Category: 1271-51-8

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INFLUENCE OF EXPERIMENTAL CONDITIONS ON THE CYCLIC VOLTAMMETRIC RESPONSE OF MULTILAYER SURFACE MODIFIED ELECTRODES, II EFFECT OF COUNTER ION CONCENTRATION, TEMPERATURE AND SWEEP RATE

The combined effect of counter ion concentration, temperature and sweep rate on the cyclic voltammetric response of multilayer modified electrodes has been studied on the basis of data obtained for tetracyanoquinodimethane and poly(vinyl-ferrocene) polymer film electrodes, as well as for modified Ni electrode.It is established that the counter ion concentration influences to a great extent the cyclic voltammetric response, which is probably due to the swelling of the polymer film.With increasing counter ion concentration a shrinkage of the polymer layer and accordingly, an increase in the concentration of redox sites in the film occurs.Although this may cause an increase in the rate of electron exchange between the neighbouring redox sites, permeability of the film in respect to the solvent and ions decreases.This effect may be the reason for a diffusional behaviour which can be observed on using concentrated supporting electrolytes even at low sweep rates and high temperatures.The apparent activation energy of the electrochemical steps depends on the counter ion concentration and sweep rate.On the basis of the temperature dependence of peak potentials, an estimate can be made for sweep rate at which surface behaviour can be expected.

INFLUENCE OF EXPERIMENTAL CONDITIONS ON THE CYCLIC VOLTAMMETRIC RESPONSE OF MULTILAYER SURFACE MODIFIED ELECTRODES, II EFFECT OF COUNTER ION CONCENTRATION, TEMPERATURE AND SWEEP RATE

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Application of 1271-51-8, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 1271-51-8, Vinylferrocene, introducing its new discovery.

Synthesis, characterization and second-order nonlinear optical behaviour of ferrocene-diketopyrrolopyrrole dyads: The effect of alkene: Vs. alkyne linkers

New, thermally stable dipolar ferrocene-diketopyrrolopyrrole (Fc-DPP) dyads with alkene as a linker exhibited structure dependent first hyperpolarizabilities, betaHRS, recorded by a femtosecond HRS technique using a femtosecond (120 fs) pulsed laser light system at 900 nm at ambient temperature. On the basis of linear optical, electrochemical and TD-DFT studies, a good structure-polarization relationship has been established to account for the observed trends in first hyperpolarizabilities. The dyads exhibited fluctuating but matching solvatochromism. Nonlinear optical properties are modulated both by the strength of the acceptor as well as the length and nature of the pi-conjugation bridge. betaHRS of the dyads were compared with structurally related dyads in which the DPP core and the Fc donor are linked via an alkyne bridge. It is interesting to observe that the replacement of an alkyne link with alkene in these D-pi-A chromophores does not necessarily furnish enhanced betaHRS.

Synthesis, characterization and second-order nonlinear optical behaviour of ferrocene-diketopyrrolopyrrole dyads: The effect of alkene: Vs. alkyne linkers

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

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Reactions of a cationic geminal Zr+/P pair with small molecules

The metallocene cation complex [Cp*2ZrCH3] +[B(C6F5)4]- inserts the phosphino-substituted alkyne Ph-Ci – 1/4C-PPh2 into the [Zr]-CH3 bond to form the internally phosphane-stabilized cation [Cp*2Zr-C(=CMePh)PPh2]+ (10). Complex 10 adds alkyl isocyanides as well as pivalonitrile at a lateral site at the bent metallocene wedge with retention of the Zr-P bond. Complex 10 acts as a reactive frustrated Lewis pair toward heterocumulenes, undergoing Zr+/P addition reactions to the carbonyl groups of an alkyl isocyanate and of carbon dioxide to form the respective five-membered metallaheterocyclic adducts 13 and 14. With mesityl azide complex 10 undergoes a Zr+/P FLP N,N-addition reaction at the terminal azide nitrogen atom to form the four-membered FLP cycloadduct 15. The Zr+/P FLP is a reactive hydrogen activator. In a stoichiometric reaction it generates a hydridozirconocene cation that subsequently serves as a hydrogenation catalyst for various olefinic or acetylenic substrates. The Zr+/P pair 10 undergoes selective 1,4-addition reactions to conjugated enones and to a conjugated ynone to give the corresponding seven-membered metallacyclic Zr+/P FLP addition products. Many compounds of this study were characterized by X-ray diffraction.

Reactions of a cationic geminal Zr+/P pair with small molecules

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. category: iron-catalyst. Introducing a new discovery about 1271-51-8, Name is Vinylferrocene

Ferrocene Derivatives, Part 67 57Fe-NMR Spectroscopy of Ferrocenes

57Fe NMR-spectra of 28 mono and disubstituted ferrocenes with a natural abundance of 57Fe have been measured relative to internal ferrocene.Most of the resonances appear at the high frequency side.The shielding influence of the various substituents is discussed qualitatively. 57Fe shifts are very sensitive to ring tilting as occurring in <3>ferrocenophanes. – Keywords: 57Fe Shifts; Hybridization influence on chemical shifts; Ring tilting

Ferrocene Derivatives, Part 67 57Fe-NMR Spectroscopy of Ferrocenes

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, COA of Formula: C12H3Fe, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 1271-51-8, Name is Vinylferrocene, molecular formula is C12H3Fe

Asymmetric Iron-Catalyzed C?H Alkylation Enabled by Remote Ligand meta-Substitution

Highly enantioselective iron-catalyzed C?H alkylations by inner-sphere C?H activation were accomplished with ample scope. High levels of enantiocontrol proved viable through a novel ligand design that exploits a remote meta-substitution on N-heterocyclic carbenes within a facile ligand-to-ligand H-transfer C?H cleavage.

Asymmetric Iron-Catalyzed C?H Alkylation Enabled by Remote Ligand meta-Substitution

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Recommanded Product: Vinylferrocene. Introducing a new discovery about 1271-51-8, Name is Vinylferrocene

Enantioselective Construction of Silicon-Stereogenic Silanes by Scandium-Catalyzed Intermolecular Alkene Hydrosilylation

The catalytic asymmetric construction of silicon-stereogenic silanes is of great interest and significance, but has met with only limited success to date. We herein report the enantioselective hydrosilylation of alkenes with dihydrosilanes by a chiral half-sandwich scandium catalyst, which constitutes an efficient and general route for the synthesis of a wide range of enantioenriched silicon-stereogenic silanes from easily accessible starting materials. This reaction features a broad substrate scope, high yields, and high enantioselectivity. Some of the chiral tertiary silane products were also converted into valuable derivatives, such as chiral silanol, quaternary silane, and benzosilole compounds.

Enantioselective Construction of Silicon-Stereogenic Silanes by Scandium-Catalyzed Intermolecular Alkene Hydrosilylation

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Computed Properties of C12H3Fe, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 1271-51-8, Name is Vinylferrocene, molecular formula is C12H3Fe

Pentacarbonyl(eta2-vinylferrocene)metal(0) complexes of Group 6 elements: Synthesis and characterization

Photolysis of hexacarbonylmetal(0) complexes of the Group 6 elements in the presence of vinylferrocene in an n-hexane solution at -15 C yields pentacarbonyl (eta2-vinylferrocene)metal(0) complexes as the sole photo-substitution product, different from the general reaction pattern observed for the same Group 6 metal carbonyls with other olefins. M(CO)5(eta2-vinylferrocene) complexes (M=Cr, Mo, W) could be isolated from the solution and characterized by using spectroscopic techniques. The complexes were found to be not very stable and their stability increases in the order CrComputed Properties of C12H3Fe, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1271-51-8, in my other articles.

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Reference of 1271-51-8, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1271-51-8, Name is Vinylferrocene, molecular formula is C12H3Fe. In a Article£¬once mentioned of 1271-51-8

A Deprotonation Approach to the Unprecedented Amino-Trimethylenemethane Chemistry: Regio-, Diastereo-, and Enantioselective Synthesis of Complex Amino Cycles

The first realization of the amino-trimethylenemethane chemistry is reported using a deprotonation strategy to simplify the synthesis of the amino-trimethylenemethane donor in two steps from commercial and inexpensive materials. A broad scope of cycloaddition acceptors (seven different classes) participated in the chemistry, chemo-, regio-, diastereo-, and enantioselectively generating various types of highly valuable complex amino cycles. Multiple derivatization reactions that further elaborated the initial amino cycles were performed without isolation of the crude product. Ultimately, we applied the amino-trimethylenemethane chemistry to synthesize a potential pharmaceutical in 8 linear steps and 7.5 % overall yield, which previously was achieved in 18 linear steps and 0.6 % overall yield.

A Deprotonation Approach to the Unprecedented Amino-Trimethylenemethane Chemistry: Regio-, Diastereo-, and Enantioselective Synthesis of Complex Amino Cycles

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments. Formula: C12H3Fe. Introducing a new discovery about 1271-51-8, Name is Vinylferrocene

Synthesis and reactivity of cyclotriphosphazenes bearing reactive silane functionalities. Novel derivatives via hydrosilylation reactions

Cyclotriphosphazenes with the general structure N3P3(OPh)5NH(CH2)3SiMe2OEt react with lithium aluminum hydride in diethyl ether to produce N3P3(OPh)5NH(CH2)3SiMe2H. Subsequent reaction of this species with alkenes in the presence of a platinum catalyst produced new cyclotriphosphazenes bearing alkoxy, siloxy, glycidyl, and ferrocenyl side groups. The yields depended on the type of catalyst and olefin used. Tetramethyl-1,3-divinyldisiloxane-platinum complex (DVDS:Pt) was a more efficient hydrosilylation catalyst than hydrogen hexachloroplatinic acid (CPA). Use of the latter catalyst yielded the silanol N3P3(OPh)deltaNH(CH2)3SiMe2OH, as a side product. This derivative subsequently condensed to produce a ring-linked phosphazene species. The hydrosilylation products were studied by 31P, 1H, and 13C NMR and infrared spectroscopy, elemental analysis, and mass spectrometry. Analogous reactions were investigated with the high-polymeric counterparts. Polymers with the general structure [NPRL8(NH(CH2)3SiMe2OEt)0.2]n, where R is -OCH2CF3 or -OC6H5, were synthesized and allowed to react with LiAlH4. The reduction process induced significant molecular weight decline from phosphorus-nitrogen bond cleavage, which was probably initiated by coordination of the aluminum to the nitrogen atoms in the polymer backbone and the amino side group. The influence of complexing agents, such as 4-(dimethylamino)pyridine and Et3N, on the reduction reactions was investigated.

Synthesis and reactivity of cyclotriphosphazenes bearing reactive silane functionalities. Novel derivatives via hydrosilylation reactions

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion

 

Electric Literature of 1271-51-8, 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.1271-51-8, Name is Vinylferrocene, molecular formula is C12H3Fe. In a article£¬once mentioned of 1271-51-8

Benzothiadiazole-based organic dyes with pyridine anchors for dye-sensitized solar cells: Effect of donor on optical properties

Abstract New dyes containing pyridine anchoring group and different nitrogen-based heterocyclic electron-donating units linked via benzothiadiazole moiety have been synthesized and characterized by photophysical studies. Incorporation of benzothiadiazole extended the absorption onset into the lower energy region up to 600 nm. The dyes possessing vinyl linker between the heterocyclic donor and benzothiadiazole exhibited red-shifted absorption with high molar extinction coefficient than the dyes, which contain heterocyclic donor directly attached to the benzothiadiazole unit. The dyes exhibited acidochromism in the absorption spectra presumably due to the protonation of the pyridine nitrogen. These materials exhibited good thermal stability and their thermal-decomposition temperatures are in the range, 355-407 C. The dye-sensitized solar cells fabricated using a dye containing phenothiazine donor showed power conversion efficiency of 1.97%. Electrochemical impedance studies reveal that the charge separation is highly dependent on the structural composition of the dyes.

Benzothiadiazole-based organic dyes with pyridine anchors for dye-sensitized solar cells: Effect of donor on optical properties

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Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion