Tag: M.W=200-250

Hartrampf, Felix W. W. published the artcileA Conia-Ene-Type Cyclization under Basic Conditions Enables an Efficient Synthesis of (-)-Lycoposerramine R, COA of Formula: C7H13BrSi, the publication is Angewandte Chemie, International Edition (2017), 56(3), 893-896, database is CAplus and MEDLINE.

An enantioselective total synthesis of the Lycopodium alkaloid lycoposerramine R (I) is presented. It relies on a base-mediated cyclization that resembles the Conia-ene reaction of ynones and gold-catalyzed variants thereof. Thus, hydrindanones and other functionalized ring systems bearing an exocyclic alkene can be rapidly accessed at room temperature without noble metal catalysis or substrate preactivation.

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 C7H13BrSi, COA of Formula: C7H13BrSi.

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

El-Tabei, A. S. published the artcileNewly imine-azo dicationic amphiphilic for corrosion and sulfate-reducing bacteria inhibition in petroleum processes: Laboratory and theoretical studies, Formula: C12H25Br, the publication is Applied Surface Science (2022), 151531, database is CAplus.

Oil and gas process faces a large dilemma during the acidizing job. So, dicationic surfactant namely; 1-dodecyl-3-((E)-(4-(((E)-(1-dodecylpyridin-1-ium-4-yl) methylene)amino)-2-hydroxyphenyl) diazenyl)pyridin-1-iumdibromide (SDCAC) was synthesized. Spectroscopic and CHN elemental anal. studies confirmed the SDCAC structure. SDCAC has Surface active properties. The anticorrosion performance of SDCAC for carbon steel (CS) in 1.0 M HCl has been validated gravimetrically and electrochem. accompanied with surface anal. studies. SDCAC enhances the resistance of CS corrosion by 98%. Tafel data classify SDCAC as a hybrid anticorrosive substance. Adsorption of SDCAC is more fitted to the Langmuir adsorption isotherm model. Theor. indexes of SDCAC affirm its tendency toward adsorption. The activity of SDCAC against sulfate reducing bacteria (SRB) has been examined and promising outcomes have been achieved. According to the findings of this investigation, the SDCAC can reduce SRB growth from 10⁷ to10² cell/mL.

Applied Surface 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, Formula: C12H25Br.

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

O’Connell, Kathleen M. published the artcileElectron-transfer reactions and associated conformational changes. Electrochemical reduction of some vicinal dibromides, Computed Properties of 594-81-0, the publication is Journal of the American Chemical Society (1983), 105(6), 1473-81, database is CAplus.

The effect of mol. conformation on the electrochem. reduction of derivatives of trans-1,2-dibromocyclohexane and substituted 1,2-dibromoethanes was studied by low-temperature cyclic voltammetry. Reduction via conformations with antiperiplanar Br atoms is preferred, and conformational interconversion prior to electron transfer was observed in trans-1,2-dibromo- (I) and 1,1-dimethyl-trans-3,4-dibromocyclohexane (II), meso– and dl-Ph(CHBr)₂Ph (meso– and dl–III), and Br(CMe₂)₂Br (IV). Digital simulation of the low-temperature voltammetric data provided thermodn. and kinetic information on the conformational interconversion in I, II, III, and IV. The energy barriers to conformational interconversion in meso– and dl-Me(CHBr)₂Me (meso– and dl–V) are quite small, and conformational effects in the electrochem. reduction of V could not be detected at -135°. 1-Methyl-cis-3,trans-4- (VI) and –trans-3,cis-4-dibromocyclohexane (VII) and meso– and dl-Me₂CH(CHBr)₂CHMe₂ (meso– and dl–VIII) exist almost entirely in a single conformation. Voltammetric peak potentials of VI, VII, and meso– and dl–VIII reflect the geometry of their principal conformation.

Journal of the American Chemical Society 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, Computed Properties of 594-81-0.

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

Yin, Yan published the artcileSynthesis and properties of highly sulfonated proton conducting polyimides from bis(3-sulfopropoxy)benzidine diamines, Related Products of bromides-buliding-blocks, the publication is Journal of Materials Chemistry (2004), 14(6), 1062-1070, database is CAplus.

Two novel sulfonated diamine isomers, 2,2′-bis(3-sulfopropoxy)benzidine (2,2′-BSPB) and 3,3′-bis(3-sulfopropoxy)benzidine (3,3′-BSPB), were successfully synthesized and the highly sulfonated polyimides (SPIs) with sulfonic acid groups in the side chains were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) and BSPB monomers. Transmission electron microscopy (TEM) anal. revealed that these side-chain-type SPI membranes have a microphase-separated structure composed of hydrophilic side chain domains and hydrophobic polyimide main chain domains. They showed high proton conductivities similar to or higher than those of Nafion 117 in the high relative humidity range (>70% RH). The proton conducting behavior was analyzed by percolation theory. Despite their high ion exchange capacity (IEC = 2.89 meq. g^-1) and high water uptakes, they displayed much better water stability than common sulfonated polyimides with the sulfonic acid groups directly bonded to the polymer backbone. This is probably due to the microphase-separated structure of the membrane and the strong basicity of BSPB diamine moieties resulting from the electron donating effect of the propoxy groups. The sulfopropoxy groups were stable against aging in acidic aqueous solution at 373 K. Both the polyimide membranes showed good mech. strength under high moisture conditions (about 6 GPa at 90% RH) and displayed anisotropic membrane swelling.

Journal of Materials Chemistry 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 C11H10N4, Related Products of bromides-buliding-blocks.

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

Yin, Yan published the artcileSynthesis, proton conductivity and methanol permeability of a novel sulfonated polyimide from 3-(2′,4′-diaminophenoxy)propane sulfonic acid, HPLC of Formula: 55788-44-8, the publication is Polymer (2003), 44(16), 4509-4518, database is CAplus.

A novel sulfonated diamine monomer, 3-(2′,4′-diaminophenoxy)propane sulfonic acid (DAPPS), was successfully synthesized and the sulfonated polyimide (SPI) was prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) and DAPPS. The resulting SPI, NTDA-DAPPS, was soluble in common organic solvents. The SPI membrane displayed proton conductivity σ values of 0.12-0.35 S/cm at temperatures ranging from 35 to 90 °C in liquid water, which were similar to or higher than those of Nafion 117 and sulfonated hydrocarbon polymers. The σ of the SPI membrane decreased significantly with decreasing relative humidity (RH) and became much lower than that of Nafion 117 at 30% RH. The SPI membrane displayed good water stability at 80 °C and was thermally stable up to 240 °C. It showed reasonable mech. strength of a modulus of 1.3 GPa at 90 °C and 90% RH. Its methanol permeability P_M was 0.57×10^-6 cm²/s at 30 °C and 8.6 wt% methanol in feed, which was a fourth of that of Nafion 117. As a result, its ratio of σ/P_M was 21×10⁴ S cm^-3 s, which was about 4 times larger than that of Nafion 117, suggesting potential application of the SPI membrane for direct methanol fuel cell.

Polymer 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 C22H21N3O3S, HPLC of Formula: 55788-44-8.

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

Shi, Hang published the artcileTotal Syntheses of Drimane-Type Sesquiterpenoids Enabled by a Gold-Catalyzed Tandem Reaction, Safety of (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Journal of the American Chemical Society (2011), 133(38), 14944-14947, database is CAplus and MEDLINE.

Development of a gold-catalyzed tandem reaction of 1,7-diynes with both internal and external nucleophiles was realized, which constructed five chem. bonds, two rings, and two stereogenic centers in a single step. Based on the novel cascade transformation, we achieved a unified strategy toward the stereoselective total syntheses of C-15 oxygenated drimane-type sesquiterpenoids and their analogs, which provided the natural products kuehneromycin A, antrocin, anhydromarasmone, and marasmene as a proof-of-concept study.

Journal of the American Chemical Society 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 C5H12O2, Safety of (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Yu, Changjiang published the artcileSynthesis and Spectral Properties of Aggregation-Induced Emission-Active Push-Pull Chromophores Based On Isoindole Scaffolds, Computed Properties of 143-15-7, the publication is Organic Letters (2022), 24(25), 4557-4562, database is CAplus and MEDLINE.

A new class of tailor-made push-pull isoindole fluorophores has been synthesized through the combination of Suzuki coupling and Knoevenagel reactions. The efficient synthetic strategy rendered the isoindole scaffold as the π-bridge and the isolation spacer and provided dyes bearing various types of electron donors and electron acceptors for manipulating their energy gaps and tuning their absorptions and emissions. Most of the N-alkylated isoindole dyes showed aggregation-induced emission behaviors suitable for bioimaging and nice solid-state emission with maxima up to 851 nm.

Organic Letters 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 C8H16O2, Computed Properties of 143-15-7.

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

Guo, Pu published the artcileCompound shape effects in minor groove binding affinity and specificity for mixed sequence DNA, HPLC of Formula: 53484-26-7, the publication is Journal of the American Chemical Society (2018), 140(44), 14761-14769, database is CAplus and MEDLINE.

AT-specific heterocyclic cations that bind in the DNA duplex minor groove have had major successes as cell and nuclear stains and as therapeutic agents which can effectively enter human cells. Expanding the DNA sequence recognition capability of the minor groove compounds could also expand their therapeutic targets and have an impact in many areas, such as modulation of transcription factor biol. activity. 2268681509. Success in the design of mixed sequence binding compounds has been achieved with N-methylbenzimidazole (N-MeBI) thiophenes which are preorganized to fit the shape of the DNA minor groove and H-bond to the -NH of G·C base pairs that projects into the minor groove. Initial compounds bound strongly to a single G·C base pair in an AT context with a specificity ratio of 50 (K_d AT-GC/K_d AT) or less and this was somewhat low for biol. use. We felt that modifications of compound shape could be used to probe local DNA microstructure in target mixed base-pair sequences of DNA and potentially improve the compound binding selectivity. Modifications were made by increasing the size of the benzimidazole N-substituent, e.g., by using N-iso-Bu instead of N-Me, and by changing the mol. twist by introducing substitutions at specific positions on the aromatic core of the compounds In both cases, we were able to achieve a dramatic increase in binding specificity, including no detectable binding to pure AT sequences, without a significant loss in affinity to mixed base-pair target sequences.

Journal of the American Chemical Society published new progress about 53484-26-7. 53484-26-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Nitro Compound,Amine,Benzene, name is 4-Bromo-N-methyl-2-nitroaniline, and the molecular formula is C7H7BrN2O2, HPLC of Formula: 53484-26-7.

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

Servis, Kenneth L. published the artcileNMR isotope shifts as a probe of electronic structure, HPLC of Formula: 594-81-0, the publication is Journal of the American Chemical Society (1985), 107(24), 7186-7, database is CAplus.

The β-D isotope effects on the C-13 chem. shifts of 2,3-dimethyl-2-butene, 2,3-dimethyl-2-butene bromonium ion, and 2,3-dimethyl-2-butene mercurinium ion suggests that these cationic derivatives have different electronic structures. The β-D isotope effect in the bromonium ion is pos. (downfield shift) while that in the mercurinium ion is neg. (upfield shift). A comparison with β-D isotope shifts in other cations suggests that the β effects can be related to the electronic structure of these ions.

Journal of the American Chemical Society 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 C6H3ClFNO2, HPLC of Formula: 594-81-0.

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

Pels, Kevin published the artcileSolvent-free phase-vanishing reactions with PTFE (Teflon) as a phase screen, Synthetic Route of 594-81-0, the publication is Beilstein Journal of Organic Chemistry (2009), No pp. given, NO. 75, database is CAplus and MEDLINE.

In a solvent-free phase-vanishing reaction with PTFE (polytetrafluoroethylene, Teflon) tape as the phase screen, a thermometer adapter is utilized to insert a PTFE-sealed tube into the vapor phase above the substrate. Besides avoiding use of solvents, the exptl. design is not dependent upon the densities of the reactants and the procedure generates little or no waste while providing the reaction products in high yield and in high purity.

Beilstein 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