Tag: M.W:900-1000

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, is researched, Molecular C46H46O4P2Pd2, CAS is 172418-32-5, about Preparation and Physicochemical Properties of [6]Helicenes Fluorinated at Terminal Rings, the main research direction is fluorinated helicene preparation physicochem property.SDS of cas: 172418-32-5.

The first racemization-stable helicene derivatives fluorinated at terminal rings, 1,2,3,4-tetrafluoro[6]helicene and 1,2,3,4,13,14,15,16-octafluoro[6]helicene, were synthesized via the Wittig reaction followed by oxidative photocyclization in an overall yield of 41% and 76%. The changed electronic structure in fluorinated helicenes was reflected in a slight shift of UV-vis absorption, fluorescence excitation, and emission spectra maxima when compared to unsubstituted [6]helicene. Cyclic voltammetry revealed a moderate decrease in the HOMO-LUMO gap with increasing fluorination. The sp. rotation of tetrafluoro[6]helicene enantiomers was found to be approx. 25% lower than that of unsubstituted [6]helicene. The theor. study of the racemization barrier suggested a reasonable shift toward higher energy with increasing fluorination. The increasing fluorination also significantly affected the intermol. interactions in the crystal lattice. The observed CH···F interactions led to the formation of 1D-mol. chains in the crystal structures of both fluorinated helicenes.

Although many compounds look similar to this compound(172418-32-5)SDS of cas: 172418-32-5, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
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 preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ) is researched.Product Details of 14694-95-2.Labrum, Nicholas S.; Chen, Chun-Hsing; Caulton, Kenneth G. published the article 《A bis-Pyrazolate Pincer on Reduced Cr Deoxygenates CO2: Selective Capture of the Derived Oxide by CrII》 about this compound( cas:14694-95-2 ) in Chemistry – A European Journal. Keywords: chromium carbonate pyridylpyrazolate complex preparation crystal structure; deoxygenation carbon dioxide chromium pyridylpyrazolate dimer complex; CO2; aggregate; chromium; pincer; reduction. Let’s learn more about this compound (cas:14694-95-2).

Reduction of the bis-(pyrazolyl)pyridine complex [LCr]2 with stoichiometric KC8 in THF produces a species that is reactive with CO2 to produce an aggregate composed of paramagnetic K2L2Cr2(CO3) linked by KCl into a product of formula [K2L2Cr2(CO3)]4·2KCl. X-ray diffraction reveals a pincer hydrocarbon exterior and an inorganic interior composed of K+, Cl- and carbonate oxygens. Every Cr is five coordinate and square pyramidal, with the axial N donor weakly bonded to Cr due to the Jahn-Teller effect of a high spin d4 configuration. Reaction with 13CO2 confirms that carbonate here is derived from CO2, that oxide is derived from CO2, and that CO is indeed released, since it is not a competent ligand to CrII. Guiding principles for selectivity in CO2 reduction are deduced from the diverse successful mol. constructs to date.

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Reference:
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

Recommanded Product: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, is researched, Molecular C46H46O4P2Pd2, CAS is 172418-32-5, about Cyclic α-amino acids by Pd-mediated cycloisomerization and coupling reactions. Author is Moller, Bjorg; Undheim, Kjell.

Stereoselective syntheses of cyclic α-amino acids are described. The α-carbon of the amino acid is incorporated into a five- or six-membered vicinal dimethylenecycloalkane or conjugated methylenecycloalkene. Palladium-catalysis was used for cycloisomerization of intermediate enynes and intramol. Heck type cyclizations of bromodienes. A stereoselective elimination from a homoallylic Pd-intermediate is described. Enantiomerically pure substrates for the cyclization reactions were available by stepwise alkylations of the chiral auxiliary (R)-2,5-dihydro-3,6-dimethoxy-2-isopropylpyrazine with bromoalkenes and bromoalkynes.

Although many compounds look similar to this compound(172418-32-5)Recommanded Product: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, numerous studies have shown that this compound(SMILES:CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1), has unique advantages. If you want to know more about similar compounds, you can read my other articles.

Reference:
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 In Synthesis of Tris(triphenylphosphine)chlororhodium. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Stereoselective β-Mannosylation via Anomeric O-Alkylation with L-Sugar-Derived Electrophiles. Author is Hettiarachchi, Ishani Lakshika; Meng, Shuai; Chahine, Mira; Li, Xiaohua; Zhu, Jianglong.

A total synthesis of the trisaccharide repeat unit of Salmonella serogroup E1 O-antigen is reported. This synthesis features a key β-mannosylation reaction through a cesium carbonate-mediated anomeric O-alkylation of a partially protected D-mannose with an L-fucose-derived electrophile for the first time.

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Reference:
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

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 172418-32-5, is researched, SMILESS is CC1=C([P]2([Pd+2]3([CH2-]C4=C2C=CC=C4)[O-]/C(C)=O[Pd+2]5([O-]/C(C)=O3)[P](C6=C(C)C=CC=C6)(C7=C([CH2-]5)C=CC=C7)C8=C(C)C=CC=C8)C9=C(C)C=CC=C9)C=CC=C1, Molecular C46H46O4P2Pd2Journal, Organometallics called Synthesis and Reactivity of the Neutral Pyrazolate Complexes [M2{CH2C6H4P(o-tolyl)2-κC,P}2(μ-Rpz)2] (M = Pd, Pt; Rpz = Pz, 3,5-dmpz, 4-Mepz) toward AgClO4. Molecular Structure of [Pt2Ag{CH2C6H4P(o-tolyl)2-κC,P}2(μ-4-Mepz)2]ClO4, Author is Falvello, Larry R.; Fornies, Juan; Martin, Antonio; Sicilia, Violeta; Villarroya, Pablo, the main research direction is pyrazolato platinum palladium tolylphosphino cyclometalated preparation reaction silver perchlorate; crystal mol structure platinum silver bonded pyrazolato cyclometalated tolylphosphino; safety silver perchlorate reaction pyrazolato platinum palladium cyclometalated tolylphosphino.HPLC of Formula: 172418-32-5.

The neutral compounds [Pt2{CH2C6H4P(o-tolyl)2-κC,P}2(μ-Rpz)2] (Rpz = pz (2a), 3,5-dmpz (2b), 4-Mepz (2c)) react with AgClO4 in a 1:1 molar ratio to give the trinuclear compounds [Pt2Ag{CH2C6H4P(o-tolyl)2-κC,P}2(μ-Rpz)2]ClO4 (Rpz = pz (4a), 3,5-dmpz (4b), 4-Mepz (4c)), which contain two Pt-Ag bonds. The reaction of [Pd2{CH2C6H4P(o-tolyl)2-κC,P}2(μ-3,5-dmpz)2] (3b) with AgClO4 renders [{Pd2(CH2C6H4P(o-tolyl)2-κC,P)2(μ3-3,5-dmpz-N,N’,C4)2Ag(η2-μ2-ClO4)}2] (5), a palladium/silver compound with an unprecedented dmpz bridging ligand η1-bonded to the Ag centers, a coordination mode involving only the C4 atom of each dmpz ligand.

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Reference:
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

Related Products of 14694-95-2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Tris(triphenylphosphine)chlororhodium, is researched, Molecular C54H45ClP3Rh, CAS is 14694-95-2, about Endohedral Plumbaspherenes of the Group 9 Metals: Synthesis, Structure and Properties of the [M@Pb12]3- (M = Co, Rh, Ir) Ions. Author is Li, Ai-Min; Wang, Yi; Downing, Domonique O.; Chen, Fu; Zavalij, Peter; Munoz-Castro, Alvaro; Eichhorn, Bryan W..

The icosahedral [M@Pb12]3- (M = Co (1), Rh (2), Ir (3)) cluster ions were prepared from K4Pb9 and Co(dppe)Cl2 (dppe = 1,2-bis(diphenylphosphino)ethane)/[Rh(PPh3)3Cl]/[Ir(cod)Cl]2 (cod = 1,5-cyclooctadiene), resp., in the presence of 18-crown-6/2,2,2-cryptand in ethylenediamine/toluene solvent mixtures The [K(2,2,2-cryptand)]+ salt of 1 and the [K(18-crown-6)]+ salt of 3 were characterized via x-ray crystallog.; the ions 1 and 3 are isostructural and isoelectronic to the [Rh@Pb12]3- (2) ion as well as to the group 10 clusters [M’@Pb12]2- (M’ = Ni, Pd, Pt). The ions are all 26-electron clusters with near perfect icosahedral Ih point symmetry. Clusters 1-3 show record downfield 207Pb NMR chem. shifts due to σ-aromaticity of the cluster framework. Calculated and observed 207Pb NMR chem. shifts and 207Pb-xM J-couplings (xM = 59Co, 103Rh, 193Ir) are in excellent agreement and DFT anal. shows that the variations of 207Pb NMR chem. shifts for the [M@Pb12]2,3- ions (M = Co, Rh, Ir, Ni, Pd, Pt) are mainly governed by the perpendicularly oriented σ11 component of the chem. shift anisotropy tensor. The laser desorption ionization time-of-flight (LDI-TOF) mass spectra contain the mol. ions as well as several new gas phase clusters derived from the parents. The DFT-minimized structures of these ions are described.

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Reference:
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

Formula: C46H46O4P2Pd2. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: trans-Di-μ-acetatobis[2-[bis(2-methylphenyl)phosphino]benzyl]dipalladium, is researched, Molecular C46H46O4P2Pd2, CAS is 172418-32-5, about Comprehensive Kinetic Screening of Catalysts Using Reaction Calorimetry. Author is Blackmond, Donna G.; Rosner, Thorsten; Pfaltz, Andreas.

The protocol based on reaction calorimetry which is described in this paper offers a multidimensional kinetic and stability profile of a catalyst candidate in liquid and multiphase reactions. The scale-transparent picture of catalyst properties provided by this method should make it generally useful for rapid screening of candidates for catalytic process steps as well as for fundamental kinetic and mechanistic studies of organic reactions. In the example described here, new Pd complexes with nitrogen-based ligands were found to be more active than phosphapalladacycles in the Heck coupling of aryl halides with olefins.

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Reference:
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 of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Towards Visible-Light Photocatalytic Reduction of Hypercoordinated Silicon Species》. Authors are Levernier, Etienne; Leveque, Christophe; Derat, Etienne; Fensterbank, Louis; Ollivier, Cyril.The article about the compound:Tris(triphenylphosphine)chlororhodiumcas:14694-95-2,SMILESS:[Rh]Cl.P(C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.P(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6.P(C7=CC=CC=C7)(C8=CC=CC=C8)C9=CC=CC=C9).Quality Control of Tris(triphenylphosphine)chlororhodium. Through the article, more information about this compound (cas:14694-95-2) is conveyed.

Nowadays, the quest of new radical precursors based on heteroatom complexes occupies an increasingly prominent position in contemporary research. Herein, the authors studied the behavior and the limitations of hexa- or pentacoordinated organochlorosilanes and related pentacoordinated silyliums as new families of complexes for the generation of radicals under photocatalytic reductive conditions. Particularly, treatment of chloro(phenyl)bis[N,S-pyridine-2-thiolato(-)]silicon(IV) or the related silylium derivative with the fac-Ir(ppy)3 (5 mol-%)/NEt3 (1.5 equiv) system under blue LEDs irradiation generates a thiopyridyl radical which can participate in the formation of a C-S bond by reaction with an allylsulfone. Computational studies supported this exptl. finding, and particularly by showing that homolytic fragmentation of C-Ts bond is favored over the fragmentation of thiopyridyl radical.

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Reference:
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 preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Tris(triphenylphosphine)chlororhodium( cas:14694-95-2 ) is researched.Product Details of 14694-95-2.Shao, Huiling; Wang, Yuening; Bielawski, Christopher W.; Liu, Peng published the article 《Computational Investigations of the Effects of N-Heterocyclic Carbene Ligands on the Mechanism, Reactivity, and Regioselectivity of Rh-Catalyzed Hydroborations》 about this compound( cas:14694-95-2 ) in ACS Catalysis. Keywords: azaheterocyclic carbene ligand rhodium catalyzed hydroboration. Let’s learn more about this compound (cas:14694-95-2).

D. functional theory calculations were performed to study the effects of N-heterocyclic carbene (NHC) ligands on the Rh-catalyzed hydroboration of styrene and to identify factors controlling reactivity and regioselectivity. Our computational mechanistic investigations revealed that branched and linear hydroboration products are formed via mechanisms that involve the migratory insertions of styrene into Rh-H and Rh-B bonds, resp. Such reaction mechanisms are fundamentally different from those calculated for hydroborations catalyzed by Rh-phosphine complexes in which the styrene prefers to insert into the Rh-H bond regardless if the linear or branched product is formed. The calculated steric and electronic effects exhibited by the NHC ligands on the corresponding reaction rates and regioselective outcomes revealed that stronger electron-donor ligands promoted reactivity, and the steric bulk of the NHC ligands effectively controlled the regioselectivity of the hydroboration reaction. Generally, bulkier NHC ligands favor the formation of linear products and less sterically demanding NHC ligands favor the formation of branched products.

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Reference:
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

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 14694-95-2, is researched, Molecular C54H45ClP3Rh, about An insight into the coordination specificity of polyaromatic hydrocarbons (PAHs) grafted hydrazones towards rhodium(III), the main research direction is rhodium polyaromatic hydrocarbon complex preparation redox potential; frontier mol orbital rhodium polyaromatic hydrocarbon complex; crystal structure rhodium polyaromatic hydrocarbon complex.Application of 14694-95-2.

Upon treatment of the polyaromatic hydrocarbon (PAH) grafted hydrazones HL with [RhCl(PPh3)3], complexes of type [Rh(L)Cl2(PPh3)2] were isolated. The X-ray diffraction technique was used to elucidate the structures of three complexes. The rich spectral features of the complexes in the UV-vis region were explained by TD-DFT and their redox active nature has been validated from the well-defined responses at mild potentials as well as from a theor. investigation of the redox orbitals. Intra-mol. π-π stacking interactions coupled with the electron withdrawing ability of the pendant PAH moiety within the ligand framework play a significant role in altering the mode of coordination (flexidentate behavior of HL) as well as the metal-ligand bond parameters.

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Reference:
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