Catalysis-chemistry

Vo-Dinh, Tuan published the artcileSurface-enhanced Raman scattering for medical diagnostics and biological imaging, Application In Synthesis of 10510-54-0, the publication is Journal of Raman Spectroscopy (2005), 36(6/7), 640-647, database is CAplus.

The authors present recent development and applications of a surface-enhanced Raman scattering (SERS) technol. for use in medical diagnostics and biol. imaging. For medical diagnostics, they use Raman-active dye-labeled DNA gene probes and nanostructured metallic substrates as SERS-active platforms. The surface-enhanced Raman gene probes can be used to detect DNA biotargets (e.g. gene sequences, bacteria and viral DNA) via hybridization to DNA sequences complementary to these probes. The SERS gene probes eliminate the need for radioactive labels and have great potential to provide both sensitivity, selectivity and label multiplexing for DNA sequencing and clin. assays. The authors also describe a hyperspectral surface-enhanced Raman imaging (HSERI) system that combines imaging capabilities with SERS detection to identify cellular components with high spatial and temporal resolution The HSERI system’s application to biol. imaging is demonstrated using Raman dye-labeled silver nanoparticles in cellular systems.

Journal of Raman Spectroscopy published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C4Br2N2O4S, Application In Synthesis of 10510-54-0.

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

Iida, Hirotada published the artcileStudies on the base-catalyzed reaction. VII. The reactions of p-nitroaniline with nitrobenzene derivatives in strongly basic solutions, Synthetic Route of 1821-27-8, the publication is Nippon Kagaku Kaishi (1976), 138-43, database is CAplus.

P-nitroaniline is ionized by Me3COK in (Me2N)3PO to form p-nitrophenylamide ion, which gives rise to nucleophilic substitution with PhNO2 derivatives on the substituent and on the hydrogen atom. The latter, occurring in the ortho or para position to the NO2 group, was recognized in almost every reaction under various conditions. In the former type of the reaction, the meta substituent was not affected, but the ortho or para substituents were favorably displaced. Under such conditions as giving both types of substitution, the former type of substitution was predominant if less Me3COK was used. The latter type of substitution was preferred when more Me3COK was used. The mechanisms of both types of substitution are suggested from the structure of the products and ESR.

Nippon Kagaku Kaishi 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, Synthetic Route of 1821-27-8.

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

He, Qiyuan published the artcilePalladium-Catalyzed Site-Selective [5 + 1] Annulation of Aromatic Amides with Alkenes: Acceleration of ¦Â-Hydride Elimination by Maleic Anhydride from Palladacycle, Name: 2-Methylbenzoic acid, the publication is ACS Catalysis (2022), 12(2), 1595-1600, database is CAplus.

The palladium-catalyzed reaction of 2-methylbenzamides with acrylic esters, leading to the production of isoquinolinones, is reported. The reaction occurs exclusively at the ortho Me C-H bond via a six-membered palladacycle and not at the ortho C-H bond via a five-membered palladacycle. A key to the success of the reaction is the use of maleic anhydride as a ligand. Computational analyses suggest that the coordination of the maleic anhydride ligand highly stabilizes the transition state for ¦Â-hydride elimination and accelerates the ¦Â-hydride elimination.

ACS Catalysis published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C8H8O2, Name: 2-Methylbenzoic acid.

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

Zhao, Kuo published the artcileCatalytic Ring Expansions of Cyclic Alcohols Enabled by Proton-Coupled Electron Transfer, Safety of 2,4,6-Triisopropylbenzenethiol, the publication is Journal of the American Chemical Society (2019), 141(22), 8752-8757, database is CAplus and MEDLINE.

In the presence of an iridium photocatalyst and tetraphenylphosphonium trifluoroacetate or di-Ph phosphate or collidine, alkenyl-substituted cyclic and heterocyclic alcs. such as I (R = H, Ph, 4-t-BuC₆H₄, 4-MeO₂CC₆H₄) underwent regioselective photochem. one- and two-carbon ring expansion reactions under blue LED irradiation via proton-coupled electron transfer to yield cyclic ketones such as II and III (R = Ph, 4-t-BuC₆H₄, 4-MeO₂CC₆H₄). When an aryl substituent was present at the terminal position of the alkenyl moiety, one-carbon ring expansion was observed, while when an alkyl substituent or a proton was present, two-carbon ring expansion occurred exclusively.

Journal of the American Chemical Society 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 C22H18O2, Safety of 2,4,6-Triisopropylbenzenethiol.

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

Dan, Shigeki published the artcileCapability of Artemia to digest Chlorella vulgaris and Nannochloropsis oculata under stagnant culture conditions, Application In Synthesis of 6217-54-5, the publication is Aquaculture Research (2022), 53(12), 4316-4326, database is CAplus.

The microalgae genera Chlorella and Nannochloropsis are commonly used as foods for rotifer culture and its nutritional enrichment materials. However, Artemia nauplii and early metanauplii cannot easily digest these genera because of their thick cell walls, and the conditions under which Artemia can digest them remain unclear. We investigated the size at which Artemia is capable of digesting these microalgae and the effects of Chlorella supply on Artemia fatty acid composition Decreased microalgae cell densities in culture water were observed after Artemia reached 1.6 mm in total length for Chlorella and 1.1 mm for Nannochloropsis, but the rate of decrease was slow and excrement from Artemia was filled with intact microalgae cells, suggesting that Artemia can ingest microalgae but cannot digest them. The d. of residual microalgae decreased linearly after Artemia reached 3.2 mm for Chlorella and 2.0 mm for Nannochloropsis, and the excrement contained broken cells, indicating true digestive performance. The absorption of fatty acids of Chlorella by the Artemia was detected after Artemia reached 3.5 mm in total length. These results suggest that Artemia acquires the ability to consume microalgae in a stepwise manner depending on the growth and species of microalgae.

Aquaculture Research 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 C22H32O2, Application In Synthesis of 6217-54-5.

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

Makino, Takeshi published the artcileConcise synthesis of diborylxanthenes, Recommanded Product: Trimethyl(perfluorophenyl)silane, the publication is Synthesis (2008), 859-864, database is CAplus.

A simple and efficient synthesis of bidentate diborylxanthene derivatives is described involving cross-coupling and ipso-substitution reactions. E.g., silylation of dimethylxanthene (I; X = H) by sequential treatment with BuLi/TMEDA and Me₃SiCl gave 86% I (X = SiMe₃), which upon treatment with BBr₃ and then with H₂O gave 96% I [X = B(OH)₂].

Synthesis published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Recommanded Product: Trimethyl(perfluorophenyl)silane.

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

Park, Hongsun published the artcileHornerin deposits in neuronal intranuclear inclusion disease: direct identification of proteins with compositionally biased regions in inclusions, SDS of cas: 63-68-3, the publication is Acta Neuropathologica Communications (2022), 10(1), 28, database is CAplus and MEDLINE.

Neuronal intranuclear inclusion disease (NIID) is a neurodegenerative disorder, characterized by the presence of eosinophilic inclusions (NIIs) within nuclei of central and peripheral nervous system cells. This study aims to identify the components of NIIs, which have been difficult to analyze directly due to their insolubility In order to establish a method to directly identify the components of NIIs, we first analyzed the huntingtin inclusion-rich fraction obtained from the brains of Huntington disease model mice. Although the sequence with expanded polyglutamine could not be identified by liquid-chromatog. mass spectrometry, amino acid anal. revealed that glutamine of the huntingtin inclusion-rich fraction increased significantly. This is compatible with the calculated amino acid content of the transgene product. Therefore, we applied this method to analyze the NIIs of diseased human brains, which may have proteins with compositionally biased regions, and identified a serine-rich protein called hornerin. Since the analyzed NII-rich fraction was also serine-rich, we suggested hornerin as a major component of the NIIs. A specific distribution of hornerin in NIID was also investigated by Matrix-assisted laser desorption/ionization imaging mass spectrometry and immunofluorescence. Finally, we confirmed a variant of hornerin by whole-exome sequencing and DNA sequencing. This study suggests that hornerin may be related to the pathol. process of this NIID, and the direct anal. of NIIs, especially by amino acid anal. using the NII-rich fractions, would contribute to a deeper understanding of the disease pathogenesis.

Acta Neuropathologica Communications published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C5H11NO2S, SDS of cas: 63-68-3.

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

Kawakami, Yukio published the artcileSynthesis and complexation of an optically active aza crown ether, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Bulletin of the Institute for Chemical Research, Kyoto University (1983), 61(2), 117-19, database is CAplus.

Ethanolamine I was condensed with o-phenylenedioxyacetic acid or its p-nitrophenyl ester to give diamide II, which was cyclized with o-(BrCH₂)₂C₆H₄ in the presence of NaH to give aza crown ether III. The cation binding of III with Li, Na, and Mg perchlorates was assessed by CD and NMR spectra in MeCN.

Bulletin of the Institute for Chemical Research, Kyoto University published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C10H10O6, Recommanded Product: 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Hattori, Tomohiro published the artcileSynthesis of silacyclic dipeptides: Peptide elongation at both N- and C-termini of dipeptide, Name: Fmoc-Pro-OH, the publication is Journal of the American Chemical Society (2022), 144(4), 1758-1765, database is CAplus and MEDLINE.

A new type of peptide bond formation utilizing silacyclic amino acids or peptides is described. This work has the following advantages: (1) imidazolylsilane is a highly fascinating coupling reagent for dipeptide synthesis from N-,C-terminal unprotected amino acids with amino acid tert-Bu esters; (2) deprotection of the tert-Bu ester at the C-terminus and cyclization sequentially proceed depending on reaction conditions to afford novel silacyclic dipeptides; (3) the cyclized products show a remarkable capacity as substrates of peptide elongation because the silacyclic compounds can act as both nucleophiles and electrophiles, and this capacity lead to one-pot site-selective tetra- and oligopeptide syntheses. These innovative advantages will help to simplify classical peptide synthesis significantly.

Journal of the American Chemical Society published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Name: Fmoc-Pro-OH.

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

Asano, Michizo published the artcileThe fate of branched-chain fatty acids in the animal body. I. A contribution to the problem of Hildebrandt acid, Recommanded Product: 2-Butylhexanoic acid, the publication is Journal of Biochemistry (1950), 321-27, database is CAplus.

cf. C.A. 44, 2626g; following abstract From rabbits administered with branched-chain fatty acids 48 hrs.’ urine was collected. 8.5 g. of l-rhodinic acid (b₉ = 139-140¡ã, [¦Á]¹⁵_D = -6.44¡ã, n²⁶_D = 1.4578) resulted in excretion of 3.45 g. of an acid (I), b_0.2 = 174-186¡ã, m.p. = 102-103.5¡ã, (from water), [¦Á]_D = -13.5¡ã, and 45.05% of COOH calculated for C₁₀H₁₆O₄. From 10 g. of administered d-citronellic acid (b₁₁ = 141-3¡ã, [¦Á]_D = +6.31¡ã) there was obtained 6.07 g. of a viscous liquid (II), b_1.2 = 165-190¡ã, m.p. = 103-4¡ã [¦Á]_D = +15.6¡ã, and 45.03% of COOH calculated for C₁₀H₁₆O₄. From 11 g. of d-citronellal (b₁₇ = 97¡ã, [¦Á]_D = -3.64¡ã, n¹³_D = 1.4518), 2.33 g. of an acid (III) was isolated, showing b_0.05 = 160-180¡ã, m.p. = 103-4¡ã, and [¦Á]_D = +15.3¡ã. From 22 g. of geraniol (b₁₇ = 120-2¡ã, n¹³_D = 1.4755, [¦Á]_D = -2.89¡ã), 5 g. of a viscous liquid (IV), b_1.5 = 170-95¡ã, was obtained, and further fractionated into two parts: water-insoluble part (V), crystallized from alc., which showed m.p. = 190-1¡ã; water-insoluble part, m.p. = 102-4¡ã, [¦Á]_D = +14.1¡ã, and 44.89% of COOH calculated for C₁₀H₁₆O₄. By mixed m.p. determinations, it was proved that V was Hildebrandt acid, while II, III, and IV were identical with dihydro-Hildebrandt acid, and I corresponded to the latter’s optical antipode.

Journal of Biochemistry published new progress about 3115-28-4. 3115-28-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is 2-Butylhexanoic acid, and the molecular formula is C10H20O2, Recommanded Product: 2-Butylhexanoic acid.

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