Tag: M.W=200-250

Windmon, Nicole published the artcileThe role of neat substrates in phase-vanishing and tandem phase-vanishing reactions, Product Details of C6H12Br2, the publication is Tetrahedron Letters (2008), 49(46), 6543-6546, database is CAplus.

Phase-vanishing reactions are triphasic reactions, which involve a reagent, a liquid perfluoroalkane as a phase screen, and a substrate. Aromatization, isomerization, and halogenation of neat substrates under phase-vanishing conditions gave the expected products in good to excellent yields. In tandem single-phase-phase-vanishing reaction, two reactants, placed in the top phase, afforded the intermediate, which in a subsequent phase-vanishing reaction reacted with the reagent from the bottom phase to give the final product. The reaction worked well under solvent-free conditions on liquid substrates and intermediates. With solids, results were better if an addnl. solvent was employed.

Tetrahedron Letters published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C9H6N2O2, Product Details of C6H12Br2.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Azizov, Ilgar published the artcileStudying droplet retention in porous media by novel microfluidic methods, Synthetic Route of 143-15-7, the publication is Chemical Engineering Science (2022), 248(Part_A), 117152, database is CAplus.

Transport of oil drops through porous media is an important topic in the oil and gas industry. Oil drops that are present in produced water contribute to injectivity decline during re-injection due to retention in pores. In the literature, the retention phenomenon is typically studied by means of core/packed bed flooding, which struggles to provide a simple and inexpensive way to visualize retention events at the pore scale. This paper demonstrates a microfluidic method for studying the transport of dilute oil-in-water emulsions through porous media. The method allows identification of every single retention event at the capillary level and quant. anal. of the spatial distribution of the retained drops over pore volumes injected. Experiments were carried out for monodisperse and tailored polydisperse emulsions. Moreover, several drop sizes, flow rates, and dispersed phase concentrations were tested. The results showed that the drop size has a dramatic effect on the pore clogging. Drops that are larger than pore throats underwent complete retention, while drops that are smaller than pore throats showed little to no retention in the monodisperse emulsion experiments Addnl., the experiments with polydisperse emulsions showed that the larger drops are facilitators for the retention of the smaller drops, and the latter are unlikely to experience significant retention independently of the former. The flow rates affected flow re-entry mechanisms of the larger drops, while for the smaller drops it affected only the number of retention events. It was identified that dispersed phase concentration has a significant effect in experiments with limited pore volumes injected. At low concentration, the obtained statistical sample was not sufficiently large to unravel the trends. The developed method presents a solid foundation for further experiments and developments in microfluidic studies of the emulsion transport.

Chemical Engineering Science published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Synthetic Route of 143-15-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

El-Tabei, A. S. published the artcileNewly synthesized quaternary ammonium bis-cationic surfactant utilized for mitigation of carbon steel acidic corrosion; theoretical and experimental investigations, Application In Synthesis of 143-15-7, the publication is Journal of Molecular Structure (2022), 133063, database is CAplus.

New quaternary ammonium bis-cationic surfactant namely; 4,4′-(((1Z,5Z)-pentane-1,5-diylidene)bis(azaneylylidene))bis(1-dodecyl-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-1-ium bromide) (QABCS) was synthesized and characterized via various spectral techniques. Surface tension measurements were performed for the investigation of surface-active parameters. QABCS’s effectiveness as a corrosion inhibitor for carbon steel (CS) in 1.0 M HCl was evaluated using a variety of techniques. Inhibition potency progresses via rising QABCS dose while decreases with the temperature increasing. QABCS boosts the impedance of CS corrosion via 94.67% at 1 × 10^-3 M. In addition, QABCS adsorption is consistent with Langmuir dsorption isotherm model. QABCS regards a mixed-type inhibitor. The explanation of d.-functional theory (DFT) and Monte Carlo (MC) findings shows that the QABCS compound has a high adsorption potential on CS surface due to active centers in the QABCS’ mol. structure. According to the scanning electron microscope (SEM) and at. force microscope (AFM) findings, QABCS creates a shielding layer over carbon steel substrate. Theor. discussions, as well as SEM and AFM findings, are compatible with laboratory corrosion assessment studies.

Journal of Molecular Structure published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Application In Synthesis of 143-15-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Belthle, Thomke published the artcileNanostructuring the Interior of Stimuli-Responsive Microgels by N-Vinylimidazoles Quaternized with Hydrophobic Alkyl Chains, COA of Formula: C12H25Br, the publication is Macromolecules (Washington, DC, United States) (2022), 55(3), 844-861, database is CAplus.

The functionality of stimuli-responsive microgels can be tailor-made by manipulating their internal nanostructure induced by the chem. composition and morphol. of the polymer network. Microgels with phase-separated domains on a nanoscopic length scale were synthesized by copolymerization of N-vinylcaprolactam (VCL) and amphiphilic-to-hydrophobic 1-vinyl-3-alkylimidazolium (VIM⁺C_nH_2n+1) bromides (Br^–) of different alkyl chain lengths (n = 12, 14, 16) as comonomers. These quaternized imidazoles provide dual functionality for immobilization of payload by electrostatic and hydrophobic interactions. The morphologies and properties of synthesized poly(VCL-co-VIM⁺C_nH_2n+1Br^–) microgels with 10 mol % comonomer were investigated systematically by ¹H and ¹³C high-resolution NMR spectroscopy and relaxometry. Chem. side-selective information about the monomers’ volume-phase transition temperatures, width of transition, and change in transition entropy was reported and correlated to the alkyl chain length of the VIM⁺C_nH_2n+1Br^– comonomer. ¹³C NMR spectroscopy reveals the existence of trans and gauche conformers of alkyl chains, which depends on the alkyl chain length and temperature Morphologies and dynamic contrasts of alkyl chain domains and VCL moieties of poly(VCL-co-VIM⁺C_nH_2n+1Br^–) microgels were investigated by ¹H transverse magnetization relaxation (T₂-relaxation). Finally, the microgels were successfully applied in the uptake of the hydrophobic dye Nile red, proving their ability to solubilize hydrophobic substances. In addition, the poly(VCL-co-VIM⁺C_nH_2n+1Br^–) microgels were utilized in electrostatic interactions, as well as simultaneous addition of hydrophobic and neg. charged payload as a proof of concept for dual functionality. This investigation will allow for a better understanding of the internal nanophase structure of complex poly(N-vinylcaprolactam) (PVCL)-based microgels comprising pH-independent pos. charges, as well as hydrophobic compartments, which have potential application as dual-functional delivery systems.

Macromolecules (Washington, DC, United States) published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, COA of Formula: C12H25Br.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Hammoud, Abdelhay published the artcileStereoselective synthesis of 1-acetoxy-7Z,11E-hexadecadiene or angoulure, the sex pheromone of the angoumois grain moth: Sitotrage cerealella Oliv, Formula: C7H13BrSi, the publication is Bulletin de la Societe Chimique de France (1978), 299-303, database is CAplus.

The title compound (I) was prepared by two methods: one involving a Wittig reaction and the other in which a Claisen-Johnson reaction was employed. Thus, (E)-BuCH:CH(CH₂)₃P⁺Ph₃ Br^– condensed with HCO(CH₂)₅CO₂Et to give (E,E)-BuCH:CHCH₂CH₂CH:CH(CH₂)₆CO₂Et, which was reduced (LiAlH₄) and O-acetylated to give I. The alkylation of (E)-HCCCH₂CH₂CH:CHBu by I(CH₂)₆OCH(OEt)Me yielded (E)-BuCH:CHCH₂CH₂CC(CH₂)₆OH, and O-acetylation and hydrogenation of the product gave I.

Bulletin de la Societe Chimique de France published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Formula: C7H13BrSi.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Lanzi, Matteo published the artcileCyclic Diaryl λ³-Bromanes as Original Aryne Precursors, Name: 2-Bromo-5-methoxybenzene boronic acid, the publication is Angewandte Chemie, International Edition (2021), 60(27), 14852-14857, database is CAplus and MEDLINE.

Despite the widespread application of hypervalent iodines, the corresponding λ³-bromanes are less explored. Herein the authors report a general, safe, and high-yielding strategy to access cyclic diaryl λ³-bromanes. These unique compounds feature reactivity that is appealing and complementary to that of λ³-iodanes, generating arynes under mild reaction conditions and in the presence of a weak base. Accordingly, formal meta-selective transition-metal-free C-O and C-N couplings may be achieved. Mechanistic studies unambiguously support the aryne generation mechanism.

Angewandte Chemie, International Edition published new progress about 89694-44-0. 89694-44-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronic Acids,Boronic acid and ester, name is 2-Bromo-5-methoxybenzene boronic acid, and the molecular formula is C7H8BBrO3, Name: 2-Bromo-5-methoxybenzene boronic acid.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Tsagdi, A. published the artcileBlend membranes based on N1-alkyl-substituted imidazolium functionalized polymers and aromatic polyethers: influence of N1-alkyl substituent on properties and alkaline stability, Category: bromides-buliding-blocks, the publication is Polymer Bulletin (Heidelberg, Germany) (2022), 79(3), 1647-1668, database is CAplus.

N1-alkyl (octyl and dodecyl)-substituted imidazolium-based PVBC homopolymers have been synthesized via N-quaternization reaction of N1-alkyl imidazole and PVBC precursor homopolymer bearing reactive benzyl chloride moieties. Due to their poor film forming properties and water solubility, these homopolymers were blended with aromatic polyethers bearing main chain pyridine units at different compositions in order to study the effect of alkyl chain length on morphol., water uptake, swelling ability and chem. stability of the prepared membranes. The B2 blend membrane with the highest N1-dodecyl-substituted imidazolium PVBC content (65 wt%) exhibited the highest water uptake (54%) despite its lower IEC value compared to the corresponding one containing N1-octyl-substituted imidazolium PVBC, low swelling ratio and a phase separated morphol. Evaluation of the chem. stability in 3.6 M KOH solution at 80°C for 7 days revealed the degradation of imidazolium via ring opening, as evidenced by ATR-FT-IR spectroscopy. Therefore, new blends having as second constituent, the N1-alkyl-substituted imidazolium functionalized poly(PVBC-co-AA₂₀) copolymers containing acrylic acid units were fabricated targeting to the improvement of chem. stability via ionic cross linking. The prepared D1 and D2 blend membranes containing 60 and 65 wt% dodecyl-imidazolium functionalized poly(PVBC-co-AA₂₀) copolymer content, resp., were flexible, exhibited moderate IECs (1.47-1.60 meq/g) and sufficient water uptakes (up to 30%). D2 blend membrane showed excellent chem. stability after testing in 3.6 M KOH solution at 80°C for 30 days, as confirmed by ATR-FT-IR spectroscopy and TGA anal. The excellent chem. stability can probably be attributed to the steric hindrance effect of N1 dodecyl substituent which effectively protects the C2 position of imidazolium from hydroxide attack as well as to the formation of a dense, ionic crosslinked structure that hinders hydroxide penetration.

Polymer Bulletin (Heidelberg, Germany) published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C6H12O2, Category: bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary