Tag: M.W=100-150

Schulze, Bastian published the artcileColumn bleed in the analysis of highly polar substances: an overlooked aspect in HRMS, HPLC of Formula: 622-40-2, the publication is Analytical and Bioanalytical Chemistry (2020), 412(20), 4837-4847, database is CAplus and MEDLINE.

Abstract: To close the “anal. gap” in the liquid chromatog. (LC) anal. of highly polar substances, two techniques which have been suggested earlier were tested in terms of retention factors and detection limits: hydrophilic interaction liquid chromatog. (HILIC) and mixed-mode chromatog. (MMC). A substance mix of 55 analytes ranging from logD – 8.2 to 3.4 and 17 different LC columns, also comprising addnl. reversed-phase columns were used. Contrary to most reversed-phase columns, column bleed has been identified as an important factor, which may cause serious restrictions during high-resolution mass spectrometric detection (HRMS). We found that highly abundant background masses continuously eluting from the columns heavily influence ion transmission to the detector. As a result, the linear dynamic range as well as the sensitivity decreases and thus limits the HRMS applicability of some columns. We therefore recommend a thorough investigation of ion transmission during HRMS method development. This will help to maintain the high potential of HRMS in terms of qual. and quant. screening anal.

Analytical and Bioanalytical Chemistry published new progress about 622-40-2. 622-40-2 belongs to alcohols-buliding-blocks, auxiliary class Morpholine,Alcohol, name is 2-Morpholinoethanol, and the molecular formula is C23H20BN, HPLC of Formula: 622-40-2.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

De Smet, Gilles published the artcileSelective Nickel-Catalyzed Hydrodeacetoxylation of Aryl Acetates, Application In Synthesis of 645-56-7, the publication is Angewandte Chemie, International Edition, database is CAplus and MEDLINE.

Ni-catalyzed hydrodeacetoxylation of aryl acetates (Ar-OAc) with HBpin in a green carbonate solvent selectively delivered the corresponding deoxygenated arenes (ArH). The method was also applicable to highly challenging guaiacyl and syringyl acetates, leaving -OMe groups intact without arene reduction Renewable 4-propylguaiacol obtained from pine could also be transformed without significant loss in yield vs. oil derived feedstock. The observed chemoselectivity for Ar-OAc vs. ArO-Ac bond cleavage was rationalized based on mechanistic experiments and DFT calculations ArOH side-product formation was attributed to direct competitive Ni-catalyzed reduction of the C=O bond. Hydrodeacyloxylation of a set of aryl alkanoates featured interesting chemoselectivity with a dramatic influence of the length and structure of the alkyl chain on catalysis.

Angewandte Chemie, International Edition published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, Application In Synthesis of 645-56-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Neumaier, Marco published the artcileKinetics of Intercluster Reactions between Atomically Precise Noble Metal Clusters [Ag₂₅(DMBT)₁₈]^– and [Au₂₅(PET)₁₈]^– in Room Temperature Solutions, Name: 2-Phenylethanethiol, the publication is Journal of the American Chemical Society (2021), 143(18), 6969-6980, database is CAplus and MEDLINE.

The kinetics of intercluster metal atom exchange reactions between solvated [Ag₂₅(DMBT)₁₈]^– and [Au₂₅(PET)₁₈]^– (DMBT and PET are 2,4-dimethylbenzenethiol and 2-phenylethanethiol, resp., both C₈H₁₀S) were probed by electrospray ionization mass spectrometry and computer-based modeling. Anion mass spectra and collision induced dissociation (CID) measurements show that both cluster monomers and dimers are involved in the reactions. We have modeled the corresponding kinetics assuming a reaction mechanism in which metal atom exchange occurs through transient dimers. Our kinetic model contains three types of generic reactions: dimerization of monomers, metal atom exchange in the transient dimers, and dissociation of the dimers to monomers. There are correspondingly 377 discrete species connected by in total 1302 reactions (i.e., dimerization, dissociation and atom exchange reactions) leading to the entire series of monomeric and dimeric products [Ag_mAu_25-m]^– (m = 1-24) and [Ag_mAu_50-m]^2- (m = 0-50), resp. The rate constants of the corresponding reactions were fitted to the exptl. data, and good agreement was obtained with exchange rate constants which scale with the probability of finding a silver or gold atom in the resp. monomeric subunit of the dimer, i.e., reflecting an entropic driving force for alloying. Allowing the dimerization rate constant to scale with increasing gold composition of the resp. reactants improves the agreement further. The rate constants obtained are phys. plausible, thus strongly supporting dimer-mediated metal atom exchange in this intercluster reaction system.

Journal of the American Chemical Society published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, Name: 2-Phenylethanethiol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Rodiansono published the artcileUnravelling the one-pot conversion of biomass-derived furfural and levulinic acid to 1,4-pentanediol catalysed by supported Raney Ni-Sn alloy catalysts, Computed Properties of 111-29-5, the publication is RSC Advances (2022), 12(1), 241-250, database is CAplus and MEDLINE.

Bimetallic Ni-Sn alloys have been recognized as promising catalysts for the transformation of furanic compounds and their derivatives into valuable chems. Herein, we report the utilization of a supported bimetallic RANEY nickel-tin alloy supported on aluminum hydroxide (RNi-Sn(x)/AlOH; x is Ni/Sn molar ratio) catalysts for the one-pot conversion of biomass-derived furfural and levulinic acid to 1,4-pentanediol (1,4-PeD). The as prepared RNi-Sn(1.4)/AlOH catalyst exhibited the highest yield of 1,4-PeD (78%). The reduction of RNi-Sn(x)/AlOH with H₂ at 673-873 K for 1.5 h resulted in the formation of Ni-Sn alloy phases (e.g., Ni₃Sn and Ni₃Sn₂) and caused the transformation of aluminum hydroxide (AlOH) to amorphous alumina (AA). The RNi-Sn(1.4)/AA 673 K/H₂ catalyst contained a Ni₃Sn₂ alloy as the major phase, which exhibited the best yield of 1,4-PeD from furfural (87%) at 433 K, H₂ 3.0 MPa for 12 h and from levulinic acid (up to 90%) at 503 K, H₂ 4.0 MPa, for 12 h. Supported RANEY Ni-Sn(1.5)/AC and three types of supported Ni-Sn(1.5) alloy (e.g., Ni-Sn(1.5)/AC, Ni-Sn(1.5)/c-AlOH, and Ni-Sn(1.5)/γ-Al₂O₃) catalysts afforded high yields of 1,4-PeD (65-87%) both from furfural and levulinic acid under the optimized reaction conditions.

RSC Advances published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C5H12O2, Computed Properties of 111-29-5.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Aubrey, Michael L. published the artcileDependence of Linker Length and Composition on Ionic Conductivity and Lithium Deposition in Single-Ion Conducting Network Polymers, Formula: C5H12O2, the publication is Macromolecules (Washington, DC, United States) (2021), 54(16), 7582-7589, database is CAplus.

Single-ion conducting electrolytes stand as promising alternatives to state-of-the-art electrolytes in lithium batteries, although a single-ion conducting material with high Li⁺ conductivity, stability in contact with lithium, and suitable mech. properties has been slow to emerge. Here, we describe the synthesis of a series of single-ion conducting network polymers from the reaction of tetrakis(4-(chloromethyl)-2,3,5,6-tetrafluorophenyl)borate with oligoethylene glycoxide linkers Li₂O[(CH₂CH₂)O]_n (n = 1, 2, 3, 9, and 22). Polymers with the longest linkers (n = 9 and 22; ANP-9 and ANP-10, resp.) form materials with conductivities of ~10^-6 S cm^-1 at 100°C. With the addition of 65 wt % propylene carbonate (PC), all the network polymers in the series exhibit high conductivities at ambient temperatures, with the n = 1 material (ANP-6) achieving a bulk ionic conductivity of 2.5 × 10^-4 S cm^-1 at 25°C. More conductive single-ion conducting gels could be prepared by using the less coordinating pentanediol dilithium salt as a linker (ANP-11; σ = 3.5 × 10^-4 S cm^-1 at 25°C), although this material exhibited a surprisingly high interfacial resistance in contact with a lithium electrode. In contrast, the gel formed with ANP-6 is notably stable in contact with metallic lithium electrodes, displays a lithium-ion transference number of unity, and boasts a wide electrochem. stability window of greater than 4.5 V. Temperature-dependent ac impedance anal. reveals that the ionic conductivity of this material-and likely the other gels in the series-matches closely to a Vogel-Tamman-Fulcher temperature model.

Macromolecules (Washington, DC, United States) published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C5H12O2, Formula: C5H12O2.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Saleemi, Sidra published the artcileBio-Inspired Hierarchical Carbon Nanotube Yarn with Ester Bond Cross-Linkages towards High Conductivity for Multifunctional Applications, Computed Properties of 111-29-5, the publication is Nanomaterials (2022), 12(2), 208, database is CAplus and MEDLINE.

The cross-linked hierarchical structure in biol. systems provides insight into the development of innovative material structures. Specifically, the sarcoplasmic reticulum muscle is able to transmit elec. impulses in skeletal muscle due to its cross-linked hierarchical tubular cell structure. Inspired by the cross-linked tubular cell structure, we designed and built chem. cross-links between the carbon nanotubes within the carbon nanotube yarn (CNT yarn) structure by an esterification reaction. Consequently, compared with the pristine CNT yarn, its elec. conductivity dramatically enhanced 348%, from 557 S/cm to 1950 S/cm. Furthermore, when applied with three voltages, the electro-thermal temperature of esterified CNT yarn reached 261°C, much higher than that of pristine CNT yarn (175°C). In addition, the esterified CNT yarn exhibits a linear and stable piezo-resistive response, with a 158% enhanced gauge factor (the ratio of elec. resistance changing to strain change ∼1.9). The superconductivity, flexibility, and stable sensitivity of the esterified flexible CNT yarn demonstrate its great potential in the applications of intelligent devices, smart clothing, or other advanced composites.

Nanomaterials published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C5H12O2, Computed Properties of 111-29-5.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Timperley, Christopher M. published the artcileFluorinated phosphorus compounds Part 6. The synthesis of bis(fluoroalkyl) phosphites and bis(fluoroalkyl) phosphorohalidates, HPLC of Formula: 2240-88-2, the publication is Journal of Fluorine Chemistry (2002), 113(1), 65-78, database is CAplus.

Reaction of P trichloride with tert-BuOH and fluoro alcs. gave bis(fluoroalkyl) phosphites (R_FO)₂P(O)H in 42-89% yield, where R_F = HCF₂CH₂, H(CF₂)₂CH₂, H(CF₂)₄CH₂, CF₃CH₂, C₂F₅CH₂, C₃F₇CH₂, (CF₃)₂CH, (FCH₂)₂CH, CF₃Me₂C, (CF₃)₂CH₃C, CF₃CH₂CH₂, C₄F₉CH₂CH₂ and C₆F₁₃CH₂CH₂. Treatment of these with Cl₂ in CH₂Cl₂ gave the bis(fluoroalkyl) phosphorochloridates (R_FO)₂P(O)Cl in 49-96% yield. The chloridate (CF₃CH₂O)₂P(O)Cl was isolated in much lower yield from the interaction of thionyl chloride with bis(trifluoroethyl) phosphite. Heating the latter in CH₂Cl₂ with KF and a catalytic amount of HO₂CCF₃ gave the corresponding fluoridate (CF₃CH₂O)₂P(O)F in 84% yield. Treatment of bis(trifluoroethyl) phosphite with Br₂ or I₂ gave the bromidate (CF₃CH₂O)₂P(O)Br and iodidate (CF₃CH₂O)₂P(O)I in 51 and 46% yield, resp. The iodidate is the 1st dialkyl phosphoroiodidate to have been isolated and characterized properly-its discovery lags behind the 1st isolation of a dialkyl phosphorochloridate by over 130 yr. The fluoroalkyl phosphoryl compounds are generally more stable than known unfluorinated counterparts.

Journal of Fluorine Chemistry published new progress about 2240-88-2. 2240-88-2 belongs to alcohols-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Aliphatic hydrocarbon chain,Alcohol, name is 3,3,3-Trifluoropropan-1-ol, and the molecular formula is C7H13NO2, HPLC of Formula: 2240-88-2.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

O’Brien, Luke published the artcileGold(I)-Catalyzed Nucleophilic Allylation of Azinium Ions with Allylboronates, Computed Properties of 25240-59-9, the publication is Angewandte Chemie, International Edition (2022), 61(22), e202202305, database is CAplus and MEDLINE.

Gold(I)-catalyzed nucleophilic allylations of pyridinium and quinolinium ions with various allyl pinacolboronates was reported. The reactions was completely selective with respect to the site of the azinium ion that was attacked, to give various functionalized 1,4-dihydropyridines and 1,4-dihydroquinolines. Evidence suggested that the reactions proceed through nucleophilic allylgold(I) intermediates formed by transmetalation from allylboronates. D. functional theory (DFT) calculations provided mechanistic insight.

Angewandte Chemie, International Edition published new progress about 25240-59-9. 25240-59-9 belongs to alcohols-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol, and the molecular formula is C6H13BO3, Computed Properties of 25240-59-9.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Mitsui, Masaaki published the artcileOn the Origin of Photoluminescence Enhancement in Biicosahedral Ag_xAu_25-x Nanoclusters (x = 0-13) and Their Application to Triplet-Triplet Annihilation Photon Upconversion, SDS of cas: 4410-99-5, the publication is Advanced Optical Materials, database is CAplus.

Numerous reports hitherto show that the photoluminescence (PL) properties of metal nanoclusters (NCs) can be enhanced by alloying the metal cores. In particular, biicosahedral [Ag_xAu_25-x(PPh₃)10(SR)5Cl₂]²⁺ (abbreviated as Ag_xAu_25-x hereafter; with PPh₃ = triphenylphosphine; SR = thiolate ligand) NCs attract significant attention because their PL quantum yield is improved by 200 times when 13 Au atoms are replaced with Ag atoms (x = 13). In this contribution, the origin of the PL in the Ag_xAu_25-x system and its remarkable enhancement are investigated on the basis of spectroscopic investigations of the PL behavior and its quenching by an organic fluorophore, finding that (i) the observed PL of Ag_xAu_25-x is phosphorescent; (ii) not only Ag₁₃Au₁₂ but also Ag₁₂Au₁₃ NCs contribute to the PL; and (iii) replacing the central vertex atom of the biicosahedron with an Ag atom causes a blue shift of the triplet states, which suppresses the T1-S0 intersystem crossing and enhances the phosphorescence emission. Addnl., the results of single-particle PL spectroscopy and defocused imaging with rotation of linearly polarized excitation light reveal that the phosphorescence transition dipole moment of Ag₁₃Au₁₂ exists in the long axis direction of the biicosahedron. Furthermore, the Ag_xAu_25-x NCs can sensitize mol. triplets and efficiently induce red-to-blue photon upconversion via triplet-triplet annihilation.

Advanced Optical Materials published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, SDS of cas: 4410-99-5.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kesavan, Arunachalam published the artcileCatalytic enantioselective oxysulfenylation of o-vinylanilides, Safety of 2-Phenylethanethiol, the publication is Chemical Communications (Cambridge, United Kingdom) (2022), 58(2), 282-285, database is CAplus and MEDLINE.

Tf₂NH-Assisted BINAM-derived thiophosphoramide catalysis was accomplished for the enantioselective oxysulfenylation of o-vinylanilides with N-(aryl/alkylthio)imides. The developed reaction offered access to diverse substituted aryl/alkylthio tethered 3,1-benzoxazines I [R = 6-MeO, 6-Cl, 7-Cl, 8-MeO, 8-BzO; R¹ = Ph, 4-EtC₆H₄, 4-FC₆H₄, etc.; Ar = Ph, Bn, 2-MeC₆H₄, etc.; Ar¹ = Ph, 4-MeC₆H₄, 3-IC₆H₄, etc.] in excellent yields and enantiomeric ratios. Furthermore, synthetic applications of benzoxazines and aryl/alkylthio moieties and a transition state model for the observed enantioselectivity were also discussed.

Chemical Communications (Cambridge, United Kingdom) published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, Safety of 2-Phenylethanethiol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts