Category: bromides-buliding-blocks

《N-Heterocyclic Silylenes as Ligands in Transition Metal Carbonyl Chemistry: Nature of Their Bonding and Supposed Innocence》 was published in Chemistry – A European Journal in 2020. These research results belong to Krahfuss, Mirjam J.; Nitsch, Joern; Bickelhaupt, F. Matthias; Marder, Todd B.; Radius, Udo. Computed Properties of C5BrMnO5 The article mentions the following:

A study on the reactivity of the N-heterocyclic silylene Dipp2NHSi (1,3-bis(diisopropylphenyl)-1,3-diaza-2-silacyclopent-4-en-2-ylidene) with the transition metal complexes [Ni(CO)4], [M(CO)6] (M = Cr, Mo, W), [Mn(CO)5(Br)] and [(η5-C5H5)Fe(CO)2(I)] is reported. N-heterocyclic silylenes, the higher homologs of the now ubiquitous NHC ligands, show a remarkably different behavior in coordination chem. compared to NHC ligands. Calculations on the electronic features of these ligands revealed significant differences in the frontier orbital region which lead to some peculiarities of the coordination chem. of silylenes, as demonstrated by the synthesis of the dinuclear, NHSi-bridged complex [{Ni(CO)2(μ-Dipp2NHSi)}2] (2), complexes [M(CO)5(Dipp2NHSi)] (M = Cr 3, Mo 4, W 5), [Mn(CO)3(Dipp2NHSi)2(Br)] (9) and [(η5-C5H5)Fe(CO)2(Dipp2NHSi-I)] (10). DFT calculations on several model systems [Ni(L)], [Ni(CO)3(L)], and [W(CO)5(L)] (L = NHC, NHSi) reveal that carbenes are typically the much better donor ligands with a larger intrinsic strength of the metal-ligand bond. The decrease going from the carbene to the silylene ligand is mainly caused by favorable electrostatic contributions for the NHC ligand to the total bond strength, whereas the orbital interactions were often found to be higher for the silylene complexes. Also, the contribution of σ- and π-interaction depends significantly on the system under study. The σ-interaction is often much weaker for the NHSi ligand compared to NHC but the π-interaction prevails for many NHSi complexes. For the carbonyl complexes, the NHSi ligand is the better σ-donor ligand, and contributions of π-symmetry play only a minor role for the NHC and NHSi co-ligands.Bromopentacarbonylmanganese(I)(cas: 14516-54-2Computed Properties of C5BrMnO5) was used in this study.

Bromopentacarbonylmanganese(I)(cas: 14516-54-2) has many other uses. It is used in the formation of (eta6-arene)tricarbonylmanganese(I) by reacting with arene (arene= hexamethyl benzene, 1,2,4,5-tetramethyl benzene, mesitylene, p-xylene and toluene) in the presence silver salt.Computed Properties of C5BrMnO5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Intramolecular Cyclization of Brominated Oxime Ether Promoted with Ytterbium(0) to the Synthesis of Cyclic Imines》 was published in European Journal of Organic Chemistry in 2020. These research results belong to Wang, Yiqiong; Huang, Fei; Zhang, Songlin. Name: 4-Bromobutanoic acid The article mentions the following:

The first utility of ytterbium(0) as a mediating-metal in the intramol. cyclization of brominated oxime ether was reported in this paper. In contrast to the prior methods, the N-O bond was used as a receptor of nucleophilic reagent, rather than as a source of N-centered radicals. Cyclic imines were obtained in this one-pot reaction with a broad scope of substrates and feasible reaction conditions. In the part of experimental materials, we found many familiar compounds, such as 4-Bromobutanoic acid(cas: 2623-87-2Name: 4-Bromobutanoic acid)

4-Bromobutanoic acid(cas: 2623-87-2) belongs to carboxylic acids. The chief chemical characteristic of the carboxylic acids is their acidity. They are generally more acidic than other organic compounds containing hydroxyl groups but are generally weaker than the familiar mineral acids (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).Name: 4-Bromobutanoic acid

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Discovery of IAP-recruiting BCL-XL PROTACs as potent degraders across multiple cancer cell lines》 was published in European Journal of Medicinal Chemistry in 2020. These research results belong to Zhang, Xuan; He, Yonghan; Zhang, Peiyi; Budamagunta, Vivekananda; Lv, Dongwen; Thummuri, Dinesh; Yang, Yang; Pei, Jing; Yuan, Yaxia; Zhou, Daohong; Zheng, Guangrong. Quality Control of Methyl 3-bromopropanoate The article mentions the following:

Targeting BCL-XL via PROTACs is a promising strategy in reducing BCL-XL inhibition associated platelet toxicity. Recently, we reported potent BCL-XL PROTAC degraders that recruit VHL or CRBN E3 ligase. However, low protein expression or mutation of the responsible E3 ligase has been known to result in decreased protein degradation efficiency of the corresponding PROTACs. To overcome these mechanisms of resistance, PROTACs based on recruiting alternative E3 ligases could be generated. Thus, we designed and synthesized a series of PROTACs that recruit IAP E3 ligases for BCL-XL degradation Among those PROTACs, compound 8a(I) efficiently degrades BCL-XL in malignant T-cell lymphoma cell line MyLa 1929 while CRBN-based PROTACs that have high potency in other cancer cell lines show compromised potency, likely due to the low CRBN expression. Moreover, compared with the parent compound ABT-263, PROTAC 8a shows comparable cell killing effects in MyLa 1929 cells whereas the on-target platelet toxicity is significantly reduced. Our findings expand the anti-tumor spectra of BCL-XL degraders and further highlight the importance of selecting suitable E3 members to achieve effective cellular activity. In addition to this study using Methyl 3-bromopropanoate, there are many other studies that have used Methyl 3-bromopropanoate(cas: 3395-91-3Quality Control of Methyl 3-bromopropanoate) was used in this study.

Methyl 3-bromopropanoate(cas: 3395-91-3) belongs to bromides. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents.Quality Control of Methyl 3-bromopropanoate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Selective Mechanochemical Monoarylation of Unbiased Dibromoarenes by In-situ Crystallization》 was published in Journal of the American Chemical Society in 2020. These research results belong to Seo, Tamae; Kubota, Koji; Ito, Hajime. Safety of 2,5-Dibromothiophene The article mentions the following:

Palladium-catalyzed Suzuki-Miyaura cross-coupling reactions of liquid, unbiased dibromoarenes under mechanochem. conditions selectively afford the monoarylated products Ar-Ar1 [Ar = 2-BrC6H4, 2-Br-4,5-di-FC6H2, 4-Br-3-thienyl; Ar1 = Ph, 4-MeOC6H4, 2-naphthyl, etc.]. The lower reactivity of the crystalline monoarylated products relative to the liquid starting materials should be attributed predominantly to the low diffusion efficiency of the former in the re-action mixture, which results in a selective monoarylation. The present study sheds light on a novel approach using in-situ phase transitions in solids to design selective organic transfor-mations that are difficult to achieve via conventional solution-based synthesis. In the experiment, the researchers used many compounds, for example, 2,5-Dibromothiophene(cas: 3141-27-3Safety of 2,5-Dibromothiophene)

2,5-Dibromothiophene(cas: 3141-27-3) , is mainly used as pharmaceutical intermediate and synthesis intermediate. 2,5-Dibromothiophene may be used in the preparation of soluble α,ω-diformyl-a-oligothiophenes.Safety of 2,5-Dibromothiophene

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Phage-Guided Targeting, Discriminative Imaging, and Synergistic Killing of Bacteria by AIE Bioconjugates》 was published in Journal of the American Chemical Society in 2020. These research results belong to He, Xuewen; Yang, Yujun; Guo, Yongcan; Lu, Shuguang; Du, Yao; Li, Jun-Jie; Zhang, Xuepeng; Leung, Nelson L. C.; Zhao, Zheng; Niu, Guangle; Yang, Shuangshuang; Weng, Zhi; Kwok, Ryan T. K.; Lam, Jacky W. Y.; Xie, Guoming; Tang, Ben Zhong. Reference of 4-Bromobutanoic acid The article mentions the following:

New agents with particular specificity toward targeted bacteria and superefficacy in antibacterial activity are urgently needed in facing the crisis of worldwide antibiotic resistance. Herein, a novel strategy by equipping bacteriophage (PAP) with photodynamic inactivation (PDI)-active AIEgens (luminogens with aggregation-induced emission property) was presented to generate a type of AIE-PAP bioconjugate with superior capability for both targeted imaging and synergistic killing of certain species of bacteria. The targeting ability inherited from the bacteriophage enabled the bioconjugates to specifically recognize the host bacteria with preserved infection activity of phage itself. Meanwhile, the AIE characteristic empowered them a monitoring functionality, and the real-time tracking of their interactions with targets was therefore realized via convenient fluorescence imaging. More importantly, the PDI-active AIEgens could serve as powerful in situ photosensitizers producing high-efficiency reactive oxygen species (ROS) under white light irradiation As a result, selective targeting and synergistic killing of both antibiotic-sensitive and multi-drug-resistant (MDR) bacteria were successfully achieved in in vitro and in vivo antibacterial tests with excellent biocompatibility. This novel AIE-phage integrated strategy would diversify the existing pool of antibacterial agents and inspire the development of promising drug candidates in the future. The results came from multiple reactions, including the reaction of 4-Bromobutanoic acid(cas: 2623-87-2Reference of 4-Bromobutanoic acid)

4-Bromobutanoic acid(cas: 2623-87-2) belongs to carboxylic acids. The chief chemical characteristic of the carboxylic acids is their acidity. They are generally more acidic than other organic compounds containing hydroxyl groups but are generally weaker than the familiar mineral acids (e.g., hydrochloric acid, HCl, sulfuric acid, H2SO4, etc.).Reference of 4-Bromobutanoic acid

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Bis-imidazolium functionalized self-crosslinking block polynorbornene anion exchange membrane》 was published in International Journal of Hydrogen Energy in 2020. These research results belong to Zhang, Feng; He, Xiaohui; Cheng, Changwen; Huang, Shengmei; Duan, Yapeng; Zhu, Chuanyi; Guo, Yan; Wang, Kai; Chen, Defu. Product Details of 629-03-8 The article mentions the following:

Anion exchange membranes (AEMs) are widely studied as an important component of fuel cells. In this paper, series self-crosslinking AEMs are obtained by copolymerization of the prepared bis-imidazolium functionalized ionic liquids The block copolymer shows excellent thermal stability with a decomposition temperature (Td) of 300°C. And the mech. properties of AEMs in OH- are significantly improved due to the crosslinking of epoxy groups. The transmission electron microscopy (TEM) test results show a good microscopic phase separation structure and form ion channels in the membranes, which is benefited to ions conductivity The OH- conductivity of AEMs is measured as above 2410-3Scm-1 and 9510-3Scm-1 at 30°C and 80°C, resp. In addition, the AEMs also exhibits excellent swelling performance, the highest is only 20.86% at 80°C. And the conductivity of all AEMs remained above 90% after being immersed in 1MNaOH aqueous at 60°C for 250 h. The peak power d. of the AEMs reaches 207.95 mW cm-2 at c.d. of 403 mA cm-2. In addition to this study using 1,6-Dibromohexane, there are many other studies that have used 1,6-Dibromohexane(cas: 629-03-8Product Details of 629-03-8) was used in this study.

1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of solvent processable and conductive polyfluorene ionomers for alkaline fuel cell applications; synthesis of cross-linkable regioregular poly(3-(5-hexenyl)thiophene) (P3HNT) for stabilizing the film morphology in polymer photovoltaic cells.Product Details of 629-03-8

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Trifluoromethyl Sulfoxides: Reagents for Metal-Free C-H Trifluoromethylthiolation》 was published in Angewandte Chemie, International Edition in 2020. These research results belong to Wang, Dong; Carlton, C. Grace; Tayu, Masanori; McDouall, Joseph J. W.; Perry, Gregory J. P.; Procter, David J.. Recommanded Product: 5-Bromobenzo[d][1,3]dioxole The article mentions the following:

Indoles, pyrroles, thiophenes, a benzothiophene, a benzofuran, and arenes underwent metal-free regioselective trifluoromethylthiolation with trifluoromethyl sulfoxides RCH2S(:O)CF3 (R = Ph, EtO2C) mediated by triflic anhydride and diethylamine in acetonitrile or nitromethane to yield heteroaryl and aryl trifluoromethyl thioethers. An aryl(ethoxycarbonylmethyl)(trifluoromethyl)sulfonium triflate was isolated as a trifluoromethylthiolation intermediate and its structure determined by X-ray crystallog., supporting an interrupted Pummerer reaction mechanism for the trifluoromethylthiolation. In the experiment, the researchers used 5-Bromobenzo[d][1,3]dioxole(cas: 2635-13-4Recommanded Product: 5-Bromobenzo[d][1,3]dioxole)

Furthermore, the coupling of 5-Bromobenzo[d][1,3]dioxole(cas: 2635-13-4) with β-methallyl alcohol was catalyzed by Pd(OAc)2 in combination with P(t-Bu)3.Recommanded Product: 5-Bromobenzo[d][1,3]dioxole

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Enantioselective Cross-Exchange between C-I and C-C σ Bonds》 were Sun, Yu-Li; Wang, Xing-Ben; Sun, Feng-Na; Chen, Qian-Qian; Cao, Jian; Xu, Zheng; Xu, Li-Wen. And the article was published in Angewandte Chemie, International Edition in 2019. Computed Properties of C19H18BrP The author mentioned the following in the article:

A palladium-catalyzed enantioselective intramol. σ-bond cross-exchange between C-I and C-C bonds is realized, providing chiral indanones bearing an alkyl iodide group and an all-carbon quaternary stereocenter, e.g., I. Pd/TADDOL-derived phosphoramidite is found to be an efficient catalytic system for both C-C bond cleavage and alkyl iodide reductive elimination. In addition to aryl iodides, aryl bromides can also be used for this transformation in the presence of KI. D.-functional theory (DFT) calculation studies support the ring-opening of cyclobutanones, e.g., II, occurring through an oxidative addition/reductive elimination process involving PdIV species. In the experiment, the researchers used many compounds, for example, Methyltriphenylphosphonium bromide(cas: 1779-49-3Computed Properties of 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.Computed Properties of C19H18BrP

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Heteroaryl Phosphonates as Noncovalent Inhibitors of Both Serine- and Metallocarbapenemases》 were Pemberton, Orville A.; Jaishankar, Priyadarshini; Akhtar, Afroza; Adams, Jessie L.; Shaw, Lindsey N.; Renslo, Adam R.; Chen, Yu. And the article was published in Journal of Medicinal Chemistry in 2019. Application In Synthesis of 3,5-Dibromoaniline The author mentioned the following in the article:

Gram-neg. pathogens expressing serine β-lactamases (SBLs) and metallo-β-lactamases (MBLs), especially those with carbapenemase activity, threaten the clin. utility of almost all β-lactam antibiotics. Here we describe the discovery of a heteroaryl phosphonate scaffold that exhibits noncovalent cross-class inhibition of representative carbapenemases, specifically the SBL KPC-2 and the MBLs NDM-1 and VIM-2. The most potent lead, compound 16, exhibited low nM to low μM inhibition of KPC-2, NDM-1, and VIM-2. Compound 16 potentiated imipenem efficacy against resistant clin. and laboratory bacterial strains expressing carbapenemases while showing some cytotoxicity toward human HEK293T cells only at concentrations above 100μg/mL. Complex structures with KPC-2, NDM-1, and VIM-2 demonstrate how these inhibitors achieve high binding affinity to both enzyme classes. These findings provide a structurally and mechanistically new scaffold for drug discovery targeting multidrug resistant Gram-neg. pathogens and more generally highlight the active site features of carbapenemases that can be leveraged for lead discovery. The experimental part of the paper was very detailed, including the reaction process of 3,5-Dibromoaniline(cas: 626-40-4Application In Synthesis of 3,5-Dibromoaniline)

3,5-Dibromoaniline(cas: 626-40-4) belongs to anime. To avoid the problem of multiple alkylation, methods have been devised for “blocking” substitution so that only one alkyl group is introduced. The Gabriel synthesis is one such method; it utilizes phthalimide, C6H4(CO)2NH, whose one acidic hydrogen atom has been removed upon the addition of a base such as KOH to form a salt.Application In Synthesis of 3,5-Dibromoaniline

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Physical properties of ethylene glycol-based deep eutectic solvents》 were Ibrahim, Rusul Khaleel; Hayyan, Maan; AlSaadi, Mohammed Abdulhakim; Ibrahim, Shaliza; Hayyan, Adeeb; Hashim, Mohd Ali. And the article was published in Journal of Molecular Liquids in 2019. Quality Control of Methyltriphenylphosphonium bromide The author mentioned the following in the article:

Deep eutectic solvents (DESs) have been widely recognized as ionic liquids (ILs) analogs due to their low production cost and superior favorable properties over conventional ILs. Studying the phys. properties of these solvents will contribute to design processes involving DESs. In this study, five DESs have been successfully prepared using ethylene glycol (EG) as hydrogen bond donor (HBD) with N,N-diethylethanolammonium chloride (DAC), benzyltriphenylphosphonium chloride (BTPC), choline chloride (ChCl), methyltriphenylphosphonium bromide (MTPB) and tetra-n-butylammonium bromide (TBAB) as salts. The f.p. of each of the five studied DESs was measured using Differential Scanning Calorimetry (DSC) and the DES functional groups were identified using the Fourier transform IR (FTIR) spectroscopy. Moreover, the viscosity, d., elec. conductivity and surface tension were measured at a temperature range of 293.15-353.15 K and they were highly affected by the variation of the temperature It is worth mentioning that the studied DESs showed many phys. characteristics similar to that of ILs, which boost their possibilities to be employed in interdisciplinary domains.Methyltriphenylphosphonium bromide(cas: 1779-49-3Quality Control of Methyltriphenylphosphonium bromide) was used in this study.

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.Quality Control of Methyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary