Category: 49669-22-9

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The new tin reagents, 2-(n-Bu3Sn)-6-{C(R)OCH2CH 2O}-C5H3N, (R=H a, Me b), have been employed in Stille-type cross-coupling reactions with a range of oligopyridylbromides generating, following a facile deprotection step, a series of formyl- and acetyl-functionalised oligopyridines. Condensation reactions with 2,6-diisopropylaniline has allowed access to families of novel sterically bulky multidentate N,N,N,N (tetradentate), N,N,N,N,N (pentadentate), N,N,N,N,N,N (sexidentate) and N,N,N,N,N,N,N (heptadentate) nitrogen donor ligands. This work represents a straightforward and rapid synthetic route for the preparation of oligopyridylimines, which are expected to act as useful components for the self-assembly of polymetallic complexes.

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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: 49669-22-9, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Patent, authors is ，once mentioned of 49669-22-9

PROBLEM TO BE SOLVED: high function, and in reducing the amount of the olefin, especially excellent in large quantity and the second quantity (preferably two trimerizing) can be used as the catalyst for a new transition metal compound and, olefin containing a large amount of catalyst. SOLUTION: for example sill conium coordination compound represented by the following eq. (A). Selected drawing: no (by machine translation)

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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, Formula: C10H6Br2N2, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Article, authors is El-Ghayoury，once mentioned of 49669-22-9

Facile synthesis of polypyridine esters: A route to functionalized aldehydes

A wide range of ester-substituted oligopyridines, based on pyridine, 1,8-naphthyridine, 1,10-phenanthroline, 2,2′-bipyridine, and 2,2′:6′,6-terpyridine units, has been synthesized and fully characterized. The principal reaction involves the palladium(0)-catalyzed carboalkoxylation of the bromo-, chloro- or triflate-substituted pyridine unit with carbon monoxide in the presence of a primary alcohol as nucleophile and a tertiary amine as base. Monofunctionalization of disubstituted compounds is realized by reaction in ethanol under mild conditions (70 C, 1 atm CO). Stepwise reduction of selected esters with sodium borohydride, followed by Swern oxidation, affords the corresponding carbaldehydes in good yield. Several products are reported for the first time. The synthetic methods reported herein represent a valuable approach to the large-scale preparation of ester-functionalized oligopyridines that can be subsequently transformed to the corresponding alcohols or acids. These procedures also provide a practical methodology to the rational design of ligands bearing different kinds of functionalities.

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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, Safety of 6,6′-Dibromo-2,2′-bipyridine, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Article, authors is Haberhauer, Gebhard，once mentioned of 49669-22-9

Control of planar chirality: The construction of a copper-ion-controlled chiral molecular hinge

(Figure Presented) An open-and-closed case: When a chiral clamp is attached to a molecular hinge the open-close motion induced by coordination to a metal ion becomes unidirectional (see scheme). The large change in amplitude caused by the unidirectional rotation and the relatively simple preparation of the hinge open up the possibility of using this concept for even more-complex molecular machines.

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

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 49669-22-9, molcular formula is C10H6Br2N2, introducing its new discovery. SDS of cas: 49669-22-9

Synthesis of bis(pyrrol-2-yl)arenes by Pd-catalyzed cross coupling

2-Borylpyrrole was prepared from 2-iodopyrrole almost quantitatively and then reacted with dihaloarenes under typical reaction conditions of Suzuki-Miyaura cross coupling to give bis(pyrrol-2-yl)arenes in good yields, while the cross coupling reaction of 2-iodopyrrole with 1,4-phenylenebisboronic acid was susceptible to oxidative self-coupling to produce 4,4?-bis(pyrrol-2-yl)biphenyl as a byproduct. These bis(pyrrol-2-yl)arenes showed strong fluorescence.

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

Electric Literature of 49669-22-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Patent£¬once mentioned of 49669-22-9

COMPOUNDS HAVING BIPYRIDYL GROUP AND CARBAZOLE RING, AND ORGANIC ELECTROLUMINESCENT ELEMENT

The present invention relates to a compound having a bipyridyl group and a carbazole ring, which is represented by the following general formula (1); and an organic electroluminescent element containing a pair of electrodes and at least one organic layer interposed therebetween, in which the compound is used as a constituent material of the at least one organic layer:

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Reference£º
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, Product Details of 49669-22-9, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Article, authors is Weber, Edwin£¬once mentioned of 49669-22-9

Solid-State Inclusion Compounds of New Host Macrocycles with Uncharged Organic Molecules. Host Synthesis, Inclusion Properties, and X-ray Crystal Structure of an Inclusion Compound with 1-Propanol

A series of organic macrocycles composed of a systematically varied combination of ethano, propano, benzeno, pyridino,and analogous groups, mainly ether-linked (see Chart I), are reported, and their abilities to function as solid-state inclusion hosts are studied.It is found that 3-5, 11-13, 18b, and 21 form crystalline inclusion compounds with a number of low-molecular-weight alcohols such as methanol, ethanol, 1- and 2-propanol, 1-butanol, ethylene glycol, and/or with dimethylformamide and acetonitrile as CH-acidic guests.The observed inclusion selectivities and thestoichiometries of the various host-guest compounds are discussed showing that by and large both chemical and steric host-guest fits apply in the formation of the aggregates.The crystal structure of the inclusion compound of the bipyridino host 11 with 1-propanol (1:1) has been determined from single-crystal X-ray diffraction.There are eight host and guest molecules in each unit cell of dimension a = 2665.2 pm, b = 813.8 pm, c = 2667.4 pm, beta = 105.61 deg; space group C2/c; R = 0.088 for 2884 unique reflections.The host macrocycle shows a hollow-type conformation with the 1-propanol molecule coordinated via a moderately stable H-bond to one of the bipyridine nitrogens (O…N = 300 pm).The packing diagram characterizes the host-guest topology largely as a channel-like clathrate (actually “tubulato-coordinatoclathrate”).A number of general conclusions that will facilitate the future design of selectively binding hosts for solid-state inclusion are given.

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

Electric Literature of 49669-22-9, 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.49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a article£¬once mentioned of 49669-22-9

Concentration-dependent chemo- and regioselective metalation of 6,6?-dibromo-2,2?-bipyridine

A reliable and synthetically useful strategy for the selective single or double metalation of 6,6?-dibromo-2,2?-bipyridine via lithium-halogen exchange is discussed. Experimental conditions for the optimal formylation of the singly and doubly lithiated intermediates are outlined as well as unequivocal X-ray crystallographic evidence for the regiochemistry of a competing deprotonation pathway. Georg Thieme Verlag Stuttgart.

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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£¬ Application In Synthesis of 6,6′-Dibromo-2,2′-bipyridine, Which mentioned a new discovery about 49669-22-9

TUNABLE PHENYLACETYLENE HOSTS

A compound, or a salt thereof, having the formula wherein Y is n is 1 or 2; each R is independently H, alkyl, substituted alkyl, a polyether moiety, carboxyl, substituted carboxyl, carbamate, substituted carbonate, carbonyloxy, alkoxy, substituted alkoxy, haloalkyl, halogen, nitro, amino, aryloxy, cyano, hydroxyl, or sulfonyl; R1 is H, lower alkyl or aralkyl; R2 is selected from H, acyl, aralkyl, phosphonyl, ?SO2R3; ?C(O)R5; ?C(O)OR7 or ?C(O)NR9R10; R3; R5; R7; R9 and R10 independently are selected from H, lower alkyl, aralkyl or aryl; and R20 is selected from alkyl, substituted alkyl, a polyether moiety, carboxyl, substituted carboxyl, carbamate, substituted carbonate, carbonyloxy, alkoxy, substituted alkoxy, haloalkyl, halogen, nitro, amino, aryloxy, cyano, hydroxyl, or sulfonyl.

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

Related Products of 49669-22-9, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 49669-22-9, Name is 6,6′-Dibromo-2,2′-bipyridine, molecular formula is C10H6Br2N2. In a Article£¬once mentioned of 49669-22-9

Comparison of the catalytic activity of [(eta5-C 5H5)Ru(2,2?-bipyridine)(L)]OTf versus [(eta5-C5H5)Ru(6,6?-diamino-2,2?- bipyridine)(L)]OTf (L = labile ligand) in the hydrogenation of cyclohexanone. Evidence for the presence of a metal-ligand bifunctional mechanism under acidic conditions

The two title complexes as well as the dimeric complex [Ru(II) (eta5-C5H5)(6,6?-diamino-2,2?- bipyridine)]2(OTf)2 have been synthesized and characterized by NMR and single-crystal X-ray crystallography. The direct structural comparison of the 2,2?-bipyridine and 6,6?-diamino-2, 2?-bipyridine complexes suggests that the electronic and steric environments of the ruthenium centers in both complexes are essentially equivalent, providing for a unique opportunity to probe the influence of the noncoordinated amine substituent on the relative reactivity and catalytic activity of the complexes. Opposite to what would be anticipated on the basis of steric effects, the bulkier amine-substituted ligand results in a catalyst showing substantially higher activity in the hydrogenation of cyclohexanone in acidic medium, which is attributed to the operation of a metal-ligand bifunctional hydrogenation mechanism mediated by the amine substituents in their protonated form acting as proton shuttles.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Related Products of 49669-22-9, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 49669-22-9, in my other articles.

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