Category: 1271-19-8

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, COA of Formula: C10Cl2Ti, 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 Dunscomb, Rachel J.，once mentioned of 1271-19-8

Pyrazoles are an important class of heterocycles found in a wide range of bioactive compounds and pharmaceuticals. Pyrazole synthesis often requires hydrazine or related reagents where an intact N-N bond is conservatively installed into a pyrazole precursor fragment. Herein, we report the multicomponent oxidative coupling of alkynes, nitriles, and Ti imido complexes for the synthesis of multisubstituted pyrazoles. This modular method avoids potentially hazardous reagents like hydrazine, instead forming the N-N bond in the final step via oxidation-induced coupling on Ti. The mechanism of this transformation has been studied in-depth through stoichiometric reactions of the key diazatitanacyclohexadiene intermediate, which can be accessed via multicomponent coupling of Ti imidos with nitriles and alkynes, ring opening of 2-imino-2H-azirines, or direct metalation of 4-azadiene-1-amine derivatives. The critical transformation in this reaction is the 2-electron oxidation-induced N-N coupling on Ti. This is a rare example of formal N-N coupling on a metal center, which likely occurs through an electrocyclic mechanism analogous to a Nazarov cyclization. Conveniently, these 2-electron-oxidized diazatitanacyclohexadiene intermediates can be accessed via disproportionation of the 1-electron-oxidized species, which allows utilization of weak oxidants such as TEMPO

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Reference：
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， HPLC of Formula: C10Cl2Ti, Which mentioned a new discovery about 1271-19-8

The closo-[B12H(12-n)(OH)(n)]2- (n = 1-4) ions have been synthesized by the reaction of cesium dodecahydro-closo-dodecaborate(2-), Cs21, with aqueous sulfuric acid. Variation of the reaction temperature, time, and acid concentration results in the stepwise introduction of from one to four hydroxyl groups. Each individual hydroxylation step proceeds regioselectively, affording only one isomer per step. Further substitution of the hydroxylated cluster preferentially takes place at a B-H vertex meta to a B-OH vertex. The closo-[B12H(12-n)(OH)(n)]2- (n = 1-4) species, designated 2-5, respectively, are characterized by one- and two-dimensional 11B NMR spectroscopy, IR spectroscopy, and high-resolution fast atom bombardment (FAB) mass spectrometry. A rationale that qualitatively explains the influence of the hydroxyl group on the chemical shifts of the individual boron vertices is developed. Furthermore, the solid state structures of closo-[B12H11(OH)]2-, 2, and closo-1,7-[B12H10(OH)2]2-, 3, are determined by X-ray diffraction. Crystallographic data are as follows: For [MePPh3]22, monoclinic, space group P21/n, a = 890.1(5) pm, b = 1814(1) pm, c = 1270.5(7) pm, beta = 101.66(2), Z = 2, R = 0.055; for [MePPh3]23, monoclinic, space group P21/n, a = 887.6(4) pm, b = 1847.2(8) pm, c = 1271.1(5) pm, beta = 101.17(1), Z = 2, R = 0.065. In addition, synthetic routes to O-derivatized species of the anions 2-5 such as closo-[B12H11(OTiCpCl2)]2-, 7, closo-1,7[B12H10(OTiCpCl2)2]2-, 8, closo-1,7,9-[B12H9(OTiCpCl2)3]2-, 9, closo-[B12H11(OCONHPh)]2-, 10, and closo-1,7-[B12H10(OSO2Me)2]2-, 11, are described. The crystal structures of 7 and 11 are determined by single-crystal X-ray diffraction. Crystallographic data are as follows: For [MePPh3]27, monoclinic, space group Cc, a = 2530.5(2) pm, b = 1653.3(1) pm, c = 1281.3(1) pm, beta = 118.79(2), Z = 4, R = 0.085; for [HPy]211, monoclinic, space group P21/n, a = 1550.9(8) pm, b = 993.1(5) pm, c = 1726.5(9) pm, beta = 112.36(2), Z = 4, R = 0.061.

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Reference：
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, category: catalyst-ligand, 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 Albrecht, Norbert，once mentioned of 1271-19-8

A facile route to bis(eta-cyclopentadienyl)pentaselenido)metal complexes Cp2MSe5 (M=Ti (1), Zr (2), Hf (3)), starting with Cp2MCl2 and Li2Sex (x ca. 5), is described. 3 is readily oxidized to form the binuclear complex (mu2-O)(mu2-Se4)(Cp2Hf)2 (4) which has two different chalcogen bridges.The structures of 1-4 have been determined by X-ray crystallography.Despite having different space groups, compounds 1-3, have very similar molecular structures, i.e.MSe5 rings in the chair conformation. 1H NMR studies indicate that hindered ring inversions occur.The activation energies for 1 and 2 have been deduced from temperature-dependent spectra.

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Reference：
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， Product Details of 1271-19-8, Which mentioned a new discovery about 1271-19-8

Silyl enol ethers were produced by the carbonyl olefination of silyl esters with titanium carbene complexes generated by the desulfurizative titanation of thioacetals. The regioselective preparation of silyl dienol and trienol ethers has been achieved by using unsaturated silyl esters and thioacetals.

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

Reference of 1271-19-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1271-19-8, Name is Titanocenedichloride, molecular formula is C10Cl2Ti. In a Article，once mentioned of 1271-19-8

The N2 reduction reaction in the system (eta-C5H5)2TiCl2-Mg in tetrahydrofuran was examined.The 13C and 1H NMR results as well as the chemical properties of the products formed revealed that the reaction yielded a mixture of compounds in which the titanium atom was bonded both to the mu-(eta5: eta5-fulvalene) ligand and to the cyclopentadienyl ligands.In this system dinitrogen undergoes reduction to N3-, which then forms M3N bridges (M = Ti, Mg).The nitride nitrogen may readily be oxidized to imide nitride N-1, which may react further, e.g. with carbon monoxideto produce isocyanates, or, with excess oxidizing agent N2.THF in this system undergoes polymerisation.In addition, a – OC4H9 alkoxy group is formed which makes the substitution of the cyclopentadienyl group bonded to the titanium atoms possible.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 1271-19-8 is helpful to your research. Reference of 1271-19-8

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

Electric Literature 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

The amine-borane adduct iPr2NH·BH(C6F 5)2 (1) and the aminoborane iPr2N=B(C 6F5)2 (2) have been prepared and crystallographically characterised. Interconversion between the two compounds has been attempted using thermal and transition-metal-catalysed dehydrogenation and hydrogenation protocols and the overall reaction thermodynamics were probed by computational methods. Thermal dehydrogenation of 1 was found to yield 2, together with uncharacterised by-products. Treatment of 1 with the carbene 1,3-di-tert-butyl-4,5-dihydroimidazol-2-ylidene (3) under ambient conditions did not lead to the elimination of hydrogen, but instead to the loss of C 6F5H to afford iPr2N=B(H)C6F 5 (4). Attempts to hydrogenate aminoborane 2 were unsuccessful with no reaction observed either thermally or in the presence of transition-metal catalysts. A computational study of the interconversion between compounds 1 and 2 indicated a thermodynamically unfavourable hydrogenation reaction, which was inverse to that demonstrated for the analogous phosphane-borane/phosphanylborane pair, iPr2PH·BH(C6F5)2 (5) and iPr2P-B(C6F5)2 (6). The contrasting reactivity was attributed to the different N-B and P-B pi-bond strengths in 2 and 6, respectively. Interconversion between the amine-borane adduct iPr2NH·BH(C6F5)2 and the related aminoborane iPr2N=B(C6F5) 2 via hydrogen loss/uptake has been studied. Fundamental differences in reactivity from the analogous phosphane-borane/phosphanylborane system have been rationalised by DFT calculations. Copyright

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

Synthetic Route of 1271-19-8, In heterogeneous catalysis, the catalyst is in a different phase from the reactants. At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1271-19-8, name is Titanocenedichloride. In an article，Which mentioned a new discovery about 1271-19-8

Reaction of [Cp2TiCl2] with two equivalents of 2,4-pentanedione in the presence of one equivalent of NEt3 in CH3CN at room temperature yielded oxo-bridged binuclear titanium complex [{Ti(acac)2Cl}{TiCp2(Cl)}(mu-O)], which was characterized crystallographically and spectroscopically. Reaction mixture of oxo-bridged binuclear titanium complex and 2nBuLi catalytically activate the mixture of phenylsilane and aldehyde to yield O-silation products at room temperature.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.1271-19-8. In my other articles, you can also check out more blogs about 1271-19-8

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

Application 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

The reaction of a THF solution of a tolane complex of titanocene with benzaldehyde and acetone results in the formation of titanadihydrofuran metallacycles Cp2 and Cp2, respectively.The structure of the latter complex has been determined by X-ray analysis.

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Reference：
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 Weiss, Andre，once mentioned of 1271-19-8

The bridging functions Me2Si, [(CH2)3(CMe2)2N]B and CH2 have been used to connect two imidazoles in the 1,1?-position. The bisimidazolyl compounds were treated with BH3 or BEt3, and the resulting N,N?-bisborane-protected products 1, 3b, 4a, and 5b were characterized by X-ray structure analyses. Reaction of 1,1?-bis(4,5-dimethylimidazolyl) methane with BBr3 yielded the macrocyclic dicationic tetraimidazolyl compound 6. The behavior of the N-protected bisimidazoles 1 and 3-5 towards deprotonating agents was investigated and it was found that 1,1?-bis(3-borane-4,5-dimethylimidazolyl)methane (5b) is deprotonated to give a dianionic dicarbene compound. Its reaction with Cp2MCl2 allowed the formation of the corresponding titanocene and zirconocene complexes 8 and 9, which were characterized by X-ray structure analyses. In 9 a 3c,2e B-H-Zr bond is present. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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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. category: catalyst-ligand. 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

An efficient catalytic system involving in situ activation of kinetically inert titanocene dichloride with alcoholic solvent for the synthesis of quinazoline derivatives was developed. 1 mol% Cp2TiCl2 at 30 C afforded 17 examples of quinazoline derivatives with yields of 95-98% in 7-12 minutes. Mechanistic experiments using in situ NMR and HRMS established that the coordination of ethanol to the titanocene moiety released the catalytic species [Cp2Ti(OCH2CH3)2].

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