Tag: M.W=300-350

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”

Palaniandavar, M. published the artcileSpectral and electrochemical behavior of some copper(II) complexes with CuO₄ chromophore, Synthetic Route of 14284-06-1, the publication is Indian Journal of Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical Chemistry (1995), 34A(10), 803-8, database is CAplus.

A few mixed ligand complexes [Cu(TCA)(L)] [where TCA = trichloroacetate; HL = 2,2,6,6-tetramethyl-3,5-heptanedione (DPM), 2,6-dimethyl-3,5-heptanedione (DMHD) and o-hydroxybenzophenone (OHBP)] were prepared and characterized by IR, electronic and EPR spectra and compared with those of the corresponding CuL₂ and other [Cu(TCA)(L)] chelates [where HL = acetylacetone (ACAC), ethylacetoacetate (EAA), salicylaldehyde (SAL) and o-hydroxyacetophenone (OHAP)] to illustrate the nature of bonding of TCA with Cu(II). The Cu^II/Cu^I redox potentials of the bis-chelates vary in the order, DPM < MDHD < ACAC < EAA; SAL ≈ OHAP < OHBP; they shift towards more neg. values as the number of electron repelling Me groups increases. For mixed ligand complexes, the potentials are more pos. than those of their resp. bis-complexes and vary in the order, DPM > DMHD > ACAC > EAA; SAL < OHAP < OHBP. All the above results suggest that the replacement in L in CuL₂ by TCA decreases the delocalization of electron d., more in o-hydroxyarylcarbonyl rather than in β-diketonate complexes.

Indian Journal of Chemistry, Section A: Inorganic, Bio-inorganic, Physical, Theoretical & Analytical 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”