Category: 1271-19-8

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Synthesis and reactivity against Cp2TiCl of 4-isoprenyl-beta-lactams. Trapping of N-titanoimidoyl radicals from cyanoformyl-2-azetidinones

A Staudinger reaction between methoxyketene and two different imines formed from citral afforded, after chemical transformation, the (E/Z)-4-alkenylepoxy-2-azetidinones 2, 3 and 4. These compounds, by reaction with Cp2TiCl, did not cyclize to afford the expected polycyclic beta-lactams, but the corresponding allylic alcohols 12, 13 and 15 were obtained instead. Unexpectedly, the treatment of cyanoepoxide (E)-3 with Cp2TiCl also gave the hydroxyl aldehyde (E)-14 whose formation suggests to us that a possible radical reduction of the cyano group might have occurred, and we lastly succeeded in the capture of the N-titanoimidoyl radicals. The behaviour observed for the isoprenoid side chain in the Staudinger reaction, the reactions with Cp2TiCl, as well as the trapping of N-titanoimidoyl radicals generated from benzocyanoformyl-2-azetidinones with the Ti(III) reagent, are discussed.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1271-19-8, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a article£¬once mentioned of 1271-19-8

Synthesis and Characterization of Hydrazone and Azine Derivatives of Bis(cyclopentadienyl)titanium(IV)

Pentacoordinated hydrazone and azine derivatives of bis(cyclopentadienyl)titanium(IV) of the type <(OC6H4CR:NNHR')TiCl(Cp)2> and <(OC6H4CR'':NN:CR''C6H4O)Ti(Cp)2>, where R=H or CH3, R’=H, C6H5 or C6H3(NO2)2 and R”=H or CH3 have been prepared.The products were characterized by chemical analyses, electrical conductance, IR, 1H NMR, and electronic spectral studies.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 1271-19-8, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article£¬once mentioned of 1271-19-8

(NH)-phosphanylamido- and (PH)-phosphoraneiminato transition-metal complexes: Syntheses, structures, and computational studies

Reactions of aminobis(diorganylamino)phosphanes (R2N)2PNH2 (R = iPr (a), Cy (b)) with Cp2MCl2 (M = Ti, Zr, Hf), CpTiCl3, and TiCl4 lead to the formation of the transition-metal complexes (R2N)2PN(H)MCp2Cl (M = Ti (1b), Zr (2a,b), Hf (3a,b)) (R2N)2P(H)NTiCpCl2 (8a,b), and (R2N)2P(H)NTiCl3 (10a,b), respectively. The influence of electronic effects of the metal fragment on the resulting equilibrium between the (NH)-phosphanylamido and the tautomeric (PH)-iminophosphorane form is presented in detail. Computational studies unambiguously confirm the experimental results. The molecular structures of 2a, 3a, and 8b have been determined by single-crystal X-ray diffraction.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, SDS of cas: 1271-19-8, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article, authors is Murr, Nabil El£¬once mentioned of 1271-19-8

ELECTROCHEMICAL BEHAVIOUR OF TITANOCENE DIHALIDES UNDER CO PRESSURE, ELECTROGENERATION OF TITANOCENE CARBONYL DIHALIDE ANIONS AND TITANOCENE DICARBONYL

Cyclic voltammetry of Cp2TiX2 (X=Cl and Br) in THF under CO pressure shows that a chemical reaction with CO accompanies the addition of the first electron to the titanocene dihalides.Electrolysis gave, after the transfer of one electron and a decrease of CO pressure, solutions which exhibited two ESR signals.Electrolysis of these solutions at -1.8 V gave Cp2Ti(CO)2 in high yield after the transfer of a second electron and the absorption of CO.A scheme involving the generation of anions such as (Cp2Ti(CO)X2)- is suggested to explain the results.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1271-19-8, name is Titanocenedichloride, introducing its new discovery. name: Titanocenedichloride

Ancillary ligand control of the regiochemistry of coupling of 3,3-dimethyl-1-butyne at titanium metal centers

The ambient-temperature sodium amalgam (2 Na per Ti) reduction of hydrocarbon solutions of [Cp(ArO)TiCl2] (ArO = 2,3,5,6-tetraphenylphenoxide) (1) in the presence of 3,3-dimethyl-1-butyne yields the 2,5-di(tert-butyl)titanacyclopentadiene compound [Cp(ArO)Ti(C4H2Bu2t-2,5)] (2). An X-ray diffraction study of 2 confirms the regiochemistry and shows carbon – carbon distances of 1.343(3) and 1.492(3) A for the double and single bonds, respectively. In contrast the analogous reaction of either [Cp2TiCl2] or [(ArO)2TiCl2] in the presence of 3,3-dimethyl-1-butyne yields the corresponding 2,4-di(tert-butyl)titanacyclopentadiene compounds. When 2 is heated at 100 C for a few days in C6D6 solution, isomerization to the more stable 2,4-di(tertbutyl) regioisomer 3 is observed by NMR. An attempt is made to rationalize the regiochemistry of the kinetically formed titanacyclopentadiene in terms of steric factors within the intermediate bis(alkyne) complex.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1271-19-8 is helpful to your research. name: Titanocenedichloride

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. Safety of Titanocenedichloride. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1271-19-8

Synthesis and structures of titanium and yttrium complexes with N,N?-tetramethylguanidinate ligands: Different reactivity of the M-N bonds toward phenyl isocyanate

A salt elimination reaction of bis(cyclopentadienyl)titanium dichloride (C5H5)2TiCl2 with one equiv. of N,N?-tetramethylguanidinate lithium [LiNC(NMe2)2] proceeded in THF at room temperature to yield a bis(cyclopentadienyl)titanium mono-guanidinate chloride (C5H5) 2TiCl(NC(NMe2)2) (1). However, treatment of two equiv. of LiNC(NMe2)2 with (C5H 5)2TiCl2 under the same conditions resulted in the elimination of one cyclopentadienyl ring to form an unexpected mono(cyclopentadienyl)titanium bis(guanidinate) chloride (C5H 5)TiCl[NC(NMe2)2]2 (2), in which only one Ti-Cl bond is broken, with the other Ti-Cl bond retained. Reaction of [(C5H5)2YCl]2 with LiNC(NMe 2)2 gave the corresponding product {(C5H 5)2Y[mu-eta1:eta2-NC(NMe 2)2]}2 (3). On further investigations on the reactivity of 1-3 toward phenyl isocyanate, we found phenyl isocyanate only inserts into the Y-N(mu-Gua) bonds of 3 to yield [(C5H 5)2Y(mu-eta1:eta2- OC(NC(NMe2)2)NPh)]2 (4). Complexes 1-4 were characterized by elemental analysis and spectroscopic properties and their solid-state structures were determined by X-ray single-crystal diffraction.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 1271-19-8, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a article£¬once mentioned of 1271-19-8

Carbon-carbon bond formation in the reductive coupling of trifluoroacetonitrile and pentafluorobenzonitrile – Synthetic routes to new perfluoroalkyl- and perfluoroaryl-substituted alpha-diimines: Versatile synthons for heterocycle synthesis

Reductive coupling of perfluoroalkyl- and perfluoroaryl-nitriles with [(eta5-C5H5)2TiCl]2 provides the corresponding mu-diiminatodititanium complexes. Protonolysis of the Ti-N bonds with ethereal HCl liberates the corresponding perfluoroalkyl- and perfluoroaryl-substituted alpha-diimines, two of which have been fully characterized by IR, 1H and 13C NMR, and X-ray crystallography.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1271-19-8, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article£¬once mentioned of 1271-19-8

A novel approach to the enantioselective formal synthesis of pumiliotoxin 251D

An efficient enantioselective synthesis of the indolizidine framework 9 of pumiliotoxin 251D in good yield by using a Lewis acid (cat.)-promoted diastereoselective addition of ethyl lithiopropiolate to ketone 7 derived from L-proline as a key step is reported. Hydrogenation of the addition product 8a gave the desired lactam 9. At the same time the 8-epimer of 9 was synthesized for the first time.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1271-19-8, name is Titanocenedichloride, introducing its new discovery. name: Titanocenedichloride

Titanocene-catalyzed multicomponent coupling approach to diarylethynyl methanes

A titanocene-catalyzed multicomponent coupling to provide diarylethynyl methanes is described. By combining the multifunctionality of Cp 2TiCl2 with the traceless dielectrophilicity of aryl aldehydes, all-carbon tertiary centers are obtained in 55-99% yield.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Recommanded Product: 1271-19-8, Which mentioned a new discovery about 1271-19-8

Synthesis and characterization of (cyclopentadienyl)titanium(IV) complexes of 1,3-dihydro-1,3-dioxo-alpha-(substituted)-2H-isoindole 2-acetates

Complexes having the general formulae (C5H5)2TiCl(L), C5H5)TiCl(L)2 and (C5H5)2Ti(L)2, have been synthesized by the reactions of N-protected amino acids (LH), (where R = -H, -CH(CH3)2, -CH2C6H5, -CH2CH2SCH3 and -CHR- = -CH2CH2-) with titanocene dichloride in the presence of triethylamine in refluxing tetrahydrofuran.These derivatives have been characterized by elemental analyses, molecular weight measurements, and IR, 1H and 13C NMR spectral studies.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI