Author: Jessica.F

Grosse, Aristid V. published the artcileThe alkylation of paraffins with olefins. The identification of the paraffins formed, Synthetic Route of 594-81-0, the publication is Journal of Organic Chemistry (1943), 438-47, database is CAplus.

The hexanes obtained by the reaction between Me₃CH and CH₂:CH₂ with BF₃ or AlCl₃ as catalyst are investigated and identified by converting them into Br and NO₂ derivatives and by the Raman spectrum. The hexane fractions consist chiefly of 90-70% Me₂CHCHMe₂ (I), 10-25% Me₂CHPr (II) and of less than 3% Me₃CEt (III). ETCHMeEt and n-hexane cannot be detected and may be present only in traces, if at all. Since I is the only hexane which gives a solid Br derivative on direct bromination, the hexane fraction is brominated in direct sunlight, giving Me₂CBr CBrMe₂ (IV). IV sublimes 165-75° without melting and m. 166-8° (decomposition) in a sealed tube. On further bromination, IV gives Me(BrCH₂)CBrCBr(CH₂Br)Me, m. 130-1°. When boiled with Zn in 95% EtOH, IV gives Me₂C:CMe₂, b₇₆₀ 72°, n²⁰_D 1.4155, which is converted by Thiele’s method (Ber. 27, 456(1894)) into Me₂C(NO)CClMe₂, m. 121°. Me₂CBrCHMe₂ (V), m. 24-5°, and Me₃CCBr₂Me, m. 191.5°, are not formed by direct bromination. The liquid bromides left after the separation of IV consist chiefly of monobromides, b₂₀₀ 75-85°, n²⁰_D 1.45, which are free from V. Nitration of the hexane fraction by boiling 20 cc. with 60 cc. 38% HNO₃ for 6 hrs. gives Me₂C(NO₂)C(NO₂)₂Et, colorless plates or needles, m. 96°, indicating the presence of II in the hexane mixture The presence of III was first observed when a fraction, b₇₆₀ 49.2-9.9°, d²⁰₄ 0.6492, n²⁰_D 1.3689, was obtained. Treatment of this fraction with 38% HNO₃ at 120° and distillation give 3-nitro-2,2-dimethylbutane, b₇₆₀ 168°. It dissolves completely in 5% EtONa in EtOH, remains in solution on addition of an equal volume of H₂O and is precipitated from this solution by CO₂ as an oil. For the results of the Raman spectrum, see C. A. 34, 3205.2. The reactions taking place between Me₃CH and CH₂:CH₂ in the presence of catalysts are briefly discussed.

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, Synthetic Route of 594-81-0.

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

Tsuchiya, Motoki published the artcileSynthesis of Twisted Anthracenes: Induction of Twist Chirality by the Planar Chiral [2.2]Paracyclophane, COA of Formula: C12H25Br, the publication is Chemistry – An Asian Journal (2022), 17(15), e202200418, database is CAplus and MEDLINE.

Planar chiral [2.2]paracyclophane was employed as chiral scaffolds to twist an anthracene ring by tethering at its 1- and 8-positions; thus, twist chirality was induced in the anthracene moiety. The chiroptical properties of the resulting mol. I, including CD (CD) and circularly polarized luminescence (CPL), were found to be derived from the twist chirality. An analogous mol. II bearing long alkyl chains was a viscous liquid at ambient temperature, and its liquid film exhibited good CD and CPL profiles. Theor. studies were carried out to determine the origin of these properties in the ground and excited states, which reproduced well the exptl. results.

Chemistry – An Asian Journal 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 C8H6ClN, COA of Formula: C12H25Br.

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

Ito, Akihiro published the artcileFacile Synthesis, Crystal Structures, and High-Spin Cationic States of All-para-Brominated Oligo(N-phenyl-m-aniline)s, Related Products of bromides-buliding-blocks, the publication is Journal of Organic Chemistry (2002), 67(2), 491-498, database is CAplus and MEDLINE.

Syntheses of brominated oligoanilines I and II were achieved in a one-pot procedure from the parent nonbrominated oligomers and benzyltrimethylammonium tribromide [(BTMA)Br₃]. An X-ray crystallog. anal. revealed that II has a U-shaped structure, suggesting that the analogous polymer easily adopts helical structures. Furthermore, the redox properties were investigated by the UV-vis and EPR measurements. It was confirmed that the both I and II can be oxidized into the dications I²⁺ and II²⁺ with triplet spin-multiplicity.

Journal of Organic Chemistry 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, Related Products of bromides-buliding-blocks.

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

Shames, Alexander I. published the artcileAssessing the outdoor photochemical stability of conjugated polymers by EPR spectroscopy, Quality Control of 303734-52-3, the publication is Journal of Materials Chemistry A: Materials for Energy and Sustainability (2016), 4(34), 13166-13170, database is CAplus.

We report the first outdoor study of the intrinsic photochem. stability of a series of conjugated polymers encapsulated in an inert atm. and exposed to natural sunlight illumination conditions in the Negev Desert. The photoinduced aging effects resulting in the modification of the chem. structures of the materials and the appearance of persistent radical species in the samples were revealed by EPR spectroscopy. Comparing the degradation profiles normalized to the total number of absorbed photons allowed us to establish some correlations between the chem. structures of polymers (and even particular building blocks) and their photostability. Our approach may be widely used for the facile screening of many existing conjugated polymers with respect to their intrinsic photostability under outdoor solar conditions as well as for the elaboration of guidelines for designing novel promising materials for stable and efficient organic photovoltaics.

Journal of Materials Chemistry A: Materials for Energy and Sustainability 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 C14H22O2, Quality Control of 303734-52-3.

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

Arno, Maria C. published the artcileExploiting the role of nanoparticle shape in enhancing hydrogel adhesive and mechanical properties, Computed Properties of 55788-44-8, the publication is Nature Communications (2020), 11(1), 1420, database is CAplus and MEDLINE.

The ability to control nanostructure shape and dimensions presents opportunities to design materials in which their macroscopic properties are dependent upon the nature of the nanoparticle. Although particle morphol. has been recognized as a crucial parameter, the exploitation of the potential shape-dependent properties has, to date, been limited. Herein, we demonstrate that nanoparticle shape is a critical consideration in the determination of nanocomposite hydrogel properties. Using translationally relevant calcium-alginate hydrogels, we show that the use of poly(L-lactide)-based nanoparticles with platelet morphol. as an adhesive results in a significant enhancement of adhesion over nanoparticle glues comprised of spherical or cylindrical micelles. Furthermore, gel nanocomposites containing platelets showed an enhanced resistance to breaking under strain compared to their spherical and cylindrical counterparts. This study opens the doors to a change in direction in the field of gel nanocomposites, where nanoparticle shape plays an important role in tuning mech. properties.

Nature Communications published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Computed Properties of 55788-44-8.

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

Alghamdi, Abdulaziz Ali B. published the artcileSynthesis and characterization of novel thiophene and carbazole-based polymers – optical and electrochemical characterization, Computed Properties of 52431-30-8, the publication is International Journal of Electrochemical Science (2016), 11(6), 5111-5127, database is CAplus.

A donor/acceptor series of carbazole copolymers, composed of alternating 2,7-linked 3,6-difluoro-9-(1-octyl-nonyl)-carbazole units and bithiophene repeated units [P1], 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy) phenyl) thieno[3,4-b]pyrazine repeated units [P2] and bithiophene mixed with 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy) phenyl) thieno[3,4-b]pyrazine repeated units [P3] have been prepared following Suzuki polymerization procedures. The route of synthesis and characterization techniques of this novel class of materials, together with their photophys. and electrochem. properties are presented in this study. The polymers were characterized by 1H NMR, 13C NMR and Elemental Anal. Mol. weights were estimated using gel permeation chromatog. (GPC). The thermal stability behavior for polymers was investigated using thermogravimetric anal. (TGA) and differential scanning calorimetry (DSC). The electronic and photo-phys. properties were investigated by use of cyclic voltammetry (CV) and UV-Vis spectroscopy, resp.

International Journal of Electrochemical Science 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, Computed Properties of 52431-30-8.

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

Iwamoto, Hiroaki published the artcileComputational design of high-performance ligand for enantioselective Markovnikov hydroboration of aliphatic terminal alkenes, Computed Properties of 76283-09-5, the publication is Nature Communications (2018), 9(1), 1-10, database is CAplus.

Finding optimal chiral ligands for transition-metal-catalyzed asym. reactions using trial-and-error methods is often time-consuming and costly, even if the details of the reaction mechanism are already known. Although modern computational analyses allow the prediction of the stereoselectivity, there are only very few examples for the attempted design of chiral ligands using a computational approach for the improvement of the stereoselectivity. Herein, authors report a systematic method for the design of chiral ligands for the enantioselective Markovnikov hydroboration of aliphatic terminal alkenes based on a computational and exptl. evaluation sequence. Authors also developed a three-hindered-quadrant P-chirogenic bisphosphine ligand that was designed in accordance with the design guidelines derived from this method, which allowed the Markovnikov hydroboration to proceed with high enantioselectivity (up to 99% ee).

Nature Communications published new progress about 76283-09-5. 76283-09-5 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Benzyl bromide,Benzene, name is 4-Bromo-1-(bromomethyl)-2-fluorobenzene, and the molecular formula is C7H5Br2F, Computed Properties of 76283-09-5.

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

Matsunaga, Yoichiro published the artcileReactions of 3-isopropenyl- and 3-acetyltropolone with quaternary ammonium tribromides, Related Products of bromides-buliding-blocks, the publication is Bulletin of the Chemical Society of Japan (1992), 65(1), 295-7, database is CAplus.

Treatments of 3-isopropenyltropolone (I) with quaternary ammonium tribromides in THF afforded 3-methyl-8H-cyclohepta[b]furan-8-one (II). The reactions in methanol-dichloromethane gave 7-bromo-3-methyl-8H-cyclohepta[b]furan-8-one. Bromination of 3-acetyltropolone with the tribromides in THF produced 3-(bromoacetyl)tropolone, whereas the reaction in the methanolic solvent gave 7-bromo- and 5,7-dibromo-substituted 3-acetyltropolones. The brominations of 4′-hydroxyacetophenone were also carried out.

Bulletin of the Chemical Society of Japan 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, Related Products of bromides-buliding-blocks.

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

Doba, Takahiro published the artcileIron-catalysed regioselective thienyl C-H/C-H coupling, Computed Properties of 303734-52-3, the publication is Nature Catalysis (2021), 4(7), 631-638, database is CAplus.

Regioselective thienyl-thienyl coupling is arguably one of the most important transformations for organic electronic materials. A prototype of ideal organic synthesis to couple two thienyl groups by cutting two C-H bonds requires formal removal of two hydrogen atoms with an oxidant, which often limits the synthetic efficiency and versatility for oxidation-sensitive substrates (for example, donor and hole-transporting materials). Here, we found that di-Et oxalate, used together with AlMe3, acts as a two-electron acceptor in an iron-catalyzed C-H activation. We describe the regioselective thienyl C-H/C-H coupling with an iron(III) catalyst, a trisphosphine ligand, AlMe3 and di-Et oxalate under mild conditions. The efficient catalytic system accelerated by ligand optimization polymerizes thiophene-containing monomers into homo- and copolymers bearing a variety of electron-donative π motifs. The findings suggest the versatility of iron catalysis for the synthesis of functional polymers, for which the potential of this ubiquitous metal has so far not been fully appreciated.

Nature Catalysis 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, Computed Properties of 303734-52-3.

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

Liu, Juncheng published the artcileInvestigation on the solubilization of organic dyes and micro-polarity in AOT water-in-CO₂ microemulsions with fluorinated co-surfactant by using UV-Vis spectroscopy, SDS of cas: 518-67-2, the publication is Journal of Supercritical Fluids (2004), 32(1-3), 97-103, database is CAplus.

It was found that the dyes thymol blue, dimidium bromide, and methyl orange, which are not soluble in pure supercritical CO₂, could be conveniently solubilized in AOT water-in-CO₂ reverse microemulsions with 2,2,3,3,4,4,5,5-octafluoro-1-pentanol as co-surfactant. The solubilities of the dyes in the microemulsions were measured successfully by using a UV-visible spectroscopy method newly established in our laboratory; besides that, for a given temperature, a critical micelle pressure at which formation of AOT water-in-CO₂ reverse micelles starts, was determined in term of the effect of pressure on the absorption intensity of the dyes in the microemulsions. Furthermore, the micro-polarity environment of the AOT water-in-CO₂ reverse microemulsions was investigated systematically according to the shift of the solvatochromic probes methyl orange and dimidium bromide with varying water content by using UV-visible spectroscopy.

Journal of Supercritical Fluids 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