Tag: 200-300

《Design of twisted conjugated molecular systems towards stable multi-colored electrochromic polymers》 was published in Dyes and Pigments in 2020. These research results belong to Gu, Hua; Xue, Yu; Hu, Faqi; Jian, Nannan; Lin, Kaiwen; Wu, Tao; Liu, Ximei; Xu, Jingkun; Lu, Baoyang. HPLC of Formula: 2635-13-4 The article mentions the following:

Promising advancement of conjugated polymers in electrochromic devices require to design high-performance electrochromic polymers with rich color conversion and long-term stability under cyclic elec. loads. Here we report a new strategy in developing multi-colored electrochromic polymers with good stability via twisted conjugated mol. engineering. A series of twisted hybrid precursors are synthesized by coupling ortho-alkylenedioxybenzenes with EDOT units, and their corresponding polymers are facilely electrosynthesized at relatively low polymerization potentials. The structure-property relationships of such ortho-alkylenedioxybenzene-EDOT hybrid precursors and polymers are systematically elucidated via DFT calculations, spectral, morphol., electrochem. and spectroelectrochem. anal., etc. We demonstrate that the dihedral angle between ortho-alkylenedioxybenzenes and EDOT moieties can substantially affect the electrochem. and electrochromic properties of polymers. As the dihedral angle and electron cloud d. increases, these hybrid polymers display distinct multiple color switching nature and good overall performance including high coloration efficiency (>200 cm2 C-1), decent optical contrast (>45%), fast switching (<1 s), and excellent switching stability (96% of optical contrast after 3500 cycling) under cyclic elec. loads. With these findings, this work will provide novel insights for rational design of stable and highly efficient multi-colored electrochromic polymers. In the part of experimental materials, we found many familiar compounds, such as 5-Bromobenzo[d][1,3]dioxole(cas: 2635-13-4HPLC of Formula: 2635-13-4)

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.HPLC of Formula: 2635-13-4

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Iron-catalyzed cross-coupling of Bis-(aryl)manganese nucleophiles with alkenyl halides: optimization and mechanistic investigations》 was published in Molecules in 2020. These research results belong to Rousseau, Lidie; Desaintjean, Alexandre; Knochel, Paul; Lefevre, Guillaume. Safety of 5-Bromobenzo[d][1,3]dioxole The article mentions the following:

Various substituted bis-(aryl)manganese species I (R = 4-MeOC6H4, 4-OCF3, 3,4-dioxole, etc.) were prepared from aryl bromides by one-pot insertion of magnesium turnings in the presence of LiCl and in situ trans-metalation with MnCl2 in THF at -5° within 2 h. These bis-(aryl)manganese reagents underwent smooth iron-catalyzed cross-couplings using 10 mol% Fe(acac)3 with various functionalized alkenyl iodides and bromides in 1 h at 25°. The aryl-alkenyl cross-coupling reaction mechanism was thoroughly investigated through paramagnetic 1H-NMR, which identified the key role of tris-coordinated ate-iron(II) species in the catalytic process.5-Bromobenzo[d][1,3]dioxole(cas: 2635-13-4Safety of 5-Bromobenzo[d][1,3]dioxole) was used in this study.

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.Safety of 5-Bromobenzo[d][1,3]dioxole

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2019,RSC Advances included an article by Wang, Caihong; Guan, Xiaoqin; Yuan, Yongli; Wu, Yong; Tan, Shuai. Recommanded Product: 629-03-8. The article was titled 《Polyacrylamide crosslinked by bis-vinylimidazolium bromide for high elastic and stable hydrogels》. The information in the text is summarized as follows:

A series of ionic compounds 1,n-dialkyl-3,3′-bis-l-vinylimidazolium bromide (CnVIM) are prepared and employed to crosslink acrylamide for polyacrylamide (PAAM) hydrogel preparation via in situ solution polymerization The swelling behavior, mech. properties and thermal stability of the prepared CnVIM crosslinked PAAM hydrogels are investigated. CnVIM effectively crosslink the PAAM networks to form porous structures in the hydrogel, which could stably absorb water as much as 75.9 fold in weight without structural degradation The prepared hydrogels could endure compressive stress up to 1.95 MPa and compressive deformation more than 90%. Meanwhile, the CnVIM crosslinked networks show superior thermal stability, and could retain the structural integrity under 150°C for more than 240 h. The swelling degradation resistance, mech. strength and thermal stability of CnVIM crosslinked hydrogels are much better than those of a conventional N,N’-methylenebisacrylamide crosslinked PAAM hydrogel. Using bis-vinylimidazolium bromides as crosslinkers provides an optional strategy for constructing thermally and mech. robust hydrogel networks. In the part of experimental materials, we found many familiar compounds, such as 1,6-Dibromohexane(cas: 629-03-8Recommanded Product: 629-03-8)

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.Recommanded Product: 629-03-8

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2022,Marine Drugs included an article by Chao, Rong; Said, Gulab; Zhang, Qun; Qi, Yue-Xuan; Hu, Jie; Zheng, Cai-Juan; Zheng, Ji-Yong; Shao, Chang-Lun; Chen, Guang-Ying; Wei, Mei-Yan. SDS of cas: 76283-09-5. The article was titled 《Design, Semisynthesis, Insecticidal and Antibacterial Activities of a Series of Marine-Derived Geodin Derivatives and Their Preliminary Structure-Activity Relationships》. The information in the text is summarized as follows:

To enhance the biol. activity of the natural product geodin isolated from the marine-derived fungus Aspergillus sp., a series of new ether derivatives I [R = Et, 2-bromobenzyl, 2-chlorobenzyl, etc.] was designed and semisynthesized using a high-yielding one-step reaction. In addition, the insecticidal and antibacterial activities of all geodin congeners I were evaluated systematically. Most of these derivatives I showed better insecticidal activities against Helicoverpa armigera Hubner than Geodin. In particular, I [R = 2,3,4,5-tetrafluorobenzyl] showed potent insecticidal activity with an IC50 value of 89μM, comparable to the pos. control azadirachtin (IC50 = 70μM). Addnl., I [R = 2-chlorobenzyl, 2-fluorobenzyl, 3,5-difluorobenzyl, 2,3,4-trifluorobenzyl, 4-cyanobenzyl and 2-fluoro-3-chlorobenzyl] showed strong antibacterial activity against Staphylococcus aureus and Aeromonas salmonicida with MIC values in the range of 1.15-4.93μM. The preliminary structure-activity relationships indicated that the introduction of halogenated benzyl especially fluorobenzyl, into geodin and substitution of 4-OH was a key factors in increasing the insecticidal and antibacterial activities of geodin. The experimental process involved the reaction of 4-Bromo-1-(bromomethyl)-2-fluorobenzene(cas: 76283-09-5SDS of cas: 76283-09-5)

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. SDS of cas: 76283-09-5 In contrast, terrestrial plants account only for a few bromine-containing compounds.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

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

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

Synthetic Route of C9H11BrO3In 2021 ,《Rhodium-Catalyzed Regiodivergent Synthesis of Alkylboronates via Deoxygenative Hydroboration of Aryl Ketones: Mechanism and Origin of Selectivities》 was published in ACS Catalysis. The article was written by Zhang, Bing; Xu, Xin; Tao, Lei; Lin, Zhenyang; Zhao, Wanxiang. The article contains the following contents:

Here, authors report an efficient rhodium-catalyzed deoxygenative borylation of ketones to synthesize alkylboronates, in which the regioselectivity can be switched by the choice of the ligand. The linear alkylboronates were obtained exclusively in the presence of P(nBu)3, and PPh2Me favored the formation of branched alkylboronates. The protocol also allows access to 1,1,2-triboronates from the readily available ketones. Mechanistic studies suggest that this Rh-catalyzed deoxygenative borylation of ketones goes through an alkene intermediate, which undergoes regiodivergent hydroboration to afford linear and branched alkylboronates. The different steric effects of PPh2Me and P(nBu)3 were responsible for product selectivity by d. functional theory calculations The alkene intermediate can alternatively undergo sequential dehydrogenative borylation and hydroboration to deliver the triboronates. In the experimental materials used by the author, we found 1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8Synthetic Route of C9H11BrO3)

1-Bromo-3,4,5-trimethoxybenzene(cas: 2675-79-8) is an important raw material and intermediate used in organic synthesis, pharmaceuticals, agrochemicals and dyestuff.Synthetic Route of C9H11BrO31-Bromo-3,4,5-trimethoxybenzene can be used to synthesize analogs of HA14-1, which shows promising anticancer properties.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Computed Properties of C5BrMnO5In 2021 ,《Catalytic Hydrogenation of Polyurethanes to Base Chemicals: From Model Systems to Commercial and End-of-Life Polyurethane Materials》 appeared in JACS Au. The author of the article were Gausas, Laurynas; Kristensen, Steffan K.; Sun, Hongwei; Ahrens, Alexander; Donslund, Bjarke S.; Lindhardt, Anders T.; Skrydstrup, Troels. The article conveys some information:

Polyurethane (PU) is a highly valued polymer prepared from diisocyanates and polyols, and it is used in everyday products, such as shoe soles, mattresses, and insulation materials, but also for the construction of sophisticated parts of medical devices, wind turbine blades, aircrafts, and spacecrafts, to name a few. As PU is most commonly used as a thermoset polymer composed of cross-linked structures, its recycling is complicated and inefficient, leading to increasing PU waste accumulating every year. Catalytic hydrogenation represents an atom-efficient means for the deconstruction of polyurethanes, but so far the identification of an efficient catalyst for the disassembly of real-life and end-of-life PU samples has not been demonstrated. In this work, we reveal that a com. available catalyst, Ir-iPrMACHO, under 30 bar H2 and 150-180°C, is a general catalyst for the effective hydrogenation of the four cornerstones of PU: flexible solid, flexible foamed, rigid solid, and rigid foamed, leading to the isolation of aromatic amines and a polyol fraction. For the first time, a variety of com. PU materials, including examples of foams, inline skating wheels, shoe soles, and insulation materials, has been deconstructed into the two fractions. Most desirable, our reaction conditions include the use of iso-Pr alc. as a representative of a green solvent. It is speculated that a partial glycolysis at the surface of the PU particles is taking place in this solvent and reaction temperatures in the presence of catalytic amounts of base. As such a more efficient hydrogenation of the solubilized PU fragments in iso-Pr alc. becomes possible. As the isolated anilines are precursors to the original isocyanate building blocks, and methods for their conversion are well-known, the work reported in this paper provides a realistic indication of a potential circular plastic economy solution for PU. Preliminary experiments were also undertaken applying Mn-iPrMACHO for the deconstruction of a com. flexible PU foam. Although successful, more forcing conditions were required than those when applying Ir-iPrMACHO.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

In 2022,Eftaiha, Ala’a F.; Qaroush, Abdussalam K.; Abo-shunnar, Ahmad S.; Hammad, Suhad B.; Assaf, Khaleel I.; Al-Qaisi, Feda’a M.; Paige, Matthew F. published an article in Langmuir. The title of the article was 《Interfacial Behavior of Modified Nicotinic Acid as Conventional/Gemini Surfactants》.Category: bromides-buliding-blocks The author mentioned the following in the article:

We report the synthesis and monolayer properties of conventional and gemini surfactants composed of nicotinic acid-based head groups with an emphasis on assessing how chem. structures affect the behavior of monolayers. A combination of Brewster angle microscopy and at. force microscopy showed that pure hexadecyl nicotinate formed rippled strands in monolayers, and the gemini correspondents with either flexible or rigid organic linkers resulted in lobed-compact domains, which provides a simple method for patterning air-water and solid-air interfaces. The structural differences between conventional and gemini nicotinic acid-based surfactants could be explained by the interplay between line tension (that favors the formation of circular domains), balanced by dipole-dipole repulsion interaction between headgroups, which promotes extended domains. Miscibility and morphol. studies of the modified nicotinic acid surfactants with palmitic acid demonstrated that the properties of mixed films can be controlled by the structure of the former. Excess Gibbs free energies of mixing indicated that the mixed films were less stable than the pure monolayers, and the pos. deviations from ideality were the largest in the case of gemini surfactants.1,4-Bis(bromomethyl)benzene(cas: 623-24-5Category: bromides-buliding-blocks) was used in this study.

1,4-Bis(bromomethyl)benzene(cas: 623-24-5) 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.Category: bromides-buliding-blocks

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary