Author: Jessica.F

Braun, Aleksander published the artcileQuantitative determination of cationic surfactants by two-phase titration, SDS of cas: 518-67-2, the publication is Biuletyn Informacyiny: Barwniki, Srodki Pomocnicze (1981), 25(3), 73-6, database is CAplus.

Better reproducibility of the results was obtained in two-phase (H₂O-CHCl₃) titration of cationic surfactants (octadecyltrimethylammonium chloride  [112-03-8], etc.) with solution of lauryl sodium sulfate  [151-21-3] in the presence of mixed indicator Disulfine Blue VN150  [129-17-9]–Dimidium bromide  [518-67-2] than in the presence of methylene blue  [61-73-4]. The mechanism of color change and exptl. procedure were discussed.

Biuletyn Informacyiny: Barwniki, Srodki Pomocnicze published new progress about 518-67-2. 518-67-2 belongs to bromides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Benzene, name is Dimidium bromide, and the molecular formula is C20H18BrN3, SDS of cas: 518-67-2.

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

Doerr, Alicia M. published the artcileRedox Potential as a Predictor of Polyethylene Branching Using Nickel α-Diimine Catalysts, Computed Properties of 111865-47-5, the publication is ACS Catalysis (2022), 12(1), 73-81, database is CAplus.

The ability to control polyethylene branching d. is of great interest as a means by which a polymer’s thermomech. properties may be tailored. One particularly interesting way in which this can be achieved is by altering the electronic characteristics of Pd- and Ni-based α-diimine catalysts through the inclusion of electron-withdrawing or electron-donating substituents onto the ligand scaffold; however, a few critical fundamental studies are absent from the literature. These include a systematic examination of electronic perturbations of Ni-based α-diimine catalysts, as well as how placement of donating or withdrawing substituents on the backbone vs. N-aryl moieties of the α-diimine ligand framework impact polymer topol. In addition, no method currently exists by which the polymer topol. may be predicted based on an intrinsic characteristic of the (pre)catalyst or ligand without requiring extensive polymerization studies. Herein, the authors use both exptl. and computational methods to understand how the placement of electron-donating or electron-withdrawing substituents on Ni α-diimine catalysts affects PE branching d., and compare those results to the analogous unsubstituted catalyst. Inclusion of electron-withdrawing substituents decreases resultant PE branching d., whereas electron-donating substituents exhibit little to no change in PE branching d. Finally, as the placement and identity of donating or withdrawing substituents are varied, so too is the redox half-wave potential (E_1/2) of the precatalysts, which can be used to generate a predictive curve by which PE branching d. may be estimated for other substituted Ni-based α-diimine catalysts without the need for extensive polymerization studies.

ACS Catalysis published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Computed Properties of 111865-47-5.

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

Lemouzy, Sebastien published the artcileUnderstanding the Reshaping of Fluorinated Polyester Vitrimers by Kinetic and DFT Studies of the Transesterification Reaction, Application In Synthesis of 401-55-8, the publication is Chemistry – A European Journal, database is CAplus and MEDLINE.

Vitrimers are a third class of polymers gathering the mech. properties and solvent resistance of 3D thermosets and the reprocessability of thermoplastics. This unique behavior is due to the triggering of certain covalent exchange reactions that allow the network to rearrange upon application of a stimulus. The constitutive feature of vitrimers is the adoption of a glass-like viscosity during the rearrangement of the network, often due to an associative mechanism for the exchange reaction. Transesterification networks are one of the most studied type of vitrimers that usually require the incorporation of a catalyst, implying the associated drawbacks. Following up on a recent report on catalyst-free transesterification vitrimers in which the ester functions are particularly reactive thanks to the presence of fluorine atoms in α- or β-position, parallel DFT calculations and an exptl. kinetic study on model mols. are presented in order to quant. assess the effect of neighboring fluorinated groups on the transesterification reaction rate.

Chemistry – A European Journal published new progress about 401-55-8. 401-55-8 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Aliphatic hydrocarbon chain,Ester, name is Ethylbromofluoroacetate, and the molecular formula is C4H6BrFO2, Application In Synthesis of 401-55-8.

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

Anderson, Trent E. published the artcilePoly(2,3-dihexylthieno[3,4- b ]pyrazine- alt -2,3-dihexylquinoxaline): Processible, Low-Bandgap, Ambipolar-Acceptor Frameworks via Direct Arylation Polymerization, Formula: C4Br2N2O4S, the publication is Synlett (2018), 29(19), 2542-2546, database is CAplus.

The synthesis of a new dialkyl-functionalized quinoxaline acceptor, 5,8-dibromo-2,3-dihexylquinoxaline, is reported, along with its cross-coupling with 2,3-dihexylthieno[3,4- b]pyrazine via direct arylation polymerization The resulting ambipolar-acceptor polymer poly(2,3-dihexylthieno[3,4- b]pyrazine- alt-2,3-dihexylquinoxaline) exhibits a low bandgap of 1.07 eV and high solubility The results of initial organic photovoltaic devices are also reported.

Synlett published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Formula: C4Br2N2O4S.

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

Rosso, Cristian published the artcileUnveiling the Synthetic Potential of Substituted Phenols as Fully Recyclable Organophotoredox Catalysts for the Iodosulfonylation of Olefins, Computed Properties of 111-83-1, the publication is ACS Catalysis (2022), 12(8), 4290-4295, database is CAplus.

An efficient photocatalytic procedure for the direct iodosulfonylation of terminal olefins RCHCH₂ (R = Bu, cyclohexylmethyl, 4-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)butyl, etc.) with α-iodo phenylsulfones R¹S(O)₂CH(R²)I (R¹ = Me, Ph, cyclohexyl, naphthalene-1-yl, etc.; R² = H, Me) was described. Specifically, the process uses the simple, robust, and fully recyclable phenol derivative I as the precatalytic system and occurs with visible-light irradiation (450 nm). Mechanistic investigations proved the key role of the in situ generated photocatalyst, namely phenolate anion, which has shown high catalytic activity and considerable stability toward the operating conditions. Importantly, this photocatalytic transformation provides a wide variety of densely functionalized alkyl iodides RCH(I)CH₂CH(R²)S(O)₂R¹ (23 examples, up to 95% yield). Finally, the synthetic potential of this photochem. transformation was demonstrated by scaling up the process under microfluidic conditions (up to 0.67 mmol h^-1) while accessing a series of relevant product manipulations.

ACS Catalysis published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C8H17Br, Computed Properties of 111-83-1.

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

Page, Brent D. G. published the artcileInhibiting Aberrant Signal Transducer and Activator of Transcription Protein Activation with Tetrapodal, Small Molecule Src Homology 2 Domain Binders: Promising Agents against Multiple Myeloma, Quality Control of 21101-63-3, the publication is Journal of Medicinal Chemistry (2013), 56(18), 7190-7200, database is CAplus and MEDLINE.

[(Arylsulfonyl)glycinyl](cyclohexylbenzyl)aminosalicylic acids such as I (R = 4-MeC₆H₄, F₅C₆; R¹ = 2-F₃CC₆H₄) were prepared as inhibitors of the signal transducer and activator of transcription (STAT) protein Stat3 for potential use as treatments for multiple myeloma. The hydrophobicities of I and their inhibition of Stat3 were determined; mol. docking of selected compounds to the SH2 domain of Stat3 and inhibition of Stat3 phosphorylation under various conditions were determined for selected compounds, and the activity of I (R = 4-MeC₆H₄; R¹ = 2-F₃CC₆H₄) against human multiple myeloma cells and human hematopoietic cells and its induction of apoptosis in multiple myeloma cells was determined

Journal of Medicinal Chemistry published new progress about 21101-63-3. 21101-63-3 belongs to bromides-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Bromide,sulfides,Benzyl bromide,Benzene, name is (4-(Bromomethyl)phenyl)(trifluoromethyl)sulfane, and the molecular formula is C8H6BrF3S, Quality Control of 21101-63-3.

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

Kropp, Paul J. published the artcileSurface-Mediated Reactions. 4. Hydrohalogenation of Alkynes, COA of Formula: C6H12Br2, the publication is Journal of Organic Chemistry (1994), 59(11), 3102-12, database is CAplus.

The use of appropriately prepared silica gel and alumina has been found to mediate the addition of hydrogen halides to alkynes. The technique has been rendered even more convenient by the use of various organic and inorganic acid halides that react in the presence of silica gel or alumina to generate hydrogen halides in situ. Treatment in this fashion of 1-propynylbenzene (1), which underwent no reaction in CH₂Cl₂ solution saturated with HCl, readily afforded the syn addition product alkenyl chloride (E)-PhCX:CHMe, [(E)-4, X = Cl]. On extended treatment (E)-4 (X = Cl) underwent subsequent isomerization to the thermodynamically more stable Z isomer. In a similar way bromides (E)- and (Z)-4 (X = Br) were obtained without competing formation of the radical products (E)- and (Z)-PhCH:CMeBr, which occurred in solution In contrast with slow solution-phase hydriodination of alkyne 1, surface-mediated addition readily afforded (E)-4 (X = I), followed by isomerization to the Z isomer. Equilibration E ⇌ Z of the alkenyl halides 4 was shown to involve, at least in part, addition-elimination via the gem-dihalides PhCX₂Et. Analogous behavior was exhibited by the phenylalkynes PhCCPh and PhCCCMe₃ on surface-mediated hydrohalogenation. Surface-mediated addition of HBr and HI to the internal alkylalkyne PrCCPr afforded principally the anti addition products (Z)-PrCX:CHPr. Treatment of the terminal alkynes BuCH₂CCH and Me₃CCCH with (COBr)₂ over alumina gave the dibromides, whereas use of acetyl bromide as the HBr precursor afforded the alkenyl bromides.

Journal of Organic Chemistry 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 C6H12Br2, COA of Formula: C6H12Br2.

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

Bricaud, Quentin published the artcileTerthiophene-cyanovinylene π-conjugated polymers as donor material for organic solar cells, HPLC of Formula: 303734-52-3, the publication is Synthetic Metals (2009), 159(23-24), 2534-2538, database is CAplus.

Conjugated polymers of hybrid structure containing cyanovinylene linkages have been synthesized by Knoevenagel condensation of diformyl terthienyls with para-dicyanomethylbenzene. UV-vis and cyclic voltammetric data show that these polymers combine reduced band gap, improved light-harvesting properties and low lying HOMO level. Whereas the very low solubility of the polymers did not allow the fabrication of bulk heterojunction solar cells, bilayer heterojunction solar cells have been realized using thermally evaporated films of fullerene C₆₀ as acceptor material. The best devices show a maximum external quantum efficiency of ∼20% and a power conversion efficiency of 0.40% under simulated AM 1.5 solar illumination.

Synthetic Metals published new progress about 303734-52-3. 303734-52-3 belongs to bromides-buliding-blocks, auxiliary class Thiophene,Bromide, name is 2-Bromo-3-(2-ethylhexyl)thiophene, and the molecular formula is C12H19BrS, HPLC of Formula: 303734-52-3.

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

Mathew, Sanyo published the artcileEnhanced Helical Folding of ortho-Phenylenes through the Control of Aromatic Stacking Interactions, Recommanded Product: 2-Bromo-5-methoxybenzene boronic acid, the publication is Journal of the American Chemical Society (2014), 136(47), 16666-16675, database is CAplus and MEDLINE.

The ortho-phenylenes are a simple class of foldamers, with the formation of helixes driven by offset aromatic stacking interactions parallel to the helical axis. For the majority of reported o-phenylene oligomers, the perfectly folded conformer comprises perhaps 50-75% of the total population. Given the hundreds or thousands of possible conformers for even short oligomers, this distribution represents a substantial bias toward the folded state. However, “next-generation” o-phenylenes with better folding properties are needed if these structures are to be exploited as functional units within more complex architectures. Here, we report several new series of o-phenylene oligomers, varying both the nature and orientation of the substituents on every repeat unit. The conformational behavior was probed using a combination of NMR spectroscopy, DFT calculations, and X-ray crystallog. We find that increasing the electron-withdrawing character of the substituents gives oligomers with substantially improved folding properties. With moderately electron-withdrawing groups (acetoxy), we observe >90% of the perfectly folded conformer, and stronger electron withdrawing groups (triflate, cyano) give oligomers for which misfolded states are undetectable by NMR. The folding of these oligomers is only weakly solvent-dependent. General guidelines for the assessment of o-phenylene folding by NMR and UV-vis spectroscopy are also discussed.

Journal of the American Chemical Society 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, Recommanded Product: 2-Bromo-5-methoxybenzene boronic acid.

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

Booker-Milburn, Kevin I. published the artcileFe(III)/Cu(II) mediated 5- and 6-exo oxidative ring-expansion/cyclisation of cyclopropyl ethers: studies towards dictyol C and α-eudesmol, COA of Formula: C7H13BrSi, the publication is Tetrahedron Letters (2000), 41(23), 4651-4655, database is CAplus.

The outcome of oxidative ring-expansion/cyclization of cyclopropanes with a mixed Fe(III)/Cu(II) system was found to be dependent on the mode of cyclization. When 6-exo cyclization was attempted, unusual products resulting from oxidation of ring-opened primary radicals were obtained.

Tetrahedron Letters 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, COA of Formula: C7H13BrSi.

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