Day: November 21, 2022

Ke, Ming-Kun published the artcileInterface-Promoted Direct Oxidation of p-Arsanilic Acid and Removal of Total Arsenic by the Coupling of Peroxymonosulfate and Mn-Fe-Mixed Oxide, Recommanded Product: 2,2,6,6-Tetramethylpiperidin-4-one, the publication is Environmental Science & Technology (2021), 55(10), 7063-7071, database is CAplus and MEDLINE.

As one of the extensively used feed additives in livestock and poultry breeding, p-arsanilic acid (p-ASA) has become an organoarsenic pollutant with great concern. For the efficient removal of p-ASA from water, the combination of chem. oxidation and adsorption is recognized as a promising process. Herein, hollow/porous Mn-Fe-mixed oxide (MnFeO) nanocubes were synthesized and used in coupling with peroxymonosulfate (PMS) to oxidize p-ASA and remove the total arsenic (As). Under acidic conditions, both p-ASA and total As could be completely removed in the PMS/MnFeO process and the overall performance was substantially better than that of the Mn/Fe monometallic system. More importantly, an interface-promoted direct oxidation mechanism was found in the p-ASA-involved PMS/MnFeO system. Rather than activate PMS to generate reactive oxygen species (i.e., SO₄^·-, ·OH, and ¹O₂), the MnFeO nanocubes first adsorbed p-ASA to form a ligand-oxide interface, which improved the oxidation of the adsorbed p-ASA by PMS and ultimately enhanced the removal of the total As. Such a direct oxidation process achieved selective oxidation of p-ASA and avoidance of severe interference from the commonly present constituents in real water samples. After facile elution with dilute alkali solution, the used MnFeO nanocubes exhibited superior recyclability in the repeated p-ASA removal experiments Therefore, this work provides a promising approach for efficient abatement of phenylarsenical-caused water pollution based on the PMS/MnFeO oxidation process.

Environmental Science & Technology published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Recommanded Product: 2,2,6,6-Tetramethylpiperidin-4-one.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Liang, Dongmin published the artcileHighly efficient catalytic ozonation for ammonium in water upon γ-Al₂O₃@Fe/Mg with acidic-basic sites and oxygen vacancies, Product Details of C9H17NO, the publication is Science of the Total Environment (2022), 155278, database is CAplus and MEDLINE.

Catalytic ozonation has prospects in the advanced treatment of nitrogen removal, and solid base MgO can efficiently catalyze the ozonation of ammonium nitrogen. However, it is necessary to improve the problem of easy loss, difficult recovery, and low percentage of gaseous products. Here, MgO, amorphous Fe₂O₃,and γ-Al₂O₃ were selected as dopingcomponents and supports, resp., to prepare γ-Al₂O₃@Fe/Mg composite catalysts with abundant acidic-basicsites and oxygen vacancies. The results show that γ-Al₂O₃@Fe/Mg₅ can efficiently catalyze the ozonation of ammonium nitrogen (98.73%) with 67.82% gaseous product selectivity under the conditions of initial pH = 7, catalyst dosage of 112.88 g/L, and ozone dosage of 2.4 mg/min. The doping of Fe₂O₃ and MgO with a weaker lattice oxygen binding energy improves the gaseous product selectivity. The mechanism of ammonium nitrogen removal for γ-Al₂O₃@Fe/Mg₅ is revealed, especially the intrinsic contribution of acidic-basic sites and oxygen vacancies. The pH and active sites play different roles in ozone decomposition for NH₄⁺ removal. Surface hydroxyl protonation on basic sites and oxygen vacancies and electron transfer on acidic sites are responsible for ozone decomposition to hydroxyl radicals. Moreover, γ-Al₂O₃@Fe/Mg₅ exhibits good stability, few leaching ions, and can be settled in waterfor easy recovery. This study suggests that γ-Al₂O₃@Fe/Mg₅ is a good candidate for the catalytic ozonation of ammonium nitrogen.

Science of the Total Environment published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C9H17NO, Product Details of C9H17NO.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Crich, David published the artcileDoes Neighboring Group Participation by Non-Vicinal Esters Play a Role in Glycosylation Reactions? Effective Probes for the Detection of Bridging Intermediates, Recommanded Product: 1-(Phenylsulfinyl)piperidine, the publication is Journal of Organic Chemistry (2008), 73(22), 8942-8953, database is CAplus and MEDLINE.

Neighboring group participation in glycopyranosylation reactions is probed for esters at the 3-O-axial and -equatorial, 4-O-axial and -equatorial, and 6-O-sites of a range of donors through the use tert-butoxycarbonyl esters. The anticipated intermediate cyclic dioxanyl cation is interrupted for the axial 3-O-derivative, leading to the formation of a 1,3-O-cyclic carbonate ester, with loss of a tert-Bu cation, providing convincing evidence of participation by esters at that position. However, no evidence was found for such a fragmentation of carbonate esters at the 3-O-equatorial, 4-O-axial and -equatorial, and 6-O positions, indicating that neighboring group participation from those sites does not occur under typical glycosylation conditions. Further probes employing a 4-O-(2-carboxy)benzoate ester and a 4-O-(4-methoxybenzoate) ester, the latter in conjunction with an ¹⁸O quench designed to detect bridging intermediates, also failed to provide evidence for participation by 4-O-esters in galactopyranosylation.

Journal of Organic Chemistry published new progress about 4972-31-0. 4972-31-0 belongs to piperidines, auxiliary class Piperidine,Benzene, name is 1-(Phenylsulfinyl)piperidine, and the molecular formula is C11H15NOS, Recommanded Product: 1-(Phenylsulfinyl)piperidine.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Liao, Hsin-Yu published the artcileDifferential Receptor Binding Affinities of Influenza Hemagglutinins on Glycan Arrays, Formula: C11H15NOS, the publication is Journal of the American Chemical Society (2010), 132(42), 14849-14856, database is CAplus and MEDLINE.

A library of 27 sialosides, including seventeen 2,3-linked and ten 2,6-linked glycans, has been prepared to construct a glycan array and used to profile the binding specificity of different influenza hemagglutinins (HA) subtypes, especially from the 2009 swine-originated H1N1 and seasonal influenza viruses. It was found that the HAs from the 2009 H1N1 and the seasonal Brisbane strain share similar binding profiles yet different binding affinities toward various α2,6 sialosides. Anal. of the binding profiles of different HA subtypes indicate that a min. set of 5 oligosaccharides can be used to differentiate influenza H1, H3, H5, H7, and H9 subtypes. In addition, the glycan array was used to profile the binding pattern of different influenza viruses. It was found that most binding patterns of viruses and HA proteins are similar and that glycosylation at Asn27 is essential for receptor binding.

Journal of the American Chemical Society published new progress about 4972-31-0. 4972-31-0 belongs to piperidines, auxiliary class Piperidine,Benzene, name is 1-(Phenylsulfinyl)piperidine, and the molecular formula is C11H15NOS, Formula: C11H15NOS.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Ruess, Raffael published the artcileEfficient Electron Collection by Electrodeposited ZnO in Dye-Sensitized Solar Cells with TEMPO⁺/⁰ as the Redox Mediator, Recommanded Product: 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate, the publication is Journal of Physical Chemistry C (2019), 123(36), 22074-22082, database is CAplus.

The power conversion efficiency in established dye-sensitized solar cells (DSSCs) suffers from high overpotentials needed because of slow electron transfer kinetics. If redox couples are used that have a low reorganization energy, fast dye regeneration can be achieved, but fast recombination reactions can barely be suppressed. If they become competitive to electron transport to the back electrode, solar cell efficiencies drastically drop. In this work, it is shown that electron transport is facilitated by substituting the commonly used photoanode material, nanoparticulate TiO₂, by electrodeposited ZnO, which, albeit more complex surface reactions, provides electron transport by orders of magnitude faster than nanoparticulate TiO₂. With TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) as the redox mediator, the dye is efficiently regenerated with overpotentials well below 0.2 V. We demonstrate that the external quantum efficiency with TiO₂-based photoanodes is significantly limited by recombination, while it is maintained at high values for electrodeposited ZnO. It is thereby shown that redox couples with fast kinetics can be employed in DSSCs without drawbacks in quantum efficiency if sufficient fast electron transport in the porous semiconductor network is provided.

Journal of Physical Chemistry C published new progress about 219543-09-6. 219543-09-6 belongs to piperidines, auxiliary class Piperidine,Fluoride,Salt,Amine,Amide, name is 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate, and the molecular formula is C11H21BF4N2O2, Recommanded Product: 4-Acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium Tetrafluoroborate.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Litjens, Remy published the artcileSynthesis of an α-Gal epitope α-D-Galp-(1â†?)-β-D-Galp-(1â†?)-β-D-Glcp NAc-lipid conjugate, Category: piperidines, the publication is Journal of Carbohydrate Chemistry (2005), 24(7), 755-769, database is CAplus.

The synthesis of a neoglycoconjugate containing the Galili epitope trisaccharide connected to a spacer-lipid entity is described. The α-D-Galp-(1â†?)-β-D-Galp-(1â†?)-β-D-GlcpNAc trisaccharide, equipped with a 3-aminopropyl spacer, is efficiently assembled from easily accessible building blocks in a one-pot procedure. Global deprotection of the trisaccharide and ensuing introduction of a bis(palmitamido)-propanamido moiety afforded title trisaccharide.

Journal of Carbohydrate Chemistry published new progress about 4972-31-0. 4972-31-0 belongs to piperidines, auxiliary class Piperidine,Benzene, name is 1-(Phenylsulfinyl)piperidine, and the molecular formula is C11H15NOS, Category: piperidines.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Zhang, Congyu published the artcileComparative indexes, fuel characterization and thermogravimetric- Fourier transform infrared spectrometer-mass spectrogram (TG-FTIR-MS) analysis of microalga Nannochloropsis Oceanica under oxidative and inert torrefaction, Category: piperidines, the publication is Energy (Oxford, United Kingdom) (2021), 120824, database is CAplus.

The torrefaction performances of microalga Nannochloropsis Oceanica under oxidative and inert atmospheres are characterized and compared with each other based on several operating parameters. By conducting several comparative indexes, the results suggest that oxidative torrefaction is more capable of upgrading microalgae due to its relatively lower solid yield and energy input, as well as relatively higher enhancement factor and upgrading energy index. Compared to inert torrefaction, the indexes indicate that oxidative torrefaction at 250°C for 30 min has higher energy yield (1.02 times) and energy efficiency (2.2 times) but whereas lower energy input (0.4 times). With increasing torrefaction severity, the pyrolysis curve gradually becomes smooth and shift to a high-temperature zone. The peak temperatures of torrefied microalgae present an increasing trend, especially in the oxidative atm. After oxidative torrefaction, microalgal solid biofuel is upgraded as peat and lignite, from the viewpoint of elemental composition Furthermore, oxidative torrefaction is more suitable than inert torrefaction for producing bio-oil which mainly contains dianhydromannitol, neophytadiene, and palmitoleic acid. The TG-FTIR-MS results uncover the pyrolysis characteristics and reactivity of torrefied microalgae, and elucidate that oxidative torrefied microalgae is more reactive.

Energy (Oxford, United Kingdom) published new progress about 826-36-8. 826-36-8 belongs to piperidines, auxiliary class Natural product, name is 2,2,6,6-Tetramethylpiperidin-4-one, and the molecular formula is C7H7ClN2S, Category: piperidines.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Ueki, Akiharu published the artcileStereoselective synthesis of benzyl-protected β-galactosides by propionitrile-mediated glycosylation, Synthetic Route of 4972-31-0, the publication is Tetrahedron (2008), 64(11), 2611-2618, database is CAplus.

β-Selective galactosylation was studied using a series of 2-O-benzylated Ph 1-thio-galactosides and glycosyl acceptors in propionitrile with BSP-TTBP-Tf₂O. The glycosylation enabled us to synthesize useful precursors of N-acetyl-lactosamine and core O-glyco-serine derivatives in a highly convergent manner.

Tetrahedron published new progress about 4972-31-0. 4972-31-0 belongs to piperidines, auxiliary class Piperidine,Benzene, name is 1-(Phenylsulfinyl)piperidine, and the molecular formula is C15H14Cl2S2, Synthetic Route of 4972-31-0.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Drefahl, G. published the artcileAmino alcohols. XX. Preparation of 1-substituted 2-piperidino-1-cyclohexanols, Product Details of C7H16N2, the publication is Journal fuer Praktische Chemie (Leipzig) (1966), 32(1-2), 69-86, database is CAplus.

cf. CA 64, 19600c. A series of cis- and trans-isomers of 1-substituted 2-piperidinocyclohexanols (I) was prepared 2-Chlorocyclohexanone (160 g.) added with stirring to refluxing 205 g. piperidine and 200 cc. MePh, heated 2 hrs. at 140° (bath), cooled, and treated with 300 cc. 5% NH₄OH yielded 85-90 g. 2-piperidinocyclohexanone (II), b₃ 95-7°; II.HCl, m. 202-5° (EtOH-dioxane). II (0.1 mole) in 150 cc. dry Et₂O added dropwise with cooling and stirring to 0.7 mole appropriate Grignard reagent in 250 cc. dry Et₂O under argon and heated 1-2 hrs. at about 50° yielded the corresponding cis-I. The Grignard derivative from 0.6 mole alkyl or aryl halide and 15 g. Mg in 250 cc. dry Et₂O treated under argon with stirring and cooling with 0.4 mole cyclohexanone in an equivalent amount Et₂O slowly during about 6-8 hrs. and kept overnight, and the crude product heated 2-3 hrs. at 130-150° in the presence of a few crystals iodine yielded the following 1-substituted cyclohexenes (substituent, b.p./mm., and % yield given): iso-Bu, 169-71°/750, 18; cyclopentyl, 87-9°/ 12, 32; p-cumenyl, 148-52°/13, 35; p-PhC₆H₄, 180-2°/1.5 [m.p. 145-6° (iso-PrOH-C₆H₆), greenish blue fluorescence]. The appropriate III in about 2 volumes dry Et₂O added with stirring and cooling to 0.5-0.6M o-HO₂CC₆H₄CO₂OH gave the corresponding 1-substituted 1,2-epoxycyclohexane (IV). The appropriate III (1 mole) added dropwise with stirring below 20° to 1 mole N-bromosuccinimide in 400 cc. H₂O containing 1 cc. AcOH, stirred about 1 hr., and evaporated, and the oily, black-brown residue added dropwise at room temperature to 1 equivalent absolute KOH-MeOH and heated 0.5 hr. at 60° (bath) gave the corresponding IV. By these methods were prepared the following IV (R and b.p./mm. given): H 36-9°/25, Me 37-9°/14, Et 51-3°/14, Pr 62-4°/12, Bu 41-4°/1, Am 75-80°/3, iso-Pr 59-62°/12, iso-Bu 47-51°/2-3, iso-Am 67-71°/2-3, tert-Bu 64-8°/13, cyclopentyl 102-3°/12, cyclohexyl 117-18°/12 (m. 10-11°), Ph 131-3°/12, PhCH₂ 136-8°/12, PhCH₂CH₂ 151-3°/12, p-MeC₆H₄ 90-5°/0.4, p-cumenyl 102-10°/0.5, o-MeC₆H₄ 79-84°/0.4, 1-C₁₀H₇ 138-42°/ 0.6 (m. 61-3°). R, b.p./mm., n²⁰_D, % yield, m.p. of HCl salt; Me, 83-4°/0.6, 1.4914, 69, 198-200° (EtOH-dioxane); Et, 114-15°/1.3, 1.4933, 46, 189-92° (Me₂CO-petroleum ether); Pr, 118-21°/1-1.1, 1.4895, 55, 163-6° (Me₂CO-petroleum ether); Bu, 127-8°/0.9, 1.4882, 38, 182-4° (Me₂CO); Am, 136-7°/0.8, 1.4871, 59, 191-4°; iso-Pr, 116-17°/1, 1.4944, 55, 208-10°; iso-Bu, 128-30°/1.6, 1.4874, 72, 193-5°; iso-Am, 132-3°/0.8, 1.4864, 73, 198-200°; tert-Bu, 118-19°/0.6, 1.4981, 21, 182-3°; cyclopentyl, 142-3°/0.7, 1.5111, 24, 220-2° (iso-PrOH); cyclohexyl, 151-2°/0.7 (m. 51-3°), 1.5103, 33, 231-3° (iso-PrOH); Ph, 158-60°/0.7 (m. 65-6°), 1.5423, 39, 237-9° (Bu₂O-EtOH); PhCH₂, 166-7°/0.6, 1.5432, 85, 234-6° (iso-PrOH); PhCH₂CH₂, 172-3°/0.5, 1.5362, 89, 210-12° (EtOH-dioxane); p-MeC₆H₄, 160-1°/0.8 (m. 54-5°), 1.5400, -, 247-9°; p-cumenyl, 168-9°/0.6, 1.5300, 66, 202-5° (iso-PrOH); p-PhC₆H₄, 214-18°/0.4 (m. 105-7°), -, 70, 231-4° (absolute EtOH); o-MeC₆H₄, 155-6°/0.6, 1.5398, 79, 265-6°; 1-C₁₀H₇, 204-5°/0.8 (m. 106-7°), -, 50, 220-3° (EtOH-Et₂O) The appropriate IV and excess piperidine in 95% EtOH heated in a sealed tube or in an autoclave gave the corresponding trans-I. The crude cis- or traus-I in the 8-10 fold amount dry Et₂O treated dropwise at 0-5° with the equivalent amount HCl-Et₂O yielded the I.HCl. II in EtOH hydrogenated 3 hrs. at 65°/65 atm. yielded 66% cis-I (R = H), m. 93-4° (50% EtOH); HCl salt, m. 287-8° (iso-PrOH). R, b.p./mm., m.p., n²⁰_D, % yield, m.p. of HCl salt, moles piperidine used/mole IV, reaction time (hrs.), temperature; H, 82-5°/0.5, 35-6°, 1.4890, 46, 263-6°, 5, 5-6, 130°; Me, 97-8°/1, 43-4°, 1.4887, 37, 263-4°, 5, 6-8, 150°; Et, 110-12°/1.3, -, 1.4886, 59, 233-4°, 5, 6-8, 150°; Pr, 122-5°/1-1.2, 63-4°, 1.4886, 45, 217-18°, 5, 6-8, 150°; Bu, 131-3°/1, 52-3°, 1.4875, 40, 225-7°, 5, 6-8, 150°; Am, 146-8°/1.3, 37-9°, 1.4862, 19, 232-3°, 5, 6-8, 150°; iso-Pr, 116-17°/1, -, 1.4944, 55, 211-13°, 5, 8-9, 150°; iso-Bu, 113-14°/0.6, -1.4857, 12, 230-2°, 5, 10-11, 150°; iso-Am, 127-8°/0.6, 48-50°, 1.4843, 56, -, 5, 6-8, 150°; tert-Bu, 132-4°/1.3, -, 1.5072, 3.5, 178-80°, 8, 11-12, 150°; cyclopentyl, 140-1°/0.5, -, 1.5108, 40, 168-71°, 5, 7-9, 160°; cyclohexyl, 150-1°/0.6, -, 1.5140, 55, 218-19°, 5, 11-12, 180°; Ph, 158-9°/0.8, -, 1.5471, 30, 216-18°, 5, 5-6, 150°; PhCH₂, -, 121-2°, -, 25, -, 5, 6-7, 150°; PhCH₂CH₂, -, 103-5°, -, 38, 239-41°, 5, 7-8, 160°; p-MeC₆H₄, 163-9°/0.4, 106-9°, -, 2.4, 284-6°, 8, 10-11, 175°; p-cumenyl, 150-3°/0.4, -, -, 2, 277-9°, 8, 10-11, 175°; o-MeC₅H₄, 135-6°/0.2, -, 1.5532, 3.7, 196-9°, 8, 9-10, 190°; 1-C₁₀H₇, 196-8°/0.3, 96-8°, -, 14, 166-9°, 15, 9-10, 220° By the general method described were prepared the cis-I listed in the 1st table. By the general method were prepared the trans-I listed in the 2nd table.

Journal fuer Praktische Chemie (Leipzig) published new progress about 14613-37-7. 14613-37-7 belongs to piperidines, auxiliary class Piperidine,Amine, name is (1-Methylpiperidin-3-yl)methanamine, and the molecular formula is C7H16N2, Product Details of C7H16N2.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem

Hammer, Charles F. published the artcileIsolation of a bicyclic aziridinium ion intermediate, Application of 1-Ethylpiperidin-3-ol, the publication is Chemical Communications (London) (1966), 919-20, database is CAplus.

cf. Ebnoether and Jucker, CA 60, 15830b. 1-Azabicyclo [3.1.0]-hexane in dry Et2O and EtClO4 in absolute EtOH gave a semi-solid, extraction of which with CH2Cl2 gave a product whose N.M.R. spectrum was similar to the N.M.R. spectrum of the oil obtained from 3-chloro-N-ethylpiperidine and AgClO4 in dry Me2CO; and presumably, based on the spectrum, the product possesses the bicyclic aziridinium structure (I).

Chemical Communications (London) published new progress about 13444-24-1. 13444-24-1 belongs to piperidines, auxiliary class Piperidine,Alcohol, name is 1-Ethylpiperidin-3-ol, and the molecular formula is C7H15NO, Application of 1-Ethylpiperidin-3-ol.

Referemce:
https://en.wikipedia.org/wiki/Piperidine,
Piperidine | C5H11N – PubChem