Month: December 2022

Scott, Philip J. published the artcilePhosphonium-Based Polyzwitterions: Influence of Ionic Structure and Association on Mechanical Properties, Synthetic Route of 55788-44-8, the publication is Macromolecules (Washington, DC, United States) (2020), 53(24), 11009-11018, database is CAplus.

This manuscript describes a synthetic strategy and structure-property investigation of unprecedented phosphonium-based zwitterionic homopolymers (polyzwitterions) and random copolymers (zwitterionomers). Free radical polymerization of 4-(diphenylphosphino)styrene (DPPS) provided neutral polymers containing reactive triarylphosphines. Quant. postpolymn. alkylation of these pendant functionalities generated a library of polymers containing various concentrations of neutral phosphines, phosphonium ions, and phosphonium sulfobetaine zwitterions. The zwitterionic homo- and copolymers exhibited significantly higher glass transition temperatures (T_g) and enhanced mech. reinforcement in comparison to neutral and phosphonium analogs. These changes in T_g and mech. properties were attributed to nanoscale morphol. domains, which formed due to electrostatic interactions between zwitterionic groups, as revealed by X-ray scattering and broadband dielec. spectroscopy (BDS). BDS revealed increased static dielec. constants (>25) for the phosphonium zwitterionomers compared to ionomeric or neutral analogs. These high static dielec. constants for the solvent-free polyzwitterions supported their stronger polarization response in comparison with polymers containing neutral phosphines and phosphonium ions, and these interactions accounted for morphol. differences and enhanced mech. behavior. This work describes a versatile strategy for modulating electrostatic interactions with tunable mech. properties for an unprecedented family of zwitterionic polymers.

Macromolecules (Washington, DC, United States) 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 C12H17NS2, Synthetic Route of 55788-44-8.

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

Norrild, Jens Chr. published the artcileDesign, synthesis and structure of new potential electrochemically active boronic acid-based glucose sensors, Computed Properties of 166821-88-1, the publication is Journal of the Chemical Society, Perkin Transactions 2 (2002), 303-311, database is CAplus.

In the authors’ studies on new boronic acid based carbohydrate sensors three new boronic acids (2-FcCH₂NMeCH₂C₆H₄B(OH)₂ (3), 1,2-(2-(HO)₂BC₆H₄CH₂NMeCH₂)₂ferrocene (7) and 1,1′-(2-(HO)₂BC₆H₄CH₂NMeCH₂)₂ferrocene (11)) containing a ferrocene moiety were synthesized. Their design includes an intramol. B-N bonding motif to facilitate binding at physiol. pH. The authors report the synthesis of the compounds and studies on glucose complexation as studied by ¹³C NMR spectroscopy. The crystal structure of 2,4,6-tris[2-(N-ferrocenylmethyl-N-methylaminomethyl)phenyl]boroxin (13) (boroxin of boronic acid 3) (boroxin = cyclotriboroxane) was obtained and compared with structures obtained of 2,4,6-tris[2-(N,N-dimethylaminomethyl)phenyl]boroxin (14) and 2-(2-(dimethylaminomethyl)phenyl)-5,5-dimethyl-1,3,2-dioxaborinane (15). The structure of 13 shows the existence of intramol. B-N bonds in the solid phase.

Journal of the Chemical Society, Perkin Transactions 2 published new progress about 166821-88-1. 166821-88-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzyl bromide,Benzene,Boronic Acids,Boronic acid and ester, name is 2-(2-(Bromomethyl)phenyl)-5,5-dimethyl-1,3,2-dioxaborinane, and the molecular formula is C12H16BBrO2, Computed Properties of 166821-88-1.

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

Thaharn, Watcharaporn published the artcileRadical Cyclization/ipso-1,4-Aryl Migration Cascade: Asymmetric Synthesis of 3,3-Difluoro-2-propanoylbicyclo[3.3.0]octanes, Synthetic Route of 69361-41-7, the publication is Angewandte Chemie, International Edition (2014), 53(8), 2212-2215, database is CAplus and MEDLINE.

A novel method for the asym. synthesis of 3,3-difluoro-2-propanoylbicyclo-[3.3.0]octanes involves an unprecedented intramol. radical cyclization/ipso-1,4-aryl migration cascade. The synthesis of the target compounds was achieved by a cyclization reaction of a cyclopentene-ketone derivative (I) to provide an alc. derivative (II) with was converted into an [(aryl)(methylene)pentalenyl](fluoro)propanone derivative (III).

Angewandte Chemie, International Edition 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 C4H6N2, Synthetic Route of 69361-41-7.

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

Katariya, Kanubhai D. published the artcileCoumarin derivatives containing Schiff base and ester mesogenic core: Synthesis, mesomorphic behaviour and DFT calculations, Category: bromides-buliding-blocks, the publication is Journal of Molecular Structure (2022), 133043, database is CAplus.

New coumarin esters, (E)-4-[[[7-(octyloxy)-2-oxo-2H-chromen-3-yl]imino]methyl]phenyl-4-alkyloxybenzoates, containing a Schiff base linkage in which an octyloxy chain is at one end and different long terminal alkoxy chains (C2-C18) are at the other end, have been synthesized and studied for their mesomorphic behavior. The investigation of phase and mesophase transitions was carried out using differential scanning calorimetry and a Polarized Optical Microscope. The mesomorphic investigation revealed that all new derivatives exhibited an enantiotropic nematic phase and, except for two compounds, I [R = C_nH_2n+1, n = 2, 3], all the members also displayed enantiotropic smectic C phase in addition to enantiotropic nematic phase. The new mesogens mesomorphic behavior of all synthesized compounds were thoroughly studied and discussed, as well as compared with structurally comparable substances. Finally, the DFT theor. calculations were studied and compared with the exptl. to explain the relationship between the structural parameters and the mesomorphic behavior.

Journal of Molecular Structure 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, Category: bromides-buliding-blocks.

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

Ke, Miaolin published the artcileCopper-Catalyzed 1,6-Hydrodifluoroacetylation of para-Quinone Methides at Ambient Temperature with Bis(pinacolato)diboron as Reductant, Name: Ethylbromofluoroacetate, the publication is Advanced Synthesis & Catalysis (2017), 359(3), 384-389, database is CAplus.

An original and efficient copper-catalyzed 1,6-hydrodifluoroacetylation of para-quinone methides with difluoroalkyl bromides has been described with bis(pinacolato)diboron (B₂pin₂) as reductant. In this reaction, a new C(sp³)-CF₂ bond is constructed under smart conditions. A broad substrate scope of para-quinone methides (p-QMs) make this protocol very practical and attractive. Preliminary mechanistic studies manifested that a difluoroalkyl radical pathway was involved in this reaction. Also the presence of the diboron reagent was an essential requisite in this transformation.

Advanced Synthesis & Catalysis 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, Name: Ethylbromofluoroacetate.

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

Choi, Min Hee published the artcileEffect of side chains on solubility and morphology of poly(benzodithiohene-alt-alkylbithiophene) in organic photovoltaics, Recommanded Product: 2-Bromo-3-(2-ethylhexyl)thiophene, the publication is Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) (2015), 120-128, database is CAplus.

It was reported that the side chains play especially an important role in enhancing phys. properties and energy levels. Polythiophene based on benzodithiophene has excellent carrier mobility, but high HOMO level. We synthesized polythiophenes, PBDTBiTh(2EH) and PBDTBiTh(12C), were polymerized using the Stille coupling reaction and had thiophene with a 2-ethylhexyl or n-dodecyl side chain. Upon introducing the 2-ethylhexyl side chain, the absorption coefficients of the monomers and polymers were enhanced. Also, the edge-on orientation was fortified and the HOMO level was decreased to -5.37 eV. PBDTBiTh(2EH) showed a power conversion efficiency (PCE) of 2.1%, which was double that of PBDTBiTh(12C).

Journal of Industrial and Engineering Chemistry (Amsterdam, Netherlands) 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, Recommanded Product: 2-Bromo-3-(2-ethylhexyl)thiophene.

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

Wang, Zhixia published the artcileThe synthesis of quaternary N-alkyl tropinium cationic surfactants and study on their properties: effect of temperature, hydrophobic chain length and anions, SDS of cas: 143-15-7, the publication is Journal of Molecular Structure (2022), 133732, database is CAplus.

Quaternary N-alkyl tropinium cationic surfactants (TILS) were synthesized and characterized. The effect of temperature, hydrophobic chain length and anions on their properties were studied. By changing the structure of anion, the krafft point was significantly reduced (from 313.15 K to <273.15 K) and wide temperature window was obtained. The critical micelle concentration (CMC) value of TILS based on elec. conductivity method is decreased ∼4-5 times by increasing hydrophobicity of anions. At lower temperature and longer hydrophobic chain, TILS had lower CMC value and better surface activity. The thermodn. properties of micellization Gibbs free energy ΔG_mic, enthalpy ΔH_mic and entropy TΔS_mic of micelles were obtained by Mass action model. The micellization process of the TILS was spontaneous and more stable with the increase of anionic hydrophobicity. With the increase of hydrophobic side chain length, the driving force of surfactant micellization may be enthalpy driven at higher temperature and entropy driven at lower temperature The micro-environment of TILS solution with different concentrations was studied by UV spectrophotometry with curcumin as a probe and the change of micro-environment was used to determine the CMC of TILS. The CMC values were similar obtained by 2 methods.

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 C12H20O6, SDS of cas: 143-15-7.

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

Verolet, Quentin published the artcileDesign and Synthesis of Mixed Oligomers with Thiophenes, Dithienothiophene S,S-Dioxides, Thieno[3,4]pyrazines and 2,1,3-Benzothiadiazoles: Flipper Screening for Mechanosensitive Systems, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is ChemistryOpen (2015), 4(3), 264-267, database is CAplus and MEDLINE.

Monomers with large surface area and high quantum yield, that was fluorescent flippers, were engineered into twisted push-pull oligomers to create membrane probes with high mechanosensitivity and long fluorescence lifetime. The synthesis and characterization of thieno[3,4]pyrazines and 2,1,3-benzothiadiazoles were described in comparison with the original dithienothiophene S,S-dioxides. Dithienothiophene S,S-dioxide flippers were confirmed as the best reported so far, and poor results with single flipper probes support that two flippers were needed for the probe to really ‘swim’ i.e., for high mechanosensitivity.

ChemistryOpen 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 C13H10F2, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Parsons, Brendon A. published the artcileAn optimized procedure for PTFE phase vanishing reactions: an improved reaction design and the use of reagents adsorbed on silica, COA of Formula: C6H12Br2, the publication is Journal of Chemical Research (2015), 39(10), 574-581, database is CAplus.

While the phase-vanishing (PV)-PTFE reaction design works well with a broad range of substrates and reaction conditions, there are occasional problems. A description of the problems and their importance, including their effects on the reaction outcome and ways to address them, are discussed. Details of an improved design, a hybrid of previously reported PV-PTFE and solvent-free PV-PTFE designs, is presented, as well as the use of silica-supported reagents.

Journal of Chemical Research 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

Krishnananthan, Subramaniam published the artcileRegioselective Synthesis of Substituted 4-Alkylamino and 4-Arylaminophthalazin-1(2H)-ones, Product Details of C10H16Br3N, the publication is Journal of Organic Chemistry (2016), 81(4), 1520-1526, database is CAplus and MEDLINE.

An efficient regioselective synthesis of substituted 4-alkylamino and 4-arylaminophthalazin-1(1H)-ones 5 is described. This new method features the formation of substituted phthalazin-1(1H)-ones 3 by the reaction of 2-formylbenzoic acids 1 or 3-hydroxyisobenzofuran-1(3H)-ones 2 with hydrazine to generate phthalazin-1(2H)-ones 3. Subsequent regioselective bromination of phthalazin-1(2H)-ones 3 with benzyltrimethylammonium tribromide (BTMA-Br₃) followed by mixed copper-copper oxide-catalyzed amination of 4-bromophthalazin-1(2H)-ones 4 with primary amines generates aminophthalazin-1(2H)-ones in good overall yields.

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, Product Details of C10H16Br3N.

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