Month: December 2022

Trchunyan, A. A. published the artcileN,N’-dicyclohexylcarbodiimide-sensitive and potassium-dependent proton secretion from anaerobically grown E. coli, Recommanded Product: 1,1-Dimethylthiourea, the publication is Biofizika (1989), 34(2), 322-3, database is CAplus.

Dependence of N,N‘-dicyclohexylcarbodiimide (DCC)-sensitive H⁺ secretion on K⁺ activity was observed This dependence took place only in anaerobically grown Escherichia?coli and only at the structurally intact DCC-sensitive H⁺-ATPase complex and K⁺-ionophore Trk.

Biofizika published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C13H9FO2, Recommanded Product: 1,1-Dimethylthiourea.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Hedvati, Lilach published the artcileCinnamic acid derived oxazolinium ions as novel cytotoxic agents, Synthetic Route of 16909-09-4, the publication is European Journal of Medicinal Chemistry (2002), 37(7), 607-616, database is CAplus and MEDLINE.

Substituted cinnamoyl chlorides were converted into (2-hydroxyethyl)oxazolinium chlorides (I), N,N-bis-(2-chloroethyl)amides, and (2-chloroethyl)oxazolinium chlorides. Although I which possess electron-donating substituents (Me or MeO) were more potent than those substituted by electron-withdrawing groups (NO₂, Cl or CF₃), the difference in cytotoxic action was not significant. Modification of the lipophilic character in a series of alkoxy-substituted I led to more active compounds, the octyloxyphenyl derivative II being the most potent and displaying cytotoxic activity in the ¦ÌM range. It is assumed that the oxazolinium salts act as alkylating agents, and undergo nucleophilic attack on the methylene adjacent to the ring oxygen where the oxazolinium ring parallels the aziridinium ring intermediate found in classical alkylating agents.

European Journal of Medicinal Chemistry published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Synthetic Route of 16909-09-4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Levitsky, Harry published the artcileInfrared spectra of the nitration products of diphenylamine, HPLC of Formula: 1821-27-8, the publication is Applied Spectroscopy (1968), 22(5)(Pt. 1), 493-6, database is CAplus.

The ir spectra of the 19 nitration products of diphenylamine were established. A comparison was made of the spectra obtained, and assignments were made to the principal bands. The compounds considered were diphenylamine, N-nitrosodiphenylamine, 4-nitrosodiphenylamine, 2-nitrodiphenylamine, 4-nitrodiphenylamine, N-nitroso-2-nitrodiphenylamine, N-nitroso-4-nitrodiphenylamine, 2,2′-dinitrodiphenylamine, 2,4-dinitrodiphenylamine, 2,4′-dinitrodiphenylamine, 4,4′-dinitrodiphenylamine, N-nitroso-2,4′-dinitrodiphenylamine, N-nitroso-4,4′-dinitrodiphenylamine, 2,2′,4-trinitrodiphenylamine, 2,4,4′-trinitrodiphenylamine, 2,4,6-trinitrodiphenylamine, 2,2′,4,4′-tetranitrodiphenylamine, 2,2′,4,4′,6-pentanitrodiphenylamine, 2,2′,4,4′,6,6,’-hexanitrodiphenylamine, and picrid acid (2,4,6-trinitrophenol).

Applied Spectroscopy published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, HPLC of Formula: 1821-27-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Klingebiel, Uwe published the artcileFluorosilyl-substituted N,N- and N,O-bis(trimethylsilyl)hydroxylamines, Recommanded Product: Difluorodiphenylsilane, the publication is Journal of Organometallic Chemistry (1979), 179(4), 391-6, database is CAplus.

Fluoro- and aminofluorosilanes react with the Li salt on N,O-bis(trimethylsilyl)hydroxylamine with LiF elimination and substitution. Alkyl- and aminofluorosilanes give O-fluorosilyl-N,N-bis(trimethylsilyl)hydroxylamines, arylfluorosilanes give N-fluorosilyl-N,O-bis(trimethylsilyl)hydroxylamines. By the further reaction of O-difluorosilyl-N,N-bis(trimethylsilyl)hydroxylamine with the lithiated hydroxylamine, O,O‘-fluoromethylsilyldi[N,N-bis(trimethylsilyl)hydroxyalmine] is formed. On heating N-difluorophenylsilyl-N,O-bis(trimethylsilyl)hydroxylamine, di[fluorophenylsilyl(methyl)amino]pentamethylsiloxane is formed by Me group migration.

Journal of Organometallic Chemistry published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Recommanded Product: Difluorodiphenylsilane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Look, Kai published the artcileFormation by S_RN1 reactions and ¹H N.M.R. properties of sterically encumbered 2,4,6-trialkylphenyl p-nitrobenzyl sulfides, Safety of 2,4,6-Triisopropylbenzenethiol, the publication is Australian Journal of Chemistry (1999), 52(11), 1077-1083, database is CAplus.

Sterically hindered p-nitrobenzylic chlorides react with the sodium salts of 2,4,6-trialkylbenzenethiols by the S_RN1 reaction to give good yields of the corresponding p-nitrobenzylic aryl sulfides. For example, the reaction of sodium 2,4,6-triisopropylbenzenethiolate with ¦Á-t-butyl-¦Á-methyl-p-nitrobenzyl chloride gives the sulfide in over 80% yield after 2 h at room temperature in Me₂SO. Only in reactions involving 2,4,6-tri-t-butylbenzenethiol are low yields or failed reactions encountered. Qual. examination of the dynamic NMR spectra of the sulfides prepared in these reactions shows that up to three restricted rotational phenomena can be identified. These are rotation about the benzylic-carbon to p-nitrophenyl ring bond, rotation about the sulfur to aromatic ring bond, and rotation about the bond joining the t-Bu group to the benzylic carbon. The last phenomenon produces the relatively rare and unusual situation wherein the t-Bu group appears as three distinct Me resonances at low temperatures

Australian Journal of Chemistry published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Safety of 2,4,6-Triisopropylbenzenethiol.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Maia, Marcella T. published the artcileSilica Nanoparticles and Surface Silanization for the Fabrication of Water-Repellent Cotton Fibers, HPLC of Formula: 13822-56-5, the publication is ACS Applied Nano Materials (2022), 5(4), 4634-4647, database is CAplus.

Water-repellent and anticorrosive superhydrophobic cotton fabrics were produced via an eco-friendly water-based coating with core-shell fluorescent silica nanoparticles (SiPs) and subsequent immersion in a mixture of two fluorine-free organosilanes (3-(aminopropyl)trimethoxysilane and trimethoxy(octadecyl)silane). Transmission electron microscopy confirmed the spherical and core-shell structure of SiPs, and Fourier-transform IR spectroscopy characterized their chem. composition SEM with energy-dispersive X-ray spectroscopy confirmed the high coating coverage even after realistic laundering cycles. In confocal laser scanning microscopy, the fluorescent core-shell SiPs were used as probes to characterize the coating coverage on the surface of the cotton fibers. The high fluorescent signal provided by the fluorescent core-shell SiP cores enabled their visualization over large surface areas of the modified cotton fibers, before and after several washing cycles. The hydrophobic property of the cotton fiber treatments was evaluated considering the type of particle coating (monolayer or hierarchization), covalent bond with silanes, and a final curing process. Monolayer coating with fluorescent core-shell SiPs and further silanization yielded cotton fibers with high hydrophobicity and excellent durability (tested up to 10 washing processes), maintaining water contact angle (WCA) values above 150¡ã, repellency grade 3, and lower water uptake (165%) compared to pristine (600%) or silanized cotton fibers (340%). Principal component anal. showed that the silanization process increased the SiP-coated cotton fiber resistance to laundering sustaining nonwetting properties up to 10 washing cycles, which was not observed for SiP-coated fibers subjected to no silanization process. Addnl., the silanized and noncured SiP-coated fibers were tested against solvents and corrosive aqueous media, for which high resistance to toluene, chloroform, and strong acid was observed, with the maintenance of static and dynamic WCAs. Thus, this systematic study allowed us to verify the main factors associated with superior hydrophobicity and durability and achieve an optimized and less toxic approach that combines the deposition of fluorescent core-shell SiPs and binary silanization.

ACS Applied Nano Materials published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, HPLC of Formula: 13822-56-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhou, Hailin published the artcileSerum untargeted lipidomics by UHPLC-ESI-HRMS aids the biomarker discovery of colorectal adenoma, Quality Control of 6217-54-5, the publication is BMC Cancer (2022), 22(1), 314, database is CAplus and MEDLINE.

Colorectal adenoma (CA) is an important precancerous lesion and early screening target of colorectal cancer (CRC). Lipids with numerous physiol. functions are proved to be involved in the development of CRC. However, there is no lipidomic study with large-scale serum samples on diagnostic biomarkers for CA. The serum lipidomics of CA patients (n = 50) and normal control (NR) (n = 50) was performed by ultra high performance liquid chromatog.-high resolution mass spectrometry with electrospray ionization (UHPLC-ESI-HRMS). Univariate and multivariate statistical analyses were utilized to screen the differential lipids between groups, and combining the constituent ratio anal. and diagnostic efficiency evaluation by receiver operating characteristic (ROC) curve disclosed the potential mechanism and biomarkers for CA. There were obvious differences in serum lipid profiles between CA and NR groups. Totally, 79 differential lipids were selected by criterion of P < 0.05 and fold change > 1.5 or < 0.67. Triacylglycerols (TAGs) and phosphatidylcholines (PCs) were the major differential lipids with ratio > 60%, indicating these two lipid metabolic pathways showed evident disequilibrium, which could contribute to CA formation. Of them, 12 differential lipids had good diagnostic ability as candidate biomarkers for CA (AUC ¡Ý 0.900) by ROC anal. To our knowledge, this is the first attempt to profile serum lipidomics and explore lipid biomarkers of CA to help early screening of CRC. 12 differential lipids are obtained to act as potential diagnostic markers of CA. PCs and fatty acids were the main dysregulated biomarkers for CA in serum.

BMC Cancer published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C10H9NO4S, Quality Control of 6217-54-5.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ashikari, Yosuke published the artcileIntegrated Electrochemical-Chemical Oxidation Mediated by Alkoxysulfonium Ions, SDS of cas: 457-68-1, the publication is Journal of the American Chemical Society (2011), 133(31), 11840-11843, database is CAplus and MEDLINE.

Generation of carbocations by the cation pool method followed by reaction with DMSO gave the corresponding alkoxysulfonium ions. Alkoxysulfonium ions could also be generated by in situ DMSO trapping of electrochem. generated carbocations. The resulting alkoxysulfonium ions were transformed into carbonyl compounds by treatment with triethylamine. The present integrated electrochem.-chem. oxidation can be applied to the oxidation of diarylmethanes to diaryl ketones, toluenes to benzaldehydes, and aryl-substituted alkenes to 1,2-diketones. Also, the oxidation of unsaturated compounds bearing a nucleophilic group in an appropriate position gives cyclized carbonyl compounds

Journal of the American Chemical Society published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C13H10F2, SDS of cas: 457-68-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Niihara, Ken-ichi published the artcileCellulose nanofibril/polypropylene composites prepared under elastic kneading conditions, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine, the publication is Cellulose (Dordrecht, Netherlands) (2022), 29(9), 4993-5006, database is CAplus.

An aqueous dispersion of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofibrils (TEMPO-CNFs) was mixed with diethylene glycol (DEG) and dodecyltrimethylammonium chloride (DTMACl) with or without silane coupling agents. The mixture was heated at 40 ¡ãC for 1 d to prepare an oven-dried TEMPO-CNF/DEG/DTMACl, which was added to maleic anhydride-modified polypropylene (MA-PP) and kneaded at 165-175 ¡ãC with high shear forces to prepare TEMPO-CNF/MA-PP master batches. Various amounts of TEMPO-CNF/MA-PP master batch pieces were mixed with PP to prepare TEMPO-CNF/MA-PP/PP composite sheets. The yield stress and storage modulus at 25 ¡ãC of the composite sheets increased almost linearly with an increase in TEMPO-CNF content. However, the elongation at break decreased clearly with TEMPO-CNF content because of partial formation of TEMPO-CNF aggregates in the composites. The presence of TEMPO-CNFs restricted flow behavior of the MA-PP/PP components above 160 ¡ãC, although the crystallinities and melting behavior of MA-PP/PP in the composite sheets at ? 160 ¡ãC were unchanged. The apparent aspect ratios of TEMPO-CNF components in the composite sheets were 5-13 by partial aggregation of TEMPO-CNFs in the PP matrix, although the aspect ratio of the original TEMPO-CNFs dispersed in water was ? 183. The aggregation behavior of TEMPO-CNFs in the PP matrix may have resulted in brittle tensile properties of the composite sheets. The TEMPO-CNF-containing PP sheets have better printability and adhesion performance between sheets using glues. These results indicate that the oven-dried TEMPO-CNFs can be used as fillers for improvement of mech., thermal, and printing properties of recycled and low-quality PP and for quant. expansion of recycled PP.

Cellulose (Dordrecht, Netherlands) published new progress about 13822-56-5. 13822-56-5 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is 3-(Trimethoxysilyl)propan-1-amine, and the molecular formula is C6H17NO3Si, Recommanded Product: 3-(Trimethoxysilyl)propan-1-amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Arasappan, Ashok published the artcileP2-P4 Macrocyclic inhibitors of hepatitis C virus NS3-4A serine protease, Synthetic Route of 1860-58-8, the publication is Bioorganic & Medicinal Chemistry Letters (2006), 16(15), 3960-3965, database is CAplus and MEDLINE.

Synthesis and HCV NS3 serine protease inhibitory activity of 4-hydroxyproline derived macrocyclic inhibitors and SAR around this macrocyclic core is described in this communication. X-ray structure of inhibitor I bound to the protease is discussed.

Bioorganic & Medicinal Chemistry Letters published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, Synthetic Route of 1860-58-8.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia