M.W=250-300 Archives - Page 45 of 46 - Bromides-buliding-blocks

Das, Tapaswini team published research on Tetrahedron Letters in 2022 | 90-59-5

Synthetic Route of 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

3,5-Dibromosalicylaldehyde, also known as 3,5-Dibromosalicylaldehyde, is a useful research compound. Its molecular formula is C7H4Br2O2 and its molecular weight is 279.91 g/mol. The purity is usually 95%.

3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes. 3,5-Dibromosalicylaldehyde can be used in the synthesis of Schiff base and can be used as reactant for synthesis of Schiff base ligands which forms mononuclear complexes with copper(II), nickel(II), zinc(II) and cobalt(II).

3,5-Dibromosalicylaldehyde is a copper complex that has been synthesized from 3,5-dibromosalicylaldehyde and copper chloride. FTIR spectroscopy revealed that the coordination geometry of the copper complex is octahedral with two nitrogen atoms in the equatorial plane. The presence of hydrogen bonding interactions was confirmed by homologous protein adsorption experiments. This chemical structure was determined using X-ray crystallography and fluorescence probe experiments. The copper complex showed high affinity for malonic acid, which is an ester hydrochloride. The molecular mechanism of this interaction is based on adsorption, which occurs through hydrogen bonding interactions and hydrophobic interactions. Structural analysis revealed that the polymeric matrix consists of a three-dimensional network of crosslinked chains, while FTIR analysis indicated a possible disulfide bond between two cysteine residues., 90-59-5.

Dehydrobromination, Grignard reactions, reductive coupling, Wittig reaction, and several nucleophilic substitution reactions are some of the principal reactions which involve organic bromides. 90-59-5, formula is C7H4Br2O2, Name is 3,5-Dibromo-2-hydroxybenzaldehyde. Organic compounds having carbon bonded to bromine are called organic bromides. Synthetic Route of 90-59-5.

Das, Tapaswini;Mohapatra, Seetaram;Priyadarsini Mishra, Nilima;Nayak, Sabita research published 《 Catalyst and base free aza-Michael addition reaction: Synthesis of poly-substituted 4-pyrazole based benzopyrans》, the research content is summarized as follows. An efficient and catalyst free protocol was disclosed for aza-Michael addition reaction of pyrazoles with 2-aryl-3-nitro-2H-chromene derivatives, which provided synthetically important 4-pyrazole-3-nitrobenzopyrans at room temperature In this one-pot transformation, good to excellent yield of the products up to 84% were obtained and generated a new C-N bond. The relative configuration of the product were characterized by a single crystal X-ray crystallog. This protocol was extensively applicable for the wide substrate scope, high yields, easy accessibility, as well as base and catalyst free condition.

Synthetic Route of 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Davis, Jacqkis team published research on Chemistry – A European Journal in 2022 | 90-59-5

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Davis, Jacqkis;Gharaee, Mojgan;Karunaratne, Chamini V.;Cortes Vazquez, Jose;Haynes, Mikayla;Luo, Weiwei;Nesterov, Vladimir N.;Cundari, Thomas;Wang, Hong research published 《 Asymmetric Synthesis of Chromans Through Bifunctional Enamine-Metal Lewis Acid Catalysis》, the research content is summarized as follows. Cooperative enamine-metal Lewis acid catalysis has emerged as a powerful tool to construct carbon-carbon and carbon-heteroatom bond forming reactions. A concise synthetic method for asym. synthesis of chromans from cyclohexanones and salicylaldehydes has been developed to afford tricyclic chromans containing three consecutive stereogenic centers in good yields (up to 87%) and stereoselectivity (up to 99% ee and 11 : 1 : 1 dr). This difficult organic transformation was achieved through bifunctional enamine-metal Lewis acid catalysis. It is believed that the strong activation of the salicylaldehydes through chelating to the metal Lewis acid and the bifunctional nature of the catalyst accounts for the high yields and enantioselectivity of the reaction. The absolute configurations of the chroman products were established through X-ray crystallog. DFT calculations were conducted to understand the mechanism and stereoselectivity of this reaction.

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Demidov, Maxim R. team published research on Journal of Organic Chemistry in 2021 | 90-59-5

Formula: C7H4Br2O2, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Organobromine compounds, also called organobromides, are organic compounds that contain carbon bonded to bromine. 90-59-5, formula is C7H4Br2O2, The most pervasive is the naturally produced bromomethane. Formula: C7H4Br2O2

Demidov, Maxim R.;Osyanin, Vitaly A.;Osipov, Dmitry V.;Klimochkin, Yuri N. research published 《 Three-Component Condensation of Pyridinium Ylides, β-Ketonitriles, and Aldehydes with Divergent Regioselectivity: Synthesis of 4,5-Dihydrofuran-3- and 2H-Pyran-5-carbonitriles》, the research content is summarized as follows. A library of trans-4,5-dihydrofuran-3-carbonitriles was synthesized in a diastereoselective manner in good yields by the three-component reaction of β-ketonitriles, carbonyl- and semistabilized pyridinium ylide precursors, and aldehydes in the presence of piperidine. This one-pot transformation generates two C-C and one C-O bond and proceeds through a cascade Knoevenagel condensation, a Michael addition, and intramol. S_N2 cyclization. Formation of cyclopropanecarbonitrile derivatives, which in some cases were obtained as major products, was found to be a competing reaction. The use of arylglyoxals changes regioselectivity and leads to 2-hydroxy-2H-pyran-5-carbonitriles.

Formula: C7H4Br2O2, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Damoc, Madalin team published research on Dalton Transactions in 2021 | 90-59-5

Computed Properties of 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Damoc, Madalin;Stoica, Alexandru-Constantin;Dascalu, Mihaela;Asandulesa, Mihai;Shova, Sergiu;Cazacu, Maria research published 《 Dual crystalline-amorphous salen-metal complexes behave like nematic droplets with AIEgens vistas》, the research content is summarized as follows. A series of metal salen complexes, original in view of the presence in their structure of a highly flexible and hydrophobic spacer, were prepared on the basis of the reaction of 1,3-bis(3-aminopropyl)tetramethyldisiloxane with 3,5-dichloro-, 3,5-dibromo- and 3-hydroxy-salicylaldehyde and various metal ions (Co²⁺, Ni²⁺, Cu²⁺ and Zn²⁺). The isolated products were completely characterized from the structural point of view by FTIR, NMR, elemental anal. and single crystal x-ray diffraction, and further studied from the perspective of the behavior induced mainly by the structural peculiarities. Emphasis is placed on self-assembly properties, both in bulk and in solution, depending on temperature, solvent nature and concentration, including thermotropic and lyotropic liquid crystals (LC). LCs that appear as nematic toroidal droplets were fully demonstrated by polarized optical microscopy (POM), DSC, broadband dielec. spectroscopy (BDS) and fluorescence anisotropy studies. The fluorescence anal. results revealed the aggregation-induced emission (AIE) phenomenon, where the emission occurs only for liquid crystals, with a few exceptions. Because these complexes can exist in both amorphous and crystalline states, it raised the question of how properties, such as elec., change when switching from one state to another. These were well highlighted by DSC, BDS, PXRD, FTIR and fluorescence anisotropy.

Computed Properties of 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chinnasamy, Ragaverthini team published research on Chemistry – A European Journal in 2022 | 90-59-5

Category: bromides-buliding-blocks, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. 90-59-5, formula is C7H4Br2O2, Name is 3,5-Dibromo-2-hydroxybenzaldehyde. Organobromine compounds have fallen under increased scrutiny for their environmental impact., Category: bromides-buliding-blocks.

Chinnasamy, Ragaverthini;Ravi, Jada;Vinay Pradeep, Vuppu;Manoharan, Deepak;Emmerling, Franziska;Bhattacharya, Biswajit;Ghosh, Soumyajit;Chandrasekar, Rajadurai research published 《 Adaptable Optical Microwaveguides From Mechanically Flexible Crystalline Materials》, the research content is summarized as follows. Flexible organic crystals (elastic and plastic) are important materials for optical waveguides, tunable optoelectronic devices, and photonic integrated circuits. Highly elastic organic crystals of a Schiff base, 1-((E)(2,5-dichlorophenylimino)Me)naphthalen-2-ol (1), and an azine mol., 2,4-dibromo-6-((E)((E)(2,6-dichlorobenzylidene)hydrazono)Me)phenol (2) are presented. These microcrystals are highly flexible under external mech. force, both in the macroscopic and the microscopic regimes. The mech. flexibility of these crystals arises of weak and dispersive C-H···Cl, Cl···Cl, Br···Br, and π···π stacking interactions. Singly and doubly-bent geometries were achieved from their straight shape by a micromech. approach using the AFM cantilever tip. Crystals of mols. 1 and 2 display a bright-green and red fluorescence (FL), resp., and selective reabsorption of a part of their FL band. Crystals 1 and 2 exhibit optical-path-dependent low loss emissions at the termini of crystal in their straight and even in extremely bent geometries. The excitation position-dependent optical modes appear in both linear and bent waveguides of crystals 1 and 2, confirming their light-trapping ability.

Category: bromides-buliding-blocks, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chinnasamy, Ragaverthini team published research on Crystal Growth & Design in 2022 | 90-59-5

SDS of cas: 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Chinnasamy, Ragaverthini;Munjal, Bhushan;Suryanarayanan, Raj;Peedikakkal, Abdul Malik P.;Mishra, Manish Kumar;Ghosh, Soumyajit research published 《 Pressure and Temperature Induced Dual Responsive Molecular Crystals: Effect of Polymorphism》, the research content is summarized as follows. Dimorphic forms (1a and 1b) of 2-hydroxy-3,5-dibromobenzylidine-4-fluoro-3-nitroaniline (Crystal 1) where form 1a is brittle and form 1b is elastically bendable are reported. Both polymorphs exhibit progressive thermosalient responses which are seemingly different. One polymorph (1a) shows jumping, while the other (1b) shows bending. The property difference is solely attributed to the inherent crystal packing and linked to the differences in the mol. conformations, structural packing, and intermol. interactions. 2-Hydroxy-3-bromo-5-chlorobenzylidine-4-fluoro-3-nitroaniline (Crystal 2) was nonthermosalient but was mech. flexible. Variable temperature powder x-ray diffractometry revealed anisotropic crystallog. face expansion-a possible explanation for the different thermosalient behaviors of the dimorphs.

SDS of cas: 90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Cocco, Andrea team published research on ACS Omega in 2021 | 90-59-5

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Organic compounds having carbon bonded to bromine are called organic bromides. 90-59-5, formula is C7H4Br2O2, Name is 3,5-Dibromo-2-hydroxybenzaldehyde. Depending on the type of carbon to which the bromine is bonded, organic bromide could be alkyl, alkenyl, alkynyl, or aryl. COA of Formula: C7H4Br2O2.

Cocco, Andrea;Caria, Paola;Sanna, Giuseppina;Stagi, Luigi;Cadoni, Enzo;Corpino, Riccardo;Ricci, Pier Carlo;Carbonaro, Carlo Maria;Secci, Francesco research published 《 Synthesis and Photophysical Properties of Fluorescent 6-Aryl-D-π-A Coumarin Derivatives》, the research content is summarized as follows. A series of 6-aryl coumarin dyes were synthesized in satisfactory yields by Pd-catalyzed Suzuki cross-coupling reactions with a panel of boronic acids and coumarin bromides. Photophys. studies highlighted a large Stoke shift and interesting fluorescence quantum yield for these compounds Optical properties were also investigated with the aid of quantum chem. calculations The treatment of selected coumarin dyes with increasing amounts of trifluoroacetic acid showed that their fluorescence can be strongly influenced by pH (fluorescence quenching at high acid concentrations), while the addition of Fe³⁺ and Al³⁺ metal ions allowed to highlight dichotomous behavior with the corresponding reduction in fluorescence with the increase of [Fe³⁺] or [Al³⁺]. Finally, biol. assays and fluorescence microscopy imaging investigations indicated that these compounds can be used as potential biomarkers in living and fixed cells.

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chen, Yue team published research on Dalton Transactions in 2021 | 90-59-5

Application of C7H4Br2O2, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Chen, Yue;Yang, Qi;Peng, Guo;Zhang, Yi-Quan;Ren, Xiao-Ming research published 《 Influence of F-position and solvent on coordination geometry and single ion magnet behavior of Co(II) complexes》, the research content is summarized as follows. Three mononuclear Co(II) complexes with the compositions of [Co(L₁)₂] (1), [Co(L₂)₂(MeCN)] (2) and [Co(L₃)₂] (3) (HL₁ = 2-((E)-(2-fluorobenzylimino)methyl)-4,6-dibromophenol, HL₂ = 2-((E)-(3-fluorobenzylimino)methyl)-4,6-dibromophenol and HL₃ = 2-((E)-(4-fluorobenzylimino)methyl)-4,6-dibromophenol) were prepared and structurally determined The changes in the F-positions in the ligands and solvents gave these products with various coordination geometries. Both complexes 1 and 3 are four-coordinated and their coordination geometries can be described as tetrahedron and seesaw, whereas complex 2 is five coordinated with a coordination configuration in between trigonal bipyramid and square pyramid. Static magnetic studies reveal that all these complexes exhibit considerable easy-axis magnetic anisotropy. The easy-axis magnetic anisotropy of 1 and 3 mainly derives from the first quartet excited state, whereas that of 2 primarily originates from the first, third and fourth quartet excited states established by theor. calculations All the resulting complexes display field-induced slow magnetic relaxation. Complex 3 represents the first Co(II) single ion magnet with a seesaw coordination geometry. Ab initio calculations predict that the magnetic anisotropy will enhance when the seesaw coordination geometry varies from distortion to regulation.

Application of C7H4Br2O2, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chen, Yu-Xuan team published research on Research on Chemical Intermediates in 2022 | 90-59-5

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Vinyl bromides undergo the Heck reaction, which involves C-C coupling with alkene to give substituted alkenes. 90-59-5, formula is C7H4Br2O2, Name is 3,5-Dibromo-2-hydroxybenzaldehyde. Methyl bromide is a precursor in the manufacture of several chemicals and is employed as a soil sterilant, mainly for seed production. Safety of 3,5-Dibromo-2-hydroxybenzaldehyde.

Chen, Yu-Xuan;Di, Jia-Qi;Geng, Shan-Shan;Zhang, Zhan-Hui research published 《 Application of potassium-modified carbon nitride as a highly efficient recyclable catalyst for synthesis of 4H-chromene derivatives》, the research content is summarized as follows. A potassium-doped carbon nitride (K-CN) was prepared by a simple thermal polymerization method. The prepared K-CN was characterized by Fourier IR spectroscopy (FT-IR), powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and XPS techniques. The obtained K-CN exhibited excellent catalytic activity for synthesis of 4H-chromene derivatives via one-pot three-component reaction of salicylaldehyde, cyclohexane-1,3-diones and 4-hydroxycoumarin in water/ethyl lactate at room temperature The reported method shows significant advantages, such as high yield, mild and clean reaction conditions, the use of recyclable catalyst and Et lactate/water as an environmentally friendly solvent, multi-component reaction at room temperature, no chromatog. separation and suitable for large-scale synthesis.

90-59-5, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chen, Chien-Tien team published research on ACS Catalysis in 2021 | 90-59-5

Recommanded Product: 3,5-Dibromo-2-hydroxybenzaldehyde, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Chen, Chien-Tien;Su, Yu-Cheng;Lu, Chia-Hao;Lien, Chien-I.;Hung, Shiang-Fu;Hsu, Chan-Wei;Agarwal, Rachit;Modala, Ramuasagar;Tseng, Hung-Min;Tseng, Pin-Xuan;Fujii, Ryoma;Kawashima, Kyohei;Mori, Seiji research published 《 Enantioselective Radical Type, 1,2-Oxytrifluoromethylation of Olefins Catalyzed by Chiral Vanadyl Complexes: Importance of Noncovalent Interactions》, the research content is summarized as follows. Asym. three-component 1,2-oxytrifluoromethylations of styrenes were explored by using N-oxyphthalimide (NOPI) as the resulting benzylic radical anchor after cross-coupling by a CF₃ radical under the catalyzes of chiral N-salicylidene-derived oxovanadium(V) complexes. Among the 15 different solvents and 15 different catalysts examined, the best scenarios were in i-PrOH with C3-tert-Bu or C3-fluoro-/2,5-dimethylphenyl-substituted vanadyl catalysts that led to the corresponding complementary S and R products in up to 88% yields and 87/86% ees, resp., with further enrichment to at least 94% ee after a single recrystallization The control α-(2-phenylcyclopropyl)styrene was tested to prove the asym. event involving the benzylic radical species. DFT computations showed that the SOMO of the benzylic radical is placed in a way to orient the CF₃CH₂ group away from the tert-Bu group in the salicylidene-L-tert-butylglycinate template by interacting with the N-oxygen atom of NOPI bound to the vanadium center with a bimol. homolytic substitution (S_H2) type mechanism. The enantioselectivity profile was dominated by several noncovalent interactions between the intermediary vanadium(NOPI) complex and the resulting benzylic radical.

Recommanded Product: 3,5-Dibromo-2-hydroxybenzaldehyde, 3,5-Dibromosalicylaldehyde reacts with alkyl cyanoacetates in the presence of ammonium acetate to yield 4H- chromenes.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary