Category: copper-catalyst

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”

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”

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”

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”

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”

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”

Koval, L. I. published the artcileElectron and X-ray photoelectron spectra and structure of dicarbonyl complex of copper (II) with massive linear and branched alkyl substituents, Name: Copper(II) ethylacetoacetate, the publication is Ukrainskii Khimicheskii Zhurnal (Russian Edition) (2007), 73(1-2), 3-9, database is CAplus.

β-Dicarbonyl complexes of Cu (II), which had hot been studied before, were studied, in comparison with some known complexes, in solutions and in solid state by a set of spectral methods (XPS, visible electron absorption spectroscopy, diffuse reflection spectroscopy, and vibration spectroscopy). Electronic absorption spectra were analyzed in organic solvents which different in polarity and coordination ability. The statistical electron-spectroscopic data anal. was performed by Peak Fit Module (PFM) program. Basing on an anal. of the spectroscopic data obtained, the coordination unit [CuO₄] in the compounds studied has a square-planar-structure.

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, Name: Copper(II) ethylacetoacetate.

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

Nizel’skii, Yu. N. published the artcileEffect of oligomeric glycol on the catalytic activity of copper β-diketone complexes during urethane formation, Synthetic Route of 14284-06-1, the publication is Ukrainskii Khimicheskii Zhurnal (Russian Edition) (1983), 49(5), 542-6, database is CAplus.

Kinetic data for urethane formation in isocyanate and diisocyanate systems with alkanol, glycol, and oligomeric glycol in the presence of CuL₂ complexes (L = β-diketone) showed that catalyst reactivity depended on ligand structure and decreased in the order (of L): Me₃CCOCH₂COCMe₃ > CH₃COCH₂CO₂Et > PhCOCH₂COCH₃ > CH₃COCH₂COCH₃ > CF₃COCH₂COCH₃ > CF₃COCH₃COCF₃. The effect of ligand structures on catalyst activity was weakened in systems containing an oligomeric glycol. This weakening of the ligand structure effect is discussed in terms of H bonding and the formation of intra- and intermol. complexes by oligomeric glycols.

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, 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”

Nizel’skii, Yu. N. published the artcileStudy of polyurethane formation catalyzed by copper β-diketonates, Synthetic Route of 14284-06-1, the publication is Vysokomolekulyarnye Soedineniya, Seriya A (1979), 21(3), 640-5, database is CAplus.

Polyurethane formation from 4,4′-diphenylmethane diisocyanate [101-68-8] and diethylene glycol (I) [111-46-6] in the presence of Cu β-diketone complex catalysts proceeds via a coordination mechanism and depends to a significant degree on substituents on the ligands. The catalytic effect is associated with complexation with I. Activation of side reactions is not observed in the presence of the β-diketone complexes. The polyurethanes formed using these catalysts are more heat resistant than those formed in their absence. The catalytic activity of the Cu β-diketones is related to their Taft substituent constants

Vysokomolekulyarnye Soedineniya, Seriya A 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”