, Ph; and R₂ = Me, CF₃, CMe₃, Ph, OEt, and C₄H₃S, was determined at 80-200° by a static method. From the exptl. P data, the heat, entropy, and free energy of vaporization of the chelates were calculated

Koordinatsionnaya Khimiya 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”

Tudose, Maria published the artcileAnalytical studies on some organometallic compounds of Cu²⁺ precursors for T_c superconductors, HPLC of Formula: 14284-06-1, the publication is Analele Stiintifice ale Universitatii “Al. I. Cuza” din Iasi, Chimie (2000), 8(1), 51-58, database is CAplus.

Data on synthesis, solubility in common organic solvents and behavior at thermal decomposition studied by DTA analyses of some organometallic compounds of Cu²⁺ which are precursors for superconductor ceramics of high T_c by either sol-gel technique or metal organic decomposition are presented. The organometallic compounds used in the present paper are an acetylacetonate complex, an Et acetoacetate complex and a mixed alkoxide: acetylacetonate-methoxyethoxide of Cu. These complexes were obtained by the reaction between a Cu salt (acetate, chloride) and a chelating agent (acetylacetone, Et acetoacetate) under the different conditions of temperature and pH medium. The alkoxide was synthesized by the alcoholysis of acetylacetonate complex with MeOH and then methoxyethanol under the basic conditions. The results on these analyses are useful for selection of solvents for their dissolving. The best solvent selected is then used in the techniques for deposition of thin layers by deep-coating or spraying, as well as in coloring of glasses.

Analele Stiintifice ale Universitatii “Al. I. Cuza” din Iasi, Chimie 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 C10H2F12NiO4, 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”

Matare, Gilbert J. published the artcileAcetylation of β-diketone copper(II) chelates by treatment with ketene, Recommanded Product: Copper(II) ethylacetoacetate, the publication is Synthesis (1994), 381-2, database is CAplus.

Geminal triketones R¹COCHAcCOR² (R¹ = R² = alkyl, Ph; R¹ = Me, R² = EtO) were prepared by acetylation of β-diketone [R¹COCH₂COR²] Cu(II) chelates with ketene, followed by decomplexation with 15% HCl solution

Synthesis 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”