Category: bromides-buliding-blocks

Quality Control of 3-Bromo-4-(trifluoromethoxy)benzaldehydeOn October 4, 2018 ,《Synthesis of vinyl and electron-deficient aryl trifluoromethyl sulfides via Csp2-OH bond activation with AgSCF3 and n-Bu4NI/KI》 was published in Tetrahedron. The article was written by Liu, Yin-Li; Xu, Xiu-Hua; Qing, Feng-Ling. The article contains the following contents:

Direct dehydroxytrifluoromethylthiolation of enols and electron-deficient phenols with AgSCF3 in the presence of Bu4NI and KI is reported, affording a series of vinyl and aryl trifluoromethyl sulfides in moderate to excellent yields. This work represents a rare example of direct functionalization of Csp2-OH bonds.3-Bromo-4-(trifluoromethoxy)benzaldehyde(cas: 85366-66-1Quality Control of 3-Bromo-4-(trifluoromethoxy)benzaldehyde) was used in this study.

3-Bromo-4-(trifluoromethoxy)benzaldehyde(cas: 85366-66-1) belongs to organobromine compounds.The reactivity of organobromine compounds resembles but is intermediate between the reactivity of organochlorine and organoiodine compounds. Dehydrobromination, Grignard reactions, reductive coupling, Wittig reaction, and several nucleophilic substitution reactions are some of the principal reactions which involve organic bromides.Quality Control of 3-Bromo-4-(trifluoromethoxy)benzaldehyde

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2016,Haruna, Kabiru; Alenaizan, Asem A.; Al-Saadi, Abdulaziz A. published 《Density functional theory study of the substituent effect on the structure, conformation and vibrational spectra in halosubstituted anilines》.RSC Advances published the findings.Name: 3,5-Dibromoaniline The information in the text is summarized as follows:

A comparative d. functional theory (DFT) study exploring the structural and spectroscopic properties of the complete set of halosubstituted anilines with the halogens being F, Cl and Br was carried out. This study aims at understanding the effect of the type, number and positions of halogen substituents on the inversion barrier, geometrical properties and vibrational frequencies. The compounds were exclusively predicted to exist in the near-planar pyramidal form. While the order of stability is noted to be independent of the type of halogen substituents, the size of the inversion barrier is predicted to be sensitive to their number and positions, in accordance with former theor. and exptl. reports. The higher number of halogens leads to a more pronounced planarity character of the amino group. The deactivating nature of halogen atoms is believed to enhance the lone-pair electron delocalization in the order of bromo- > chloro- > fluoroanilines. An unusually strong electron delocalization nature is predicted to exist in the case of tetra- and penta-substituted haloanilines. The results came from multiple reactions, including the reaction of 3,5-Dibromoaniline(cas: 626-40-4Name: 3,5-Dibromoaniline)

3,5-Dibromoaniline(cas: 626-40-4) belongs to anime. Large quantities of aliphatic amines are made synthetically. The most widely used industrial method is the reaction of alcohols with ammonia at a high temperature, catalyzed by metals or metal oxide catalysts (e.g., nickel or copper). Mixtures of primary, secondary, and tertiary amines are thereby produced.Name: 3,5-Dibromoaniline

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Fei; Kon, Allan B.; Rauh, R. David published an article in Macromolecules. The title of the article was 《Synthesis of a Terminally Functionalized Bromothiophene Polyphenylene Dendrimer by a Divergent Method》.Formula: C24H12Br6 The author mentioned the following in the article:

A polyphenylene dendrimer terminally functionalized with bromothiophene was prepared by a stepwise divergent approach using the palladium-catalyzed coupling reaction of aryl-zinc chloride and aryl bromide. The reaction yields were high, and the purification procedure for products were simple. This synthetic method can be extended further to the higher generations of dendrimer synthesis. In the experiment, the researchers used many compounds, for example, 3,3”,5,5”-Tetrabromo-5′-(3,5-dibromophenyl)-1,1′:3′,1”-terphenyl(cas: 29102-67-8Formula: C24H12Br6)

3,3”,5,5”-Tetrabromo-5′-(3,5-dibromophenyl)-1,1′:3′,1”-terphenyl(cas: 29102-67-8) belongs to organobromine compounds.Most of the natural organobromine compounds are produced by marine organisms , and several brominated metabolites with antibacterial , antitumor , antiviral , and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. Formula: C24H12Br6 Moreover, several studies demonstrate that the average proportion of bromine in drugs is significantly higher than that in natural products.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Computed Properties of C6H5BrO2On March 27, 2019, McRae, Callum; Kapoor, Anshul; Kanda, Pushpinder; Hibbert, Benjamin; Davis, Darryl R published an article in Heart rhythm. The article was 《Systematic review of biological therapies for atrial fibrillation.》. The article mentions the following:

Biological therapies that increase or suppress the expression of transcripts underlying atrial fibrillation (AF) progression are increasingly being explored to create novel treatment paradigms beyond simply suppressing or destroying tissue. To date, there has been no systematic overview of the preclinical evidence exploring manipulation of fundamental biological principles in the treatment of AF. As such, the objective of this study was to establish the effect of biological approaches used in the treatment of AF within large and small animals. We performed a systematic search using predefined terms, which yielded 25 studies. We determined the effect of biological approaches on primary efficacy outcomes and assessed the quality of included studies or possible bias in the treatment of AF. Compared with non-transduced or transduced controls, biological therapies reduced AF inducibility (85% less AF; odds ratio 0.15; 95% confidence interval [CI] 0.07-0.35; P < .01) and atrial scar burden (6.7% smaller scars; 95% CI 4.2-9.2; P < .01) or increased number of days in sinus rhythm (6.4 more days in sinus rhythm; 95% CI 5.83-6.97; P < .01). Similar effects were seen in both large and small animals, while a minor tendency to higher risk of bias was observed in small animal studies. In conclusion, treatment with any biological therapy significantly improved AF in preclinical animal models compared with controls. Although biological therapies target markedly different fundamental mechanisms, we observed a consistent difference in their effect on AF outcomes. The results came from multiple reactions, including the reaction of 2-Bromobenzene-1,4-diol(cas: 583-69-7Computed Properties of C6H5BrO2)

2-Bromobenzene-1,4-diol(cas: 583-69-7) belongs to organobromine compounds.Depending on the type of carbon to which the bromine is bonded, organic bromide could be alkyl, alkenyl, alkynyl, or aryl. Computed Properties of C6H5BrO2 Alkyl bromides are mainly used as alkylating agents and also find application as a solvent to extract oil from seeds and wool.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

COA of Formula: C4H6BrFO2On June 7, 2019, Wan, Yimei; Shang, Tianbo; Lu, Zenghui; Zhu, Gangguo published an article in Organic Letters. The article was 《Photocatalytic 1,1-Hydrofluoroalkylation of Alkynes with a Concurrent Vicinal Acylation: An Access to Fluoroalkylated Cyclic Ketones》. The article mentions the following:

A visible-light-induced 1,1-hydrofluoroalkylation of alkynes with a concomitant vicinal acylation is developed using THF (THF) as the hydrogen atom source. Various fluoroalkylated cyclic ketones, such as indanones, chroman-4-ones, 2,3-dihydroquinolin-4(1H)-ones, and 3,4-dihydronaphthalen-1(2H)-ones, can be efficiently synthesized with excellent trans-diastereoselectivity. The reaction represents the first example of 1,1-hydrofluoroalkylation of alkynes, thus providing a novel method for the construction of fluoroalkanes. In the experiment, the researchers used many compounds, for example, Ethylbromofluoroacetate(cas: 401-55-8COA of Formula: C4H6BrFO2)

Ethylbromofluoroacetate(cas: 401-55-8) is a member of organofluorine compounds. Organofluorine compounds, which have carbon-fluorine bonds, show unique features such as high thermal and chemical stability, high surface activity, no light-absorbing ability, high pharmacological effect, and so on. Owing to their specific characters, they are indispensable chemicals for industry and our daily lives.COA of Formula: C4H6BrFO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Reductive Cross-Coupling of Aldehydes and Imines Mediated by Visible Light Photoredox Catalysis》 was written by Wang, Rui; Ma, Mengyue; Gong, Xu; Fan, Xinyuan; Walsh, Patrick J.. Name: o-BromobenzaldehydeThis research focused onvicinal amino alc preparation; benzoxazine indolone preparation; iridium photoredox catalyst reductive coupling aryl ketimine aldehyde. The article conveys some information:

In the presence of an iridium photoredox catalyst, aryl ketimines such as 2-BrC6H4N:CPh2 underwent photochem. reductive coupling with aldehydes such as benzaldehyde mediated by N,N-dimethylcyclohexylamine to give di- and triarylamino alcs. such as I. Under photoredox catalysis conditions, the conventional electrophilic reactivity of ketimines is inverted to generate nucleophilic species, allowing reductive coupling with aldehydes. I was converted to benzo-fused morpholine II with a palladium catalyst, while two amino alcs. underwent cyclization and oxidation to yield 3-indolones. In the experiment, the researchers used many compounds, for example, o-Bromobenzaldehyde(cas: 6630-33-7Name: o-Bromobenzaldehyde)

o-Bromobenzaldehyde(cas: 6630-33-7) is used in L-threonine aldolase-catalyzed enantio/diastereoselective aldol reactions.Name: o-BromobenzaldehydeIt is also used in L-threonine aldolase-catalyzed enantio and diastereoselective aldol reactions. Further, it reacts with trichloromethane to prepare 1-(2-bromo-phenyl)-2,2,2-trichloro-ethanol.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Quality Control of 2,5-DibromothiopheneIn 2020 ,《star-shaped thienoviologens for electrochromism and detection of picric acid in aqueous medium》 was published in Dyes and Pigments. The article was written by Yan, Ni; Zhang, Sikun; Li, Guoping; Rao, Bin; Wei, Junji; Wei, Zengsu; Xu, Liang; He, Gang. The article contains the following contents:

Two star-shaped thienoviologens with good redox and emission properties are reported. The results indicate that the increasing number of thiophene rings can strongly weaken the electron-accepting ability and make its first reduction wave shifted to more neg. position, accompanying the decrease of the fluorescence quantum yield. The star-shaped thienoviologens were used as electroactive materials to fabricate electrochromic devices, which showed three-color changes modulated by the different voltages. The star-shaped thienoviologens were used to detect the picric acid (PA) in aqueous medium with good sensitivity and selectivity (Ksv,5a = 1.94 x 105 L/mol; Ksv,5b = 5.38 x 104 L/mol) due to their special mol. architecture and cathodic conjugated scaffold. In the experimental materials used by the author, we found 2,5-Dibromothiophene(cas: 3141-27-3Quality Control of 2,5-Dibromothiophene)

2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene polymerizes by debromination with magnesium catalyzed by nickel compounds to form poly(2,5- thienylene) .Quality Control of 2,5-Dibromothiophene

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Formula: C19H18BrPIn 2020 ,《Syndioselective 3,4-Polymerization of 1-Phenyl-1,3-Butadiene by Rare-Earth Metal Catalysts》 was published in ACS Catalysis. The article was written by Jiang, Yang; Kang, Xiaohui; Zhang, Zhen; Li, Shihui; Cui, Dongmei. The article contains the following contents:

Coordination polymerization of 1-phenyl-1,3-butadiene (1PB) was carried out by diiminophosphinato lutetium complexes 1 and 2, pyridyl-methylene-fluorenyl complexes 3 (Sc 3a; Lu 3b; Y 3c) and 4 (Sc 4a; Lu 4b; Y 4c), β-diiminato yttrium complex 5, bis(imino)aryl gadolinium complex 6, bis(phosphino)carbazolide yttrium complex 7 and bis(phosphinophenyl)amido complex 8. Complexes 1, 2, 3a,b and 4a,b, under the activation of [Ph3C][B(C6F5)4] and AliBu3, show high activities as well as higher than 96.6% 3,4-regio selectivities, of which 1 and 2 are non stereoselective to give atactic 3,4-poly(1PB), while 3a,b and 4a,b exhibit distinguished syndioselectivities (> 95.3% rrrr). However, 3c and 4c are inactive. In addition, complexes 5-7 are also completely inert although they are highly active and cis-1,4 selective for isoprene polymerization On contrary, the analogous cis-1,4 selective complex 8 exhibits syndio- (> 96.1% rrrr) and 3,4-regio (> 99%) selectivity. Hydrogenation of a syndiotactic 3,4-poly(1PB) affords a syndiotactic poly(4-phenyl-1-butene) elastomer with a Tg of 17°C. The cationic cyclization transfers a syndiotactic 3,4-poly(1PB) into a rigid cyclized polyolefin with a Tg as high as 327°C. DFT simulations are employed to illustrate the mechanisms for control of activity and stereo-selectivity from thermodn. and geometric viewpoints. The results came from multiple reactions, including the reaction of Methyltriphenylphosphonium bromide(cas: 1779-49-3Formula: C19H18BrP)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is a lipophilic molecule with a cation allowing for it to be used to deliver molecules to specific cell components. Also considered an antineoplastic agent.Formula: C19H18BrP

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Name: Tris(4-bromophenyl)amineIn 2021 ,《Spacer group-controlled luminescence and response of C3-symmetric triphenylamine derivatives towards force stimuli》 was published in CrystEngComm. The article was written by Han, Yanning; Zhang, Tong; Chen, Xinyu; Chen, Qiao; Xue, Pengchong. The article contains the following contents:

Two C3-sym. triphenylamine derivatives with three terminal cyano units as electron acceptors were prepared to investigate the effect of the spacer group on their photophys. properties and responses towards force. Their electronic transitions were carefully studied by electrochem., solvent-dependent spectroscopy and quantum chem. calculations The results suggested that introducing a double bond between the donor and acceptor results in the longer absorption and emission wavelengths of TPAVCN owing to elevated HOMO and lowered LUMO energy levels and induces a larger excited state dipole moment because of the extended conjugated length. In polar solvents, both TPACN and TPAVCN possessed a longer emission wavelength. Theor. calculations suggested that bathochromic shifts in emission bands could be ascribed to the large polar excited states owing to the light excitation-induced intramol. charge transfer. Moreover, TPAVCN had a larger charge transfer length and average degree of the spatial extension of hole and electron distribution because of its longer mol. length. In crystals, TPAVCN had a longer emission wavelength relative to that of TPACN. Moreover, both compounds could reversibly change their fluorescence under force and solvent annealing stimuli, and their mechanochromic properties were regulated by spacer groups. TPACN changed its fluorescence from blue to cyan with a spectral shift of 12 nm after grinding, but a large spectral shift of 30 nm, and an obvious fluorescent color change from green to yellow were observed while grinding pristine TPAVCN solids. The experimental process involved the reaction of Tris(4-bromophenyl)amine(cas: 4316-58-9Name: Tris(4-bromophenyl)amine)

In general, Tris(4-bromophenyl)amine(cas: 4316-58-9) is often used in the synthesis of porous luminescent covalent–organic polymers (COPs)Name: Tris(4-bromophenyl)amine

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Electric Literature of C7H5BrOIn 2019 ,《Improving and Inverting Cβ-Stereoselectivity of Threonine Aldolase via Substrate-Binding-Guided Mutagenesis and a Stepwise Visual Screening》 was published in ACS Catalysis. The article was written by Chen, Qijia; Chen, Xi; Feng, Jinhui; Wu, Qiaqing; Zhu, Dunming; Ma, Yanhe. The article contains the following contents:

Threonine aldolase (TA)-catalyzed aldol condensation is a powerful tool for C-C bond formation under mild conditions, but the low Cβ-stereoselectivity has hampered its wide application. A stepwise visual screening method was developed to measure the activity and stereoselectivity of threonine aldolase-catalyzed aldol condensation by employing a stereoselective phenylserine dehydratase, enabling direct selection of mutants with higher Cβ-stereoselectivity. Mutants of L-PsTA from Pseudomonas sp. with improved or inverted stereoselectivity toward aromatic aldehydes were obtained by simultaneously mutating amino acid residues which interact with the amino and hydroxyl groups of the substrate and screening the resulting mutant libraries with this method. The mutation and enzyme-substrate docking studies provided some insights into the regulation of the Cβ-stereoselectivity by the enzyme-substrate interactions. This study offers a tool and useful guidance for further engineering of TAs to address the Cβ-stereoselectivity problem. After reading the article, we found that the author used o-Bromobenzaldehyde(cas: 6630-33-7Electric Literature of C7H5BrO)

o-Bromobenzaldehyde(cas: 6630-33-7) is used in L-threonine aldolase-catalyzed enantio/diastereoselective aldol reactions.Electric Literature of C7H5BrOIt is also used in L-threonine aldolase-catalyzed enantio and diastereoselective aldol reactions. Further, it reacts with trichloromethane to prepare 1-(2-bromo-phenyl)-2,2,2-trichloro-ethanol.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary