Tag: M.W:200-300

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Co-catalysis for one-pot tandem hydroformylation-aldol condensation-hydrogenation with involvement of phosphino-phosphonium based bi-functional ligand and aniline

Co-catalysis in the way of synergetic catalysis and sequential catalysis has emerged as a powerful tool to achieve one-pot tandem reaction. Herein, a tri-functional catalytic system containing phosphino-phosphonium bi-functional ligand (L2) based Rh-catalyst and aniline was developed for three-step tandem hydroformylation-aldol condensation-hydrogenation to produce ketones from olefins. It was found that the intramolecular bi-functionalities of phosphino-fragment and phosphonium [P(V)+] in L2 greatly facilitated hydroformylation due to their synergetic effect on activation of carbonyl ([sbnd]C[dbnd]O) in Rh-acyl intermediate. In addition, the phosphonium in L2 also served as a Lewis acid to catalyse condensation of acetone with aniline to form enamine catalyst. The latter with more nucleophilicity was able to attack the aldehydes (formed from the preceding hydroformylation) to accomplish the subsequent aldol condensation along with the release of aniline. Finally, the obtained alpha,beta-unsaturated ketones were hydrogenated to yield ketones over L2-based Rh-catalyst under the hydroformylation conditions. Such tri-functional catalytic system in combination of transition-metal catalysis, Lewis acid catalysis and enamine catalysis also exhibited good generality for the tandem hydroformylation-aldol condensation-hydrogenation of the different olefins to produce ketones.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn¡¯t involve a screen. 50777-76-9, C19H15OP. A document type is Article, introducing its new discovery., SDS of cas: 50777-76-9

New phosphine-amino-alcohol tridentate ligands for ruthenium catalyzed asymmetric transfer hydrogenation of ketones

New phosphine-amino-alcohol tridentate ligands (3a-c) and six new ruthenium complexes (4a-c and 5a-c) were synthesized and characterized. Catalytic activities of the metal complexes were tested on aryl alkyl ketones. All of the substrates were converted to related sec-alcohols in excellent yields (up to 99%), but enantioselectivities were insufficient (up to 40% ee). Despite the catalytic performance of 5a-c complexes can be considered as better than 4a-c, actually the catalytic activity of the complexes has been differed according to substrate. The ketones with less positive carbonyl carbons tend to give S-configuration with 5a-c and R-configuration with 4a-c. The catalytic performance of the complexes was rationalized by means of DFT calculations.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.7650-91-1, Name is Benzyldiphenylphosphine, molecular formula is C19H17P. In a Article£¬once mentioned of 7650-91-1, Safety of Benzyldiphenylphosphine

Olefination reactions through phosphazenes

The first synthesis of di-, tri- and tetrasubstituted alkenes through reaction of lithium P-diphenyl(alkyl)(N-carboxymethyl)phosphazenes with aldehydes and ketones is reported.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, SDS of cas: 224311-51-7.

Synthesis, reaction and catalysis of heterodinuclear organoplatinum or palladium complexes having M-M’ and M-C bonds without M-M’ connecting ligand

Synthesis, reactions, and catalyses of heterodinuclear organometallic complexes without connecting ligands L2RM-ML’n (M=Pt, Pd; M’=Mo, W, Mn, Re, Fe, Co) are described. They are regarded as a simplest model for studying the cooperative effect of two transition metals in catalysis. Organic ligand R is found to move reversibly from M to M’ along M-M’ bond, which is accelerated by addition of electron-deficient olefins. The reaction is regarded as a reductive elimination of M’-R and the reverse process as oxidative addition reaction. The results may mimic the mobility of sigma-bound organic group on heterogeneous surface. Visible light enhances reductive elimination (alkyl group transfer) in (tBu2bpy)Me2PhPt-Mn(CO)5. Enhanced CO insertion of heterodinuclear methylpalladium-cobalt system in comparison with mononuclear systems is presented and the mechanism is found to involve alkyl transfer followed by CO insertion into the Co-C bond and oxidative addition of sigma-organic groups along heterometal-metal bond. Highly specific C-S bond cleavage reactions of heterodinuclear complex with thiiranes and thietanes are presented. Catalytic reactions such as carbonylation of thietane, copolymerization of aziridine and CO, and insertion of olefin or acetylene into Mo(or W)-H bond promoted by heterodinuclear complexes were described, where enhanced catalytic activity has been shown.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.SDS of cas: 224311-51-7. In my other articles, you can also check out more blogs about 224311-51-7

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.7650-91-1, Name is Benzyldiphenylphosphine, molecular formula is C19H17P. In a Article£¬once mentioned of 7650-91-1, Recommanded Product: Benzyldiphenylphosphine

ELECTROCHEMICAL SYNTHESIS OF TERTIARY PHOSPHINES FROM ORGANIC HALIDES AND CHLOROPHOSPHINES

The electrochemical synthesis of a wide range of tertiary mono- and diphosphines has been achieved in very simple and mild conditions, in an undivided electrolytic cell with a sacrificial anode of magnesium.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, molecular formula is C20H27P, belongs to chiral-phosphine-ligands compound, is a common compound. In a patnet, once mentioned the new application about 224311-51-7, Safety of 2-(Di-tert-Butylphosphino)biphenyl

A Reflectron Time-of-Flight Mass Spectrometer with a Nano-Electrospray Ionization Source for Study of Metal Cluster Compounds

An experiment facility has been set up for the study of metal cluster compounds in our laboratory, which consists of a nano-electrospray ionization source, an ion transmission and focus system, and a reflectron time-of-flight mass spectrometer. Taking advantage of the nano-electrospray ionization source, polyvalent ions are usually produced in the “ionization” process and the obtained mass resolution of the equipment is over 8000. The molecular ion peaks of metal cluster compounds [Au20(PPhpy2)10Cl2](SbF6)4, where PPhpy2=bis(2-pyridyl)phenylphosphine, and [Au6Ag2(C)L6](BF4)4, where L=2-(diphenylphosphino)-5-methylpyridine, are distinguished in the respective mass spectrum, accompanied by some fragment ion peaks. In addition, the mass-to-charge ratios of the parent ions are determinated. Preliminary results suggest that the device is a powerful tool for the study of metal cluster compounds. It turns out that the information obtained by the instrumentation serves as an essential supplement to single crystal X-ray diffraction for structure characterization of metal cluster compounds.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 50777-76-9, An article , which mentions 50777-76-9, molecular formula is C19H15OP. The compound – 2-(Diphenylphosphino)benzaldehyde played an important role in people’s production and life.

The novel water-soluble chiral PNNP-type ligand for the enantioselective reduction of ketones in aqueous media

The condensation of o-(diphenylphosphino)benzaldehyde and (R,R)-1,2-diaminocyclohexane in dichloromethane gives a diiminodiphosphine ligand, which is reduced with excess NaBH4 in refluxing ethanol to afford the corresponding diaminodiphosphine ligand [(R,R)-C6P2(NH)2]. The novel water-soluble PNNP-type tetradentate diaminodiphosphine ligand [(R,R)-C6P2(NH)2(SO3Na)4] has been prepared by the sulfonation of the chiral ligand [(R,R)-C6P2(NH)2] and also characterized by IR, NMR and CD. The water-soluble iridium catalyst is generated in situ from [IrCl(COD)(Ph3P)] and water-soluble ligand [(R,R)-C6P2(NH)2(SO3Na)4] in a mixture solvent of 2-propanol and water. This water-soluble iridium catalytic system has been examined for asymmetric transfer hydrogenation of various aromatic ketones in aqueous media, giving the corresponding optically active alcohols in high yield and excellent enantioselectivity. Even those ketones having a great bulkiness of the alkyl group, such as isobutyrophenone, phenyl cyclohexyl and 1,1-diphenylacetone, are smoothly converted to optically active alcohols in up to 99% ee.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 50777-76-9, An article , which mentions 50777-76-9, molecular formula is C19H15OP. The compound – 2-(Diphenylphosphino)benzaldehyde played an important role in people’s production and life.

Synthesis and reactivity of N,N’-bis

The condensation of a racemic mixture of 2,2′-diamino-1,1′-binaphthylene with two equivalents of o-(diphenylphosphino)benzaldehyde gives a racemic mixture of N,N’-bis in CH2Cl2 gives Cu(Binap-P2N2)Br (II) and (III) in 60percent and 74percent yield, respectively.In II the Binap-P2N2 ligand acts as a tridentate chelating agent, with the two phosphino groups and one of the two imino groups coordinated to the Cu, whereas in III it acts in tetradentate chelating mode.A variable temperature 31P<1H> NMR study of II reveals that the coordinated and the uncoordinated imino groups of the tridentate Binap-P2N2 ligand undergo a facile intramolecular exchange even at -55 deg C.The interaction of I with one equivalent of AgBF4 in CH2Cl2 gives (IV) in 79percent yield.In IV, the Binap-P2N2 ligand acts as a tridentate chelating agent, with the two phosphino groups and one of the two imino groups coordinated to the Ag.The structure of IV has been established by an X-ray diffraction study.The distance between Ag and N(2) is 2.56(1) Angstroem, and the non-bonding distance between Ag and N(1) is > 3.0 Angstroem.Key words: Silver; Copper; Imine; Multidentate ligands; Crystal structure

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Application of 224311-51-7, An article , which mentions 224311-51-7, molecular formula is C20H27P. The compound – 2-(Di-tert-Butylphosphino)biphenyl played an important role in people’s production and life.

Arylic C-X bond activation by palladium catalysts: Activation strain analyses of reactivity trends

We have quantum chemically explored arylic carbon-substituent bond activation via oxidative insertion of a palladium catalyst in C6H5X + PdLn model systems (X = H, Cl, CH3; Ln = no ligand, PH3, (PH3)2, PH2C2H4PH2) using relativistic density functional theory at ZORA-BLYP/TZ2P. Besides exploring reactivity trends and comparing them to aliphatic C-X activation, we aim at uncovering the physical factors behind the activity and selectivity. Our results show that barriers for arylic C-X activation are lower than those for the corresponding aliphatic C-X bonds. However, trends along bonds or upon variation of ligands are similar. Thus, bond activation barriers increase along C-Cl < C-H < C-C and along Pd < Pd(PH3) or Pd(PH2C2H4PH2) < Pd(PH3)2. Activation strain analyses in conjunction with quantitative molecular orbital theory trace these trends to the rigidity and bonding capability of the various C-X bonds, model catalysts, and ligands. I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 224311-51-7, help many people in the next few years., Application of 224311-51-7

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate

Electric Literature of 224311-51-7, An article , which mentions 224311-51-7, molecular formula is C20H27P. The compound – 2-(Di-tert-Butylphosphino)biphenyl played an important role in people’s production and life.

Recent Advances in the Synthesis of C?S Bonds via Metal-Catalyzed or -Mediated Functionalization of C?H Bonds

Sulfur-containing organic molecules play a prominent role in chemistry and biology. The presence of sulfur atoms is essential for the structure and thus the activity of many proteins. Sulfur-based compounds are used as pharmaceuticals, agrochemicals, or for materials with interesting physical or electronic properties. The synthesis of the C?S bond via the selective activation of C?H bonds is becoming an increasingly attractive alternative to classical procedures based on prefunctionalized starting materials. Within the last decade, significant progress has been made in this field. This review covers recent advances in the field of C?S bond-forming reaction via metal-catalyzed functionalization of C?H bonds and the utilization of these methods in the construction of sulfur-containing heterocycles. Problems often associated with organosulfur compounds as well as limitations of the current methods and future areas of research in this field will be discussed.

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Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate