Tag: M.W:200-300

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9-Amino-9-deoxyepiquinine efficiently catalyzed the double-conjugate addition of malononitrile to dienones. A number of 1,1,2,6-tetrasubstituted cyclohexanones were prepared in good yields, diastereoselectivities, and excellent enantioselectivities.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Chemistry graduates have much scope to use their knowledge in a range of research sectors, including roles within chemical engineering, chemical and related industries, healthcare and more. An article , which mentions category: chiral-oxygen-ligands, molecular formula is C17H14O. The compound – 1,5-Diphenylpenta-1,4-dien-3-one played an important role in people’s production and life., category: chiral-oxygen-ligands

Spiroannulation has been achieved by double Michael reaction under very mild conditions using a phase transfer catalyst.Various cyclohexanone molecules having different steric requirements have been condensed with 1,5-diphenyl-1,4-pentadien-3-one in the presence of cetyltrimethylammonium bromide.This condensation reaction was found to be diastereospecific as well as regiospecific.Stereoisomers derived from homotopic cycloalkanones were found to adopt endo geometry, while diastereotopic cycloalkanones were found to elaborate a mixture of endo and exo diastereomers.These stereochemical inferences are drawn based on extensive 2D-nmr studies employing COSY and NOESY experiments.

The result showed that such a combination of chemo- and biocatalysis improved the catalytic yield more than two times compared with that of sole metal catalysis.I hope my blog about 538-58-9 is helpful to your research. category: chiral-oxygen-ligands

Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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A palladium-catalyzed intermolecular vicinal diarylation of terminal 1,3-dienes using aryldiazonium tetrafluoroborates and arylboronic acids is reported. Using this technology, two different arenes are regioselectively introduced in a vicinal fashion across the terminal alkene of a variety of terminal 1,3-dienes at ambient temperature. Through the action of a chiral bicyclo[2.2.2]octadienyl ligand at -20 C, good enantioselectivity has also been achieved.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Human therapeutic treatment compositions comprise at least two of a curcumin component, a harmine component, and an isovanillin component, and preferably all three in combination. The agents are effective for the treatment of human conditions, especially human cancers.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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Though the M3- or M4 face of palladium clusters may serve as the active binding site of substrates, it has been difficult to elucidate their substrate binding modes in solution. Here, it was proved that a soluble Pd3- or Pd4 sheet cluster accommodates vinylarenes at its bridging coordination site in an unusual mode in palladium chemistry; that is, for the former, the coordination of the arene moiety precedes that of olefin moiety; for the latter, vinylarene coordinates to a distorted Pd4 sheet through oxidative pi-addition of its styrene moiety.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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By means of 17O NMR spectroscopy a large series of mono- and polycyclic aromatic ketones was studied in DMSO medium.A linear correlation between chemical shifts of the carbonyl group in 13C and 17O NMR spectra was found.We have established that the 17O chemical shift in ketones in their ordinary state reflects a tendency for reduction in basicity with decrease of the electronic density at the oxygen atom.It is shown that the basicity of aromatic ketones is affected by the degree of delocalization of ?-electron density both in the neutral and in the protonated form, and also by steric effects.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Safety of 1,5-Diphenylpenta-1,4-dien-3-one, New discoveries in chemical research and development in 2021. In homogeneous catalysis, catalysts are in the same phase as the reactants. A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes. 538-58-9, Name is 1,5-Diphenylpenta-1,4-dien-3-one, molecular formula is C17H14O. belongs to chiral-oxygen-ligands compounds. In a Article，once mentioned of 538-58-9

The reaction between dibenzyl-ideneacetone (dba) and tri-isopropyl sulfoxonium tetra-fluoro-borate has been reinvestigated. The stereochemistry of the major diasteromeric bis-(gem-dimethyl-cyclo-propane) adduct has now been assigned as [(1RS,3RS)-2,2-dimethyl-3-phenyl-cyclo-prop-yl][(1SR,3SR)-2,2- dimethyl-3-phenyl-cyclo-prop-yl]methanone, C23H26O, by X-ray crystallographic studies on a twinned crystal. The asymmetric unit contains two ml-ecules of the adduct, the conformations of which differ in the orientation of the phenyl ring relative to the adjacent cyclo-propanated double bond. The carbonyl groups of each adduct are aligned approximately along the a axis and in opposite directions to each other. The mol-ecules pack to give a sinusoidal pattern along the b axis. This is the first acyclic bis-(dimethyl-cyclo-prop-yl) ketone for which an X-ray crystal structure determination has been reported, and is also the first bis-cyclo-propanated dba analogue. The knowledge that the major diastereomer has the meso structure (and therefore the confirmation that the minor isomer is the racemate) will prove invaluable in future studies to utilize bis-(dimethyl-cyclo-prop-yl) ketones as reagents, in rearrangement processes, and as potential ligands and ligand precursors in organometallic chemistry.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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An efficient method for the synthesis of spirooxindolopyrrolizidine/ spirooxindolothiapyrrolizidine by the 1,3-dipolar cycloaddition of azomethine ylides generated via, decarboxylative condensation of 1,2-dicarbonyl compounds and l-proline/l-thiaproline/sarcosine with chalcones at ambient conditions with excellent yields has been described.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

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A novel RhCl(PPh3)3/BF3·OEt2 co-promoted direct C-C cross-coupling of primary and secondary alcohols at beta-position with aldehyde was developed. This reaction could provide an efficient synthesis of a series of alpha,beta-unsaturated aldehydes and diarylidene ketones, just from simple and easily available alcohols and aldehydes.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

New Advances in Chemical Research, May 2021. The prevalence of solvent effects in heterogeneous catalysis in condensed media has motivated developing quantitative kinetic and spectroscopic. An article , which mentions COA of Formula: C17H14O, molecular formula is C17H14O. The compound – 1,5-Diphenylpenta-1,4-dien-3-one played an important role in people’s production and life., COA of Formula: C17H14O

Irradiation of trans-1-benzoyl-2-trans-styrylcyclopropane (IIa) and trans-1-p-toluoyl-2-trans-styrylcyclopropane (IIb), leads to formation of cis disubstituted cyclopropanes (IIIa) and (IIIb) respectively.However, photolysis of trans-1-trans-cinnamoyl-2-phenylcyclopropane (IV) results in isomerzation of the alpha,beta-double bond to produce V.Photolysis of trans-1-trans-p-methoxycinnamoyl-2-p-methoxyphenylcyclopropane (VI), by contrast, produces only a cyclobutane dimer formulated as (VII).Irradiation of 7-phenyl-3-benzylidenespiro<2.5>octan-2-one (IXb), under identical conditions, leads to isomerisation around the C=C bond.The structural assignments are based, interalia, on 13C NMR and 1H NMR spectral data.

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Reference：
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate