Month: November 2022

Jenkins, T. E. published the artcileThe Raman spectrum of 2,3-dibromo-2,3-dimethylbutane between 15 K and room temperature, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (1980), 36A(5), 491-4, database is CAplus.

The Raman spectrum of (BrCMe₂)₂ was determined at 15-300 K. A gauche conformer is present at room temperature A phase transition was observed at 185 K. Another orientational phase transition at ∼77 K was discussed.

Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy 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, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

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

Diemer, Vincent published the artcileEfficient and Complementary Methods Offering Access to Synthetically Valuable 1,2-Dibromobenzenes, Quality Control of 1075719-78-6, the publication is European Journal of Organic Chemistry (2011), 327-340, S327/1-S327/51, database is CAplus.

1,2-Dibromobenzenes are highly valuable precursors for various organic transformations, in particular, reactions based on the intermediate formation of benzynes. This report describes short sequences for the synthesis of various derivatives based on regioselective bromination, ortho-metalation, and halogen/metal permutations. 1,2-Dibromo-3-iodobenzene, 1,2-dibromo-4-iodobenzene, and 2,3-dibromo-1,4-diiodobenzene act as intermediates in these syntheses.

European Journal of Organic Chemistry published new progress about 1075719-78-6. 1075719-78-6 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-(3,4-Dibromophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C12H15BBr2O2, Quality Control of 1075719-78-6.

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

Lenstra, Danny C. published the artcileSustainable organophosphorus-catalysed Staudinger reduction, SDS of cas: 147181-08-6, the publication is Green Chemistry (2018), 20(19), 4418-4422, database is CAplus.

A highly efficient and sustainable catalytic Staudinger reduction for the conversion of organic azides to amines in excellent yields was developed. The reaction displayed excellent functional group tolerance to functionalities that were otherwise prone to reduction, such as sulfones, esters, amides, ketones, nitriles, alkenes and benzyl ethers. The green nature of the reaction was exemplified by the use of PMHS, CPME and a lack of column chromatog.

Green Chemistry published new progress about 147181-08-6. 147181-08-6 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Salt,Amine,Benzene, name is (4-Bromo-2-fluorophenyl)methanamine hydrochloride, and the molecular formula is C7H8BrClFN, SDS of cas: 147181-08-6.

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

Gruetzmacher, Hans F. published the artcileMass spectrometry of unstable organic molecules. IX. Evidence for isomeric dehydronaphthalenes from pyrolysis-mass spectrometry, Application of 1,3-Dibromonaphthalene, the publication is Justus Liebigs Annalen der Chemie (1975), 2023-32, database is CAplus.

Thermal fragmentations of substituted naphthalenes (e.g. I; R,R1 = Br; R,R1 = NO2, R = NO2, R1 = iodo; II; R,R1 = Br; R,R1 = NO2) were examined via pyrolysis mass spectrometry. 1,4- And 1,3-disubstituted naphthalenes produce o-diethynylbenzene (ionization potential = 8.96 ± 0.05 eV); the other disubstituted naphthalenes produce dehydronaphthalenes. The ionization potentials of the dehydronaphthalenes were determined

Justus Liebigs Annalen der Chemie published new progress about 52358-73-3. 52358-73-3 belongs to bromides-buliding-blocks, auxiliary class Bromide,Naphthalene, name is 1,3-Dibromonaphthalene, and the molecular formula is C10H6Br2, Application of 1,3-Dibromonaphthalene.

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

Zoombelt, Arjan P. published the artcileThe influence of side chains on solubility and photovoltaic performance of dithiophene-thienopyrazine small band gap copolymers, Category: bromides-buliding-blocks, the publication is Polymer (2009), 50(19), 4564-4570, database is CAplus.

Three small band gap copolymers based on alternating dithiophene and thienopyrazine units were synthesized via Yamamoto coupling and applied in bulk heterojunction solar cells as donor together with PCBM ([6,6]-Ph C₆₁ butyric acid Me ester) as acceptor. The polymers have an optical band gap of ∼1.3 eV in the solid state and only vary by the chem. nature of the solubilizing side chains. The nature of the side chain has a major effect on solubility and processability of the polymer. Using n-butoxymethyl side chains a soluble, easy to process polymer was obtained that gave the best photovoltaic performance. With short-circuit currents up to 5.2 mA/cm² an efficiency of 0.8% was achieved under estimated standard solar light conditions (air-mass 1.5G, 100 mW/cm²) with spectral response up to 950 nm.

Polymer 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 C37H30ClIrOP2, Category: bromides-buliding-blocks.

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

Kim, Na Young published the artcileEnhanced doping efficiency and thermoelectric performance of diketopyrrolopyrrole-based conjugated polymers with extended thiophene donors, Computed Properties of 303734-52-3, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2021), 9(1), 340-347, database is CAplus.

The design of polymer backbones suitable for improving doping efficiency can provide a new direction in enhancing charge transport and thermoelec. performance. However, their optimizations are still unclear. Herein, the synthesis of a new diketopyrrolopyrrole (DPP)-based conjugated polymer with eight thiophene groups in a repeat unit, EHT6-20DPP, was reported for the improvement of thermoelec. properties. Compared to other DPP-based polymers with a different number of thiophene groups, EHT6-20DPP exhibits higher doping efficiency when doped with a p-type dopant, FeCl₃, owing to its higher number of thiophene groups as electron donating units. The optimum elec. conductivity and power factor of the doped EHT6-20DPP were found to be 93.28 S cm^-1 and 56.73μW m^-1 K^-2, which are higher than the reference DPP-based polymer with three thiophene groups in a repeat unit. The relationship between the thermoelec. properties is demonstrated using a charge transport model, suggesting that doped EHT6-20DPP has good charge transport properties in terms of polymer backbone engineering. The results of the present work could provide insights into the optimal polymer backbone design for excellent thermoelec. properties.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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

Cho, Yongjoon published the artcileDithienogermole-Based Nonfullerene Acceptors: Roles of the Side-Chains′ Direction and Development of Green-Tinted Efficient Semitransparent Organic Solar Cells, Safety of 2-Bromo-3-(2-ethylhexyl)thiophene, the publication is ACS Applied Energy Materials (2020), 3(8), 7689-7698, database is CAplus.

Inspired by the encouraging properties of Ge-fused heterocyclic dithienogermole (DTG) in optoelectronic applications, we here report two narrow-bandgap acceptor-donor′-donor-donor′-acceptor (A-D′-D-D′-A)-type isomeric nonfullerene acceptors based on DTG (DTG-IW with inward-facing side chains vs DTG-OW with outward-facing side chains) for use in organic solar cells (OSCs). The introduction of the inward-facing side chains into the backbone results in extremely confined face-on crystallites in the solid state, as verified by grazing-incidence wide-angle X-ray scattering measurements. This result is attributed mainly to a better power conversion efficiency (PCE) of 9.16% in the OSC based on a blend of DTG-IW with a narrow-bandgap PTB7-Th donor polymer, as compared with the corresponding DTG-OW-based one. Furthermore, the appealing feature of the blend mixing of the narrow-bandgap donor and acceptor pair is that it enables the construction of a green-tinted efficient semitransparent OSC with a PCE of 6.19% and transmittance of 50.4% in the green wavelength region through incorporation of the recently formulated semitransparent Ag/Sb₂O₃/Ag electrode. Overall, in addition to providing useful perspectives into the side-chain engineering of nonfullerene acceptors, this work highlights that OSC based on the A-D′-D-D′-A-type DTG is a promising narrow-bandgap acceptor for further improvement of the performance of semitransparent OSCs.

ACS Applied Energy Materials 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, Safety of 2-Bromo-3-(2-ethylhexyl)thiophene.

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

Wang, Huan published the artcileSynthesis and Evaluation of 1,2,4-Triazolo[1,5-a]pyrimidines as Antibacterial Agents Against Enterococcus faecium, HPLC of Formula: 21101-63-3, the publication is Journal of Medicinal Chemistry (2015), 58(10), 4194-4203, database is CAplus and MEDLINE.

Rapid emergence of antibiotic resistance is one of the most challenging global public health concerns. In particular, vancomycin-resistant Enterococcus faecium infections have been increasing in frequency, representing 25% of enterococci infections in intensive care units. A novel class of 1,2,4-triazolo[1,5-a]pyrimidines, e.g., I [R¹ = C₆H₄R’, 2-thienyl, 3-thienyl, 2-furyl, 2-pyrrolyl, 2-imiazolyl, 3-indolyl, 3-pyridyl, 2-methoxy-3-pyridyl, 4-pyridyl, cyclohexyl; R’ = i-Pr-4, H, Me-4, Et-4, i-Bu-4, OH-4, OMe-4, OH-3-OMe-4, (OMe)₂-3,4, O(Pr-i)-4, OCF₃-4, SMe-4, etc.], II [R¹ = C₆H₄NMe₂-4, R² = OEt,NHMe, R³ = SCH₂Ph; R¹ = 2-thienyl, R² = OEt, R³ = SCH₂C₆H₄CO₂H-4], III [R¹ = C₆H₄NMe₂-4, R³ = SCH₂Ph; R¹ = C₆H₄OMe-4, C₆H₄OEt-2, R³ = SCH₂C₆H₄CO₂H-4; R¹ = C₆H₃(OMe)₂-3,4, R³ = CH₂C₆H₄F-4; R¹ = C₆H₄Cl-4, R³ = SCH₂-(2-naphthyl)],. IV [R¹ = C₆H₄NMe₂-4, R² = H, R³ = SCH₂Ph; R¹ = C₆H₄Me-4, R² = H, R³ = SCH₂C₆H₄Me-2; R¹ = C₆H₄Me-4, R² = Me-2, Me₂-2,4, R³ = SCH₂C₆H₄Me-3; R¹ = C₆H₄Et-4, R² = H, Me-2, R³ = SCH₂C₆H₄OMe-3; etc.], V [R³ = H, NH₂, CO₂Me, CO₂Et, SMe, SCH₂CONH₂, SCH₂CO₂Et, SCH₂CH₂NHCO₂CH₂Ph, SCH₂-(4-pyridyl), S(2-pyridyl), SCH₂C₆H₄R”-4; R” = Me, OMe, SMe, CF₃, OCF₃, SCF₃, NO₂, CN, CO₂H, CO₂Me] and VI [R¹ = 2-thienyl, R³ = H; R¹ = C₆H₄CHMe₂-4, C₆H₄CO₂H-4, R³ = SCH₂CH₂NHCO₂CH₂Ph], active against E. faecium is reported herein. We used a three-component Biginelli-like heterocyclization reaction for the synthesis of a series of these derivatives based on reactions of aldehydes, β-dicarbonyl compounds, and 3-alkylthio-5-amino-1,2,4-triazoles. The resulting compounds were assayed for antimicrobial activity against the ESKAPE panel of bacteria, followed by investigation of their in vitro activities. These analyses identified a subset of 1,2,4-triazolo[1,5-a]pyrimidines that had good narrow-spectrum antibacterial activity against E. faecium and exhibited metabolic stability with low intrinsic clearance. Macromol. synthesis assays revealed cell-wall biosynthesis as the target of these antibiotics.

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 C8H5F3O3, HPLC of Formula: 21101-63-3.

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

Kim, Heejin published the artcileIntegrated One-Flow Synthesis of Heterocyclic Thioquinazolinones through Serial Microreactions with Two Organolithium Intermediates, Name: (4-(Bromomethyl)phenyl)(trifluoromethyl)sulfane, the publication is Angewandte Chemie, International Edition (2015), 54(6), 1877-1880, database is CAplus and MEDLINE.

An integrated microfluidic synthesis of a biol. active thioquinazolinone library was presented. Generation of o-lithiophenyl isothiocyanate and subsequent reaction with aryl isocyanates was optimized by controlling the residence time in the microreactor to 16 ms at room temperature S-Benzylic thioquinazolinone derivatives I (R¹ = H, F, OMe, NO₂, Cl, R² = H; R¹ = H, R² = F, Cl, OCF₃, SCF₃) were synthesized within 10 s in high yields (75-98 %) at room temperature These three-step reactions involved two organolithium intermediates, an isothiocyanate-functionalized aryllithium intermediate, and a subsequent lithium thiolate intermediate. The gram-scale synthesis of a multifunctionalized thioquinazolinone in the microfluidic device with a high yield (91 %) and productivity (1.25 g in 5 min) was also described.

Angewandte Chemie, International Edition 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, Name: (4-(Bromomethyl)phenyl)(trifluoromethyl)sulfane.

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

Raphael Karikachery, Alice published the artcileHigh Quantum Yield Molecular Bromine Photoelimination from Mononuclear Platinum(IV) Complexes, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane, the publication is Inorganic Chemistry (2013), 52(7), 4113-4119, database is CAplus and MEDLINE.

Pt(IV) complexes trans-Pt(PEt₃)₂(R)(Br)₃ (R = Br, aryl and polycyclic aromatic fragments) photoeliminate mol. bromine with quantum yields as high as 82%. Photoelimination occurs both in the solid state and in solution Calorimetry measurements and DFT calculations (PMe₃ analogs) indicate endothermic and endergonic photoeliminations with free energies from 2 to 22 kcal/mol of Br₂. Solution trapping experiments with high concentrations of 2,3-dimethyl-2-butene suggest a radical-like excited state precursor to bromine elimination.

Inorganic 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, Recommanded Product: 2,3-Dibromo-2,3-dimethylbutane.

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