Category: bromides-buliding-blocks

Iwami, Hikaru; Okamura, Masaya; Kondo, Mio; Masaoka, Shigeyuki published their research in Angewandte Chemie, International Edition in 2021. The article was titled 《Electrochemical Polymerization Provides a Function-Integrated System for Water Oxidation》.Electric Literature of C5H9BrO2 The article contains the following contents:

Water oxidation is a key reaction in natural and artificial photosynthesis. In nature, the reaction is efficiently catalyzed by a metal-complex-based catalyst surrounded by hole-transporting amino acid residues. However, in artificial systems, there is no example of a water oxidation system that has a catalytic center surrounded by hole transporters. Herein, we present a facile strategy to integrate catalytic centers and hole transporters in one system. Electrochem. polymerization of a metal-complex-based precursor afforded a polymer-based material (Poly-1). Poly-1 exhibited excellent hole-transporting ability and catalyzed water oxidation with high performance. It was also revealed that the catalytic activity was almost completely suppressed in the absence of the hole-transporting moieties. The present study provides a novel strategy for constructing efficient mol.-based systems for water oxidation In the part of experimental materials, we found many familiar compounds, such as Ethyl 3-bromopropanoate(cas: 539-74-2Electric Literature of C5H9BrO2)

Ethyl 3-bromopropanoate(cas: 539-74-2) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals.Electric Literature of C5H9BrO2 The most pervasive is the naturally produced bromomethane.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Singh, Abhishek Kumar; Schade, Boris; Wycisk, Virginia; Boettcher, Christoph; Haag, Rainer; von Berlepsch, Hans published their research in Journal of Physical Chemistry B in 2021. The article was titled 《Aggregation of Amphiphilic Carbocyanines: Fluorination Favors Cylindrical Micelles over Bilayered Tubes》.Safety of Ethyl 4-bromobutyrate The article contains the following contents:

The synthesis of a new amphiphilic 5,5,6,6-tetrachlorobenzimidacarbocyanine dye derivative with -(CH2)2-(CF2)5-CF3 chains attached to the nitrogen atoms in the 1,1-position, CF8O3, is reported. Depending on the dye concentration and the addition of MeOH, CF8O3 forms J- and H-aggregates in aqueous solutions The aggregation behavior was investigated using steady-state absorption, linear dichroism, and fluorescence spectroscopy, as well as by cryogenic transmission electron microscopy (cryo-TEM). The J-band of the MeOH-free solution is monomer-like, rather broad, and less red-shifted with respect to the monomer absorption, indicating weak excitonic coupling and disorder effects. Cryo-TEM reveals a diversity of supramol. structures, wherein linear and branched cylindrical micelles dominate. It is concluded that the high stiffness of fluoroalkyl chains does not allow the chains to splay and completely fill up the hydrophobic gap between opposing chromophores. This destabilizes the bilayers and favors the micellar structure motifs instead. The aggregates appearing at 30% MeOH show a split absorption spectrum consisting of a broad blue-shifted H-band and an accompanying sharp red-shifted J-band with perpendicular polarizations. These HJ-type aggregates are also composed of micellar fibers, but these bundle into rope-like strands. For 10% MeOH, a narrow bilayered tube is the dominating morphol. The observed MeOH dependence of aggregation reveals a clear cosolvent effect. The results came from multiple reactions, including the reaction of Ethyl 4-bromobutyrate(cas: 2969-81-5Safety of Ethyl 4-bromobutyrate)

Ethyl 4-bromobutyrate(cas: 2969-81-5) 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.Safety of Ethyl 4-bromobutyrate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Name: 4-Bromo-1-(bromomethyl)-2-fluorobenzeneOn November 15, 2021 ,《Substituted dienes prepared from betulinic acid – Synthesis, cytotoxicity, mechanism of action, and pharmacological parameters》 appeared in European Journal of Medicinal Chemistry. The author of the article were Pokorny, Jan; Olejnikova, Denisa; Frydrych, Ivo; Liskova, Barbora; Gurska, Sona; Benicka, Sandra; Sarek, Jan; Kotulova, Jana; Hajduch, Marian; Dzubak, Petr; Urban, Milan. The article conveys some information:

A set of new substituted dienes were synthesized from betulinic acid by its oxidation to 30-oxobetulinic acid followed by the Wittig reaction. Cytotoxicity of all compounds was tested in vitro in eight cancer cell lines and two noncancer fibroblasts. Almost all dienes were more cytotoxic than betulinic acid. Four compounds had IC50 below 5μmol/L; I and II were selected for studies of the mechanism of action. Cell cycle anal. revealed an increase in the number of apoptotic cells at 5 x IC50 concentration, where activation of irreversible changes leading to cell death can be expected. Both I and II led to the accumulation of cells in the G0/G1 phase with partial inhibition of DNA/RNA synthesis at 1 x IC50 and almost complete inhibition at 5 x IC50. Interestingly, compound II at 5 x IC50 caused the accumulation of cells in the S phase. Higher concentrations of tested drugs probably inhibit more off-targets than lower concentrations Mechanisms disrupting cellular metabolism can induce the accumulation of cells in the S phase. Both compounds I and II trigger selective apoptosis in cancer cells via intrinsic pathway, which we have demonstrated by changes in the expression of the crucial apoptosis-related protein. Pharmacol. parameters of derivative I were superior to II, therefore I was the finally selected candidate for the development of anticancer drug. In the experiment, the researchers used 4-Bromo-1-(bromomethyl)-2-fluorobenzene(cas: 76283-09-5Name: 4-Bromo-1-(bromomethyl)-2-fluorobenzene)

4-Bromo-1-(bromomethyl)-2-fluorobenzene(cas: 76283-09-5) 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. Moreover, several studies demonstrate that the average proportion of bromine in drugs is significantly higher than that in natural products. Name: 4-Bromo-1-(bromomethyl)-2-fluorobenzene

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Spectroscopic and electronic structure characterization of hydrogen bonding in 2-Bromohydroquinone》 was written by Malaganvi, Shivanand S.; Tonannavar Yenagi, Jayashree; Tonannavar, J.. SDS of cas: 583-69-7 And the article was included in Journal of Molecular Structure on April 5 ,2019. The article conveys some information:

2-Bromohydroquinone species form both intra- and inter-mol. H-bonds. The evidences for the H-bonds have been observed in the solid-phase Mid IR (4000-400 cm-1) and Near IR (8000-5000 cm-1) absorption spectra with two intensely broad bands near 3263 and 3222 cm-1 and a broad absorption in 7000-5200 cm-1 with a band maximum at 6335 cm-1. Dimer and trimer models with DFT’s B3LYP and BP86 functionals using 6-31G(d) and 6-311++G(d,p) basis sets have been proposed for the -O-H···O bonding in 2-Bromohydroquinone. Out of the four predicted conformers, one trans and one cis conformers with nearly 1:1 Boltzmann populations, are separated by very small energy difference of 0.03 kcal/mol and this is confirmed by two chem. shifts at 9.0 and 9.3 ppm from an 1H NMR spectrum. On the basis of Quantum Theory of Atoms in Mols. (AIM) and reduced d. gradient plots of electron densities and its isosurfaces by non-covalent interactions (NCI) method, the influence of the -O-H···Br, weak van der Waals and -O-H···O bond interactions on the stability of dimer and trimer structures have been analyzed. From the natural bond orbital (NBO) anal., it is explained that the formation of H-bonding may be attributed to charge transfer from the lone pair orbital n(O) of the base Oxygen into the vacant antibonding orbital σ*(OH) of the acid OH in the -O-H···O bonding. The Near IR concentration-dependent spectra demonstrate that the sample of 2-Bromohydroquinone is composed of -O-H···O bonded species and dissociate into non-bonded species as the mole fraction of the solvent (acetonitrile/1,4-dioxane) is increased. The band observed at 7095 cm-1 at 0.09 M is identified as the first overtone of the -O-H stretching mode of the weak complex of 2-Bromohydroquinone and acetonitrile. The solvent effects on all the observed solution-phase NIR spectra are not ruled out. In addition to this study using 2-Bromobenzene-1,4-diol, there are many other studies that have used 2-Bromobenzene-1,4-diol(cas: 583-69-7SDS of cas: 583-69-7) was used in this study.

2-Bromobenzene-1,4-diol(cas: 583-69-7) belongs to organobromine compounds.Organobromine chemicals are produced naturally by an array of biological and other chemical processes in our environment. Some of these compounds are identical to man-made organobromine compounds, such as methyl bromide, bromoform, and bromophenols, but many others are entirely new moleclar entities, often possessing extraordinary and important biological properties. SDS of cas: 583-69-7

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary