Category: 224311-51-7

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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.

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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

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

Reference£º
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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Reference£º
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

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Mixed tridentate pi-donor and monodentate pi -acceptor ligands as chelating systems for rhenium-188 and technetium-99m nitrido radiopharmaceuticals

A new molecular metallic fragment for labeling biologically active molecules with99mTc and188Re is described. This system is composed of a combination of tridentate pi-donor and monodentate pi-acceptor ligands bound to a [M=N]2+ group (M =99m Tc,188Re) in a pseudo square-pyramidal geometry. A simple structural model of the new metallic fragment was obtained by reacting the ligand 2, 2?-iminodiethanethiol [H2NS2 = NH(CH2CH2SH)2] and monodentate tertiary phosphines with the [M=N]2+ group (M =99m Tc,188Re). In the resulting complexes (dubbed3+1complexes), the tridentate ligand binds the [M=N]2+ core through the two deprotonated, negatively charged, thiol sulfur atoms and the neutral, protonated, amine nitrogen atom. The residual fourth position of the five-coordinated arrangement is occupied by a phosphine ligand. The chemical identity of these model99m Tc and188Re compounds was established by comparison with the chromatographic properties of the corresponding complexes obtained at the macroscopic level with the long?lived 99gTc and natural Re isotopes. The investigation was further extended to comprise a series of ligands formed by simple combinations of two basic amino acids or pseudo-amino acids to yield potential tridentate chelating systems having [S, N, S] and [N, N, S] as sets of pi-donor atoms. Labeling yields and in vitro stability were investigated using different ancillary ligands. Results showed that SNS-type ligands afforded the highest labeling yields and the most robust 3+1 nitrido complexes with both99m Tc and188Re. Thus, the new chelating system can be conveniently employed for labeling peptides and other biomolecules with the [M=N]2+ group.

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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.224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, molecular formula is C20H27P. In a Patent£¬once mentioned of 224311-51-7, Recommanded Product: 2-(Di-tert-Butylphosphino)biphenyl

HETEROCYCLIC COMPOUND

Provided is a compound having a superior FLAP inhibitory action and useful as a prophylactic or therapeutic agent for arteriosclerosis and the like, and a salt thereof. The present invention relates to a compound represented by the formula wherein each symbol is as defined in the present DESCRIPTION, or a salt thereof.

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Reference£º
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

Reference of 224311-51-7. 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

Aggregation-induced emission behavior of a pincer platinum(II) complex bearing a poly(ethylene oxide) chain in aqueous solution

An amphiphilic pincer platinum(II) complex with a poly(ethylene oxide) (PEO) chain exhibited aggregation-induced emission (AIE) because of micelle formation in water. The AIE activity was enhanced by the addition of 1,3,5-benzenetricarboxylic acid, which induced micelle formation through hydrogen-bonding interactions with the PEO chain.

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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

Reference of 224311-51-7, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, molecular formula is C20H27P. In a patent, introducing its new discovery.

A DFT and crystallographic reinvestigation of the [L2RuC 2B7H9] and [L3RuC2B 7H9] ‘hypercloso’ and closo systems

A reinvestigation of the [LRuC2B7H9] ‘hypercloso’ 10-vertex cluster compounds, where L = PPh3, PEt 3, which were first reported some 30 years ago, has been carried out. At that time no single-crystal X-ray diffraction structural analysis was obtained for the compounds and their description as featuring a ‘hypercloso’ cluster constitution, where the descriptor hypercloso is defined as being a closed polyhedral structure possessing n skeletal bonding electron pairs, where n is the number of vertices, was largely based on a combination of chemical and NMR spectroscopic evidence, together with the application of Polyhedral Skeletal Electron Pair Theory as it was then understood. Reported here is a single-crystal Xray diffraction study of the PPh3 ligated ruthenacarborane allied with density functional calculations (DFT). The cluster structure is shown to be of isocloso geometry, albeit with considerable distortion towards isonido. Addition of excess PMe3 leads to the formation of an [(PMe 3)3RuC2B7H9] species of conventional 10-vertex closo geometry but it undergoes a cluster rearrangement, resulting in a different isomer to that originally proposed. 2011 Elsevier Ltd.

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Reference£º
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.224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, molecular formula is C20H27P. In a Review£¬once mentioned of 224311-51-7, SDS of cas: 224311-51-7

Merging metallic catalysts and sonication: A periodic table overview

This account summarizes and discusses recent examples in which the combination of ultrasonic waves and metal-based reagents, including metal nanoparticles, has proven to be a useful choice in synthetic planning. Not only does sonication often enhance the activity of the metal catalyst/reagent, but it also greatly enhances the synthetic transformation that can be conducted under milder conditions relative to conventional protocols. For the sake of clarity, we have adopted a structure according to the periodic-table elements or families, distinguishing between bulk metal reagents and nanoparticles, as well as the supported variations, thus illustrating the characteristics of the method under consideration in target synthesis. The coverage focuses essentially on the last decade, although the discussion also strikes a comparative balance between the more recent advancements and past literature.

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Reference£º
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.224311-51-7, Name is 2-(Di-tert-Butylphosphino)biphenyl, molecular formula is C20H27P. In a Review£¬once mentioned of 224311-51-7, name: 2-(Di-tert-Butylphosphino)biphenyl

In memory of Prof. Venkataraman: Recent advances in the synthetic methodologies of flavones

Flavones are present in a variety of medicines and natural products and are important structural motif due to their unique mode of physiological action. Hence the structural importance of flavone moiety has elicited a great deal of interest in the field of organic synthesis and chemical biology to develop some new and improved synthesis of this molecular skeleton. Herein, we have described an up to date overview on the recent advances in the diverse synthetic methodologies of flavones. The review covers the basic conceptual and practical catalytic synthesis like carbonylative annulation, cyclodehydration, Suzuki Miyaura coupling, Heck coupling, green methodologies, metal catalyzed reactions, organocatalytic transformations, microwave irradiation, etc. which are significant for constructing flavone skeleton. This review will satisfy the expectations of readers who are interested in the development of the field and looking for an update. It will stimulate researchers to develop new and creative synthetic access to this heterocyclic system, which will be instrumental in the advancement of flavone chemistry.

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Reference£º
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