Category: ethers-buliding-blocks

Bordwell, F. G. published the artcileAcidities of carboxamides, hydroxamic acids, carbohydrazides, benzenesulfonamides, and benzenesulfonohydrazides in DMSO solution, Name: 2-Methoxyacetamide, the publication is Journal of Organic Chemistry (1990), 55(10), 3330-6, database is CAplus.

A comparison of acidities of 6 series of analogous oxygen, nitrogen, and carbon acids in DMSO solution and the gas phase has shown that the element effect usually causes nitrogen acids to be more acidic than their carbon acid counterparts by an average of 17 ± 5 kcal/mol, and oxygen acids to be more acidic than their nitrogen counterparts by a like amount A much smaller difference was observed between the NH acidities of carboxamides and the CH acidities of ketones (1-2 kcal/mol in DMSO and 7-8 kcal/mol in the gas phase). Equilibrium acidities in DMSO for a number of substituted benzamides, acetamides, N-phenylacetamides, acetoxyhydroxamic acids, benzohydroxamic acids, carbohydrazides, and benzenesulfonamides are reported. Aceto- and benzohydroxamic acids were found to be 9.8 and 10.1 pK_HA units more acidic in DMSO, resp., than acetamide and benzamide. In each instance the effect of N-alkylation decreased the acidity more than did O-alkylation, which indicates that the parents are NH, rather than OH, acids in DMSO. Conclusive supporting evidence for the NH acid assignment was provided by the observation that the N-alkylhydroxamic acids exhibited strong homo-H-bonding, whereas the parent acids and the O-alkyl derivatives did not. Oxidation potentials of hydroxamate anions in DMSO are close to those of O-alkylhydroxamate ions, confirming that their conjugate acids are NH acids, but in MeOH they are close to those of N-alkylhydroxamate ion showing that their conjugate acids can act as OH acids in hydroxylic solvents. The N-alkyl- and O-alkylhydroxamic acids exhibited much stronger chelating power toward K⁺, Na⁺, and Li⁺ ions than did the parent acids.

Journal of Organic Chemistry published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Name: 2-Methoxyacetamide.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Pompeo, Matthew published the artcilePd-PEPPSI-IPent^Cl: A Highly Effective Catalyst for the Selective Cross-Coupling of Secondary Organozinc Reagents, Safety of 2-Isopropylanisole, the publication is Angewandte Chemie, International Edition (2012), 51(45), 11354-11357, database is CAplus and MEDLINE.

A series of Pd-PEPPSI complexes with various substitution pattern on the heterocyclic carbene backbone were designed, prepared and studied as catalysts in Negishi cross-coupling reactions of aryl and heteroaryl halides or triflates with secondary organozinc nucleophiles. In all the cases, the selectivity for the normal, non-rearranged products was observed Computational studies revealed that the relative barrier difference between reductive elimination and β-hydride elimination correlate well with observed selectivities. The best results were shown by the Pd-PEPPSI-IPent^cl complex which demonstrated unprecedented selectivity leading to virtually one (desired) isomer for reactions of a wide selection of alkylzincs and highly functionalized (hetero)aromatic halides and triflates.

Angewandte Chemie, International Edition published new progress about 2944-47-0. 2944-47-0 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 2-Isopropylanisole, and the molecular formula is C10H14O, Safety of 2-Isopropylanisole.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Asano, Yasuhisa published the artcileMicrobial degradation of nitrile compounds. Part V. Aliphatic nitrile hydratase from Arthrobacter sp. J-1. Purification and characterization, Category: ethers-buliding-blocks, the publication is Agricultural and Biological Chemistry (1982), 46(5), 1165-74, database is CAplus.

Aliphatic nitrile hydratase (I) was purified âˆ?90-fold with a yield of 10% from the cell-free extract of acetonitrile-grown Arthrobacter species J-1. Purified I was homogeneous by ultracentrifugation and disc gel electrophoresis. I catalyzed the stoichiometric hydration of acetonitrile to form acetamide. I was inducibly formed and then amidase, which hydrolyzed acetamide, was formed. The mol. weight of I was âˆ?20,000 by gel filtration. I was composed of 2 kinds of subunits with mol. weights of 24,000 and 27,000. The isoelec. point was 3.6. I was active toward low-mol.-weight of 2-5 C atoms. The K_m for acetonitrile was 5.78 mM. I was inactivated by SH-group reagents and competitively inhibited by KCN with a K_i of 1.5 μM.

Agricultural and Biological Chemistry published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Category: ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cody, Robert B. published the artcileIntegrated data analysis making use of the total information from gas chromatography and high-resolution time-of-flight mass spectrometry to identify qualitative differences between two whisky samples, Name: 4-Hydroxy-3,5-dimethoxybenzaldehyde, the publication is Rapid Communications in Mass Spectrometry (2022), 36(3), e9225, database is CAplus and MEDLINE.

Anal. of complex mixtures with gas chromatog. coupled with high-resolution time-of-flight mass spectrometry (GC/HRTOFMS) can produce a large amount of data. A new software program was recently reported that integrates all of the available mass spectrometric information from GC/HRTOFMS anal. into a concise report. New capabilities have now been added to the software to incorporate retention index data and to identify differences between two samples. Two Scotch whisky samples were sampled by solid-phase microextraction (SPME) and analyzed by GC/HRTOFMS. One of the two whisky samples (Sample B) was identical to the other sample (Sample A) except for an addnl. 6-mo storage in sherry casks. Both electron ionization (EI) and chem. ionization (CI) data were obtained using a new GC/TOFMS system (JEOL AccuTOF GC-Alpha) with enhanced resolving power and mass accuracy. Statistical anal. of replicate measurements of the whisky samples was carried out with a new software program (msFineAnal. version 3.2) to identify and assign differences between the samples. There were 124 peaks detected in the two whiskies. Thirteen compounds were detected with a relative peak area greater than 0.05% that were present in greater amounts in the whisky that had been stored in sherry casks for an addnl. 6 mo. Ten of these compounds were identified by the software with high confidence, two were identified as isomers with close retention indexes, and one was identified interactively. The software identified small differences between the two samples that resulted from sherry cask aging. Because all of the information available from the hard and soft ionization analyses for each compound is summarized in a concise integrated report, the operator can rapidly determine the level of confidence for each assignment and inspect the information for compounds that are not present in the database.

Rapid Communications in Mass Spectrometry published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C9H10O4, Name: 4-Hydroxy-3,5-dimethoxybenzaldehyde.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Kanemoto, Kazuya published the artcileAcid-Mediated Sulfonylthiolation of Arenes via Selective Activation of SS-Morpholino Dithiosulfonate, Product Details of C11H10O, the publication is Organic Letters (2021), 23(5), 1582-1587, database is CAplus and MEDLINE.

A trifluoroacetic-acid-mediated desulfurilative sulfonylthiolation of arenes RH (R = 4-methoxyphenyl, thiophen-2-yl, 6-bromo-2-hydroxynaphthalen-1-yl, etc.) using SS-morpholino 4-toluene(dithioperoxo)sulfonate is described. This system is based on selective activation of the morpholino group over the tosyl group of the doubly transformable sulfur surrogate. Mechanistic studies suggested that the reaction proceeds through electrophilic aromatic substitution followed by sulfur extrusion. The wide substrate scope of this reaction and the transformability of the resulting thiosulfonates RSTs enable expeditious access to divergent multifunctionalized sulfides.

Organic Letters published new progress about 93-04-9. 93-04-9 belongs to ethers-buliding-blocks, auxiliary class Naphthalene,Ether, name is 2-Methoxynaphthalene, and the molecular formula is C11H10O, Product Details of C11H10O.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Chiesi Villa, A. published the artcileCrystal and molecular structure of α,α’-dithiobisformamidinium dichloride, Quality Control of 14807-75-1, the publication is Acta Crystallographica, Section B: Structural Crystallography and Crystal Chemistry (1972), 28(Pt. 2), 356-60, database is CAplus.

The crystal structure of α,α’-dithiobisformamidinium dichloride, [SC(NH2)22Cl2, was determined and refined by Fourier and least-squares methods using 3-dimensional x-ray data collected with a single-crystal diffractometer (Cu Kα). The unit-cell parameters are: a 8.78(1), b 10.52-(1), c 19.69(1) Å; Z 8. Space group: Pbca. All the H atoms were located directly. The dithiobisformamidinium cation is in a general position and is formed by 2 planar thiourea groups which are slightly rotated with respect to the S-S bond [2.017-(2) Å] : (SCNN)ƛ(SSC) = 6.9 and 15.6°. The internal rotation angle around the S-S bond is 92.3°. Bond distances and angles in the thiourea groups agree with those found in thiourea and its derivatives A comparison is made of the corresponding dithiobis-formamidinium dibromide and diiodide. Packing is determined by a system of H bonds of the type N-H…Cl [3.132(5), 3.181(6), 3.120(5), 3.142(6), 3.145(6), 3.150(6) Å].

Acta Crystallographica, Section B: Structural Crystallography and Crystal Chemistry published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Quality Control of 14807-75-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Katariya, Ashishkumar P. published the artcileIonic Liquid Promoted Regio-Selective Synthesis of 2-Methyl amino-3-Nitro-pyrano[3,2-c]chromen-5-ones, Related Products of ethers-buliding-blocks, the publication is ChemistrySelect (2022), 7(23), e202201295, database is CAplus.

An efficient, and simple protocol for the synthesis of extremely functionalized pyrano[3,2-c]chromen-5-ones has been developed. One-pot multicomponent cyclo-condensation of 4-hydroxycoumarin, aromatic-aldehydes, and (E)-N-methyl-1-(methylthio)-2-nitroethenamine (NMSM) catalyzed by ionic liquid [(EMIM)Ac] in two different methods as methanolic mediated and at solvent free condition is described which presumably involve the Knoevenagel reaction succeeding Michael-addition and O-cyclization with elimination of methanethiol. The noteworthy features of this protocol are use of ionic liquid as catalyst, good to excellent yield, optimum reaction time with easy exptl. procedure.

ChemistrySelect published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C9H10O4, Related Products of ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Yang, Yang published the artcileIncreasing contribution of microbial residues to soil organic carbon in grassland restoration chronosequence, Synthetic Route of 134-96-3, the publication is Soil Biology & Biochemistry (2022), 108688, database is CAplus.

Grassland restoration across the world increases soil organic carbon (SOC) sequestration which is critical for global C cycling and CO₂ removal from the atm. However, the relative importance of plant- and microbially-derived C for SOC is still an open question for temperate grasslands. Here, amino sugars and lignin phenols were used as biomarkers to investigate the relative microbial and plant residue contribution to SOC in a 30-yr (1-, 5-, 10-, 15-, 25-, 30-yr) restoration chronosequence of temperate grassland. The contribution of microbially-derived C (from 4.9 to 13 g kg^-1) to SOC was much greater than that of plant-derived C (from 1.3 to 2.3 g kg^-1). At the early stage of restoration (<15 years), grassland soils accumulated more C in the form of plant-derived C. In contrast, grassland soils at the late stage of restoration (>15 years) accumulated more microbially-derived C, and less from plant residues. These findings highlight the dominance of microbial contribution to SOC stabilization compared with plant residues. The contribution of bacteria-derived C to SOC gradually increased from 29% to 50% with progress of grassland restoration, while the contribution of fungal C to SOC decreased from 30% to 21%. Consequently, microbial residue contribution to SOC shifts from fungal and bacterial to mainly bacterial residues during grassland restoration. This shift may be due to the faster bacterial growth and a increasing living biomass during grassland restoration, leading to higher accumulation of bacterial residues. Correlation anal. and random forest models showed that belowground plant biomass, soil pH, and living microbial biomass were the main factors regulating plant-derived C. The microbially-derived C in SOC, however, was dependent on living microbial biomass, soil pH and dissolved organic C. Concluding, grassland restoration increased soil C sequestration primarily by microbial necromass (mainly bacterial necromass), and is affected by abiotic and biotic factors, as well as plant C input.

Soil Biology & Biochemistry published new progress about 134-96-3. 134-96-3 belongs to ethers-buliding-blocks, auxiliary class Immunology/Inflammation,COX,Natural product, name is 4-Hydroxy-3,5-dimethoxybenzaldehyde, and the molecular formula is C8H11BO3, Synthetic Route of 134-96-3.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Heilmann, S. M. published the artcileO-Hydroxyethylation of 1,1-dihydroperfluorinated alcohols, Name: 2-(2,2,2-Trifluoroethoxy)ethanol, the publication is Journal of Fluorine Chemistry (1992), 59(3), 387-96, database is CAplus.

A convenient transformation of 1,1-dihydroperfluorinated alcs. into O-hydroxyethyl derivatives (R_FCH₂OCH₂CH₂OH) is described in which ethylene carbonate is utilized as the alkylating agent. Tetraalkylammonium iodides and trialkylamines are effective catalysts.

Journal of Fluorine Chemistry published new progress about 2358-54-5. 2358-54-5 belongs to ethers-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-(2,2,2-Trifluoroethoxy)ethanol, and the molecular formula is C4H7F3O2, Name: 2-(2,2,2-Trifluoroethoxy)ethanol.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zhu, Guanxin published the artcileSelective C-C bonds formation, N-alkylation and benzo[d]imidazoles synthesis by a recyclable zinc composite, Name: (2-Methoxyphenyl)methanamine, the publication is Chinese Chemical Letters (2022), 33(1), 266-270, database is CAplus.

Earth abundant metals are much less expensive, promising, valuable metals and could be served as catalysts for the borrowing hydrogen reaction, dehydrogenation and heterocycles synthesis, instead of noble metals. The uniformly dispersed zinc composites were designed, synthesized and carefully characterized by means of XPS, EDS, TEM and XRD. The resulting zinc composite showed good catalytic activity for the N-alkylation of amines 2-R-3-R¹-4-R²-5-R³-C₆HNH₂ (R = H, Cl, Me; R¹ = H, Cl; R² = H, Cl, OMe; R³ = H, Me) with amines R⁴CH₂NH₂ (R⁴ = Ph, 2-methylphenyl, thiophen-2-yl, etc.), ketones R⁵C(O)CH₃ (R⁵ = Ph, 3-bromophenyl, naphthalen-2-yl, etc.;) with alcs. R⁶CH₂OH (R⁶ = Ph, 3,4-difluorophenyl, thiophen-2-yl, etc.) in water under base-free conditions, while unsaturated carbonyl compounds R⁵C(O)CH=CHR⁶ and R⁵C(O)(CH₂)₂R⁶ could also be synthesized by tuning the reaction conditions. Importantly, it was the first time to realize the synthesis of 2-aryl-1H-benzo[d]imidazole derivatives I (R⁷ = H, Cl, Me) by using this zinc composite under green conditions. Meanwhile, this zinc catalyst could be easily recovered and reused for at least five times.

Chinese Chemical Letters published new progress about 6850-57-3. 6850-57-3 belongs to ethers-buliding-blocks, auxiliary class Amine,Benzene,Ether, name is (2-Methoxyphenyl)methanamine, and the molecular formula is C11H17BN2O2, Name: (2-Methoxyphenyl)methanamine.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem