Tag: M.W=300-400

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called N-Heterocyclic Carbene-Catalysed Mukaiyama-Michael Reaction and Mukaiyama Aldol/Mukaiyama-Michael Three-Component Coupling Reaction*, published in 2017, which mentions a compound: 286014-53-7, mainly applied to carbene catalyzed Mukaiyama Michael reaction silyl enol ether chalcone; three component coupling carbene catalyzed silyl enol ether chalcone, Safety of 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate.

An N-heterocyclic carbene-catalyzed Mukaiyama-Michael addition between several trimethylsilyl (TMS) enol ethers and chalcone derivatives was discovered. A related reaction cascade involving dehydrative Mukaiyama aldol followed by a Mukaiyama-Michael addition process was developed. The later reaction can also be achieved as a three-component coupling reaction. The enantioselective variant of these reactions was examined with homochiral catalysts. Though these catalysts were active, they fail to achieve enantioinduction.

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Bromide – Wikipedia,
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Application of 286014-53-7. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Looking for a Synergic Effect between NHCs and Chiral P-Ligands. Author is Toselli, Nicolas; Martin, David; Buono, Gerard.

The issue of the added value of NHCs in asym. catalysis with respect to trusted chiral P-ligands was addressed: considering a prototypical asym. allylic alkylation reaction as a model, the association of a priori inhibiting and achiral NHCs with modular P-ligand resulted in enhancement of er up to 508% and increased rates.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Stabilisation of gold nanoparticles by N-heterocyclic thiones》. Authors are Moraes, Leonardo C.; Lacroix, Bertrand; Figueiredo, Rute C.; Lara, Patricia; Rojo, Javier; Conejero, Salvador.The article about the compound:1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroboratecas:286014-53-7,SMILESS:CC1=C([N+]2=CN(C3=C(C)C=C(C)C=C3C)C=C2)C(C)=CC(C)=C1.F[B-](F)(F)F).Safety of 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate. Through the article, more information about this compound (cas:286014-53-7) is conveyed.

Gold nanoparticles (Au-NPs) have been prepared using N-heterocyclic thiones (NHTs) as ligand stabilizers. These Au-NPs were very stable, even in air, and were characterized by a combination of several techniques (TEM, HR-TEM, STEM-HAADF, EDX, DLS, elemental anal. and 1H NMR). These nanoparticles are active in the catalytic reduction of nitroarenestoanilines.

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Bromide – Wikipedia,
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Application In Synthesis of 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Synthesis of AuI- and AuIII-Bis(NHC) Complexes: Ligand Influence on Oxidative Addition to AuI Species. Author is Collado, Alba; Bohnenberger, Jan; Oliva-Madrid, Maria-Jose; Nun, Pierrick; Cordes, David B.; Slawin, Alexandra M. Z.; Nolan, Steven P..

The oxidation chem. of a range of AuI-bis(NHC) (NHC = N-heterocyclic carbene) complexes with hypervalent iodine(III) oxidants has been explored. AuI-bis(NHC) precursors have been synthesized by treatment of the corresponding [Au(NHC)Cl] derivatives with imidazol(idin)ium salts in the presence of K2CO3. The reactivity of the AuI complexes towards PhICl2 has revealed an influence of the nature of the NHC ligands present in the complex on the outcome of the oxidation reaction: small and more strongly electron-donating NHC ligands favored the formation of a AuIII species. On the basis of these results, a AuI complex bearing two 1-butyl-3-methylimidazol-2-ylidene (BMIM) ligands has been synthesized. This complex reacted with PhICl2 and also – for the first time in Au-NHC systems – with PhI(OAc)2 and PhI(OAcF)2 (OAcF = trifluoroacetate), affording stable AuIII-(NHC)2 complexes bearing acetate ligands.

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Name: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Expeditious synthesis of [Au(NHC)(L)]+ (NHC = N-heterocyclic carbene; L = phosphine or NHC) complexes. Author is Gaillard, Sylvain; Nun, Pierrick; Slawin, Alexandra M. Z.; Nolan, Steven P..

Deprotonation of imidazolium or tertiary phosphonium salts by the versatile N-heterocyclic carbene (NHC) gold(I) hydroxide [Au(OH)(IPr)] (IPr = N,N’-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) as precursor permits the expedient synthesis of a series of cationic heteroleptic [Au(NHC)(NHC’)]+ and [Au(NHC)(PR3)]+ complexes. Complete characterization by 1H and 13C NMR spectroscopy and by single-crystal x-ray diffraction was performed in order to discern electronic and structural differences between cationic heteroleptic [Au(NHC)(NHC’)]+ and [Au(NHC)(PR3)]+ congeners.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Copper-Catalyzed Direct Aryl Quaternization of N-Substituted Imidazoles to Form Imidazolium Salts, the main research direction is copper catalyzed quaternization imidazole aryliodonium salt; imidazolium salt preparation; triazolium salt preparation.Application of 286014-53-7.

Diaryliodonium salts are employed to directly quaternize N-substituted imidazoles by using a copper catalyst to construct aryl imidazolium salts in moderate to excellent yields [e.g., N-phenylimidazole + diphenyliodonium tetrafluoroborate in presence of Cu(OAc)2 in DMF afforded 97% 1,3-diphenylimidazolium tetrafluoroborate]. This transformation is tolerant to a broad range of functional groups and provides a straightforward, efficient, and versatile route to synthesize aryl imidazolium as well as triazolium salts, especially the unsym. version.

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Bromide – Wikipedia,
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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate( cas:286014-53-7 ) is researched.Related Products of 286014-53-7.Zhang, Liang; Wu, Jie published the article 《Rhodium/N-heterocyclic carbene-catalyzed cross-couplings of aryl arenesulfonates with arylboronic acids》 about this compound( cas:286014-53-7 ) in Advanced Synthesis & Catalysis. Keywords: coupling reaction rhodium imidazole carbene catalyst phenylboronic acid benzenesulfonate. Let’s learn more about this compound (cas:286014-53-7).

A method for the synthesis of biaryl compounds is reported here. A combination of rhodium(I) and N-heterocyclic carbenes (NHC) was found to be effective as a catalyst for cross-coupling reactions of aryl arenesulfonates with arylboronic acids, which gave rise to the desired biaryl compounds in good yields.

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Bromide – Wikipedia,
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Quality Control of 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Probing the Diastereoselectivity of Staudinger Reactions Catalyzed by N-Heterocyclic Carbenes.

The reaction of ethylphenylketene with 1,3-dimesitylimidazol-2-ylidene (IMes) or 1,3-dimesitylimidazolin-2-ylidene (SIMes) afforded the corresponding azolium enolates in high yields. The two zwitterions were fully characterized by various anal. techniques. Their thermal stabilities were monitored by thermogravimetric anal. and the mol. structure of SIMes·EtPhC=C=O was determined by means of X-ray crystallog. A mechanism was proposed to account for the trans-diastereoselectivity observed in the [2+2] cycloaddition of ketenes and N-protected imines catalyzed by N-heterocyclic carbenes and an extensive catalytic screening was performed to test its validity. The steric bulk of the NHC catalyst markedly affected the cis/trans ratio of the model β-lactam product. The nature of the solvent used to carry out the Staudinger reaction also significantly influenced its diastereoselectivity. Conversely, the nature of the substituent on the N-sulfonated imine reagent and the reaction temperature were less critical parameters.

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Bromide – Wikipedia,
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Quality Control of 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate. 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: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Targeted and Systematic Approach to the Study of pKa Values of Imidazolium Salts in Dimethyl Sulfoxide. Author is Dunn, Michelle H.; Konstandaras, Nicholas; Cole, Marcus L.; Harper, Jason B..

A range of more than 25 imidazolium salts, chosen for their differing steric and electronic features, were prepared, and their pKa values were determined using the bracketing indicator method. Through the systematic change in the structure of the imidazolium cation, the effect of varying substituents at each position on the heterocyclic ring was determined; particularly, the transmission of electronic effects was quantified using Hammett parameters. These new data give an indication of the strength of base required for deprotonation and the potential to correlate these data with the nucleophilicity of the corresponding carbenes.

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Bromide – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1,3-Dimesityl-1H-imidazol-3-ium tetrafluoroborate, is researched, Molecular C21H25BF4N2, CAS is 286014-53-7, about Access to Fluorescent Azines from N-Heterocyclic Carbene Precursors and N-Tosylhydrazones, the main research direction is triazolopyridine arylidenehydrazono preparation fluorescence rotamerism; imidazole benzimidazole pyrrolotriazole arylidenehydrazono preparation; triazolopyridinium imidazolium benzimidazolium tetrafluoroborate coupling tosyl hydrazone.Category: bromides-buliding-blocks.

An efficient synthesis of azines from the reaction of N-heterocyclic carbene precursors, e.g. I (R1 = Me, Et, Ph), with N-tosylhydrazones R2R3C:NNHTs (R2 = Ph, 4-MeOC6H4, 3-BrC6H4, 1-naphthyl, 2-thienyl, PhCH:CH, etc., R3 = H; R2 = R3 = Ph, 3-F3CC6H4; R2 = Ph, R3 = Me; etc.) has been developed. This method avoids the direct use of diazo compounds and allows the synthesis of structurally diverse azines, e.g. II. The azine II (R1 = R2 = Ph) was further found to exhibit strong yellow fluorescence and showed promise as a reagent for biol. imaging.

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