Month: November 2022

Li, Xinling published the artcileSize-fractionated nonpolar organic compounds of traffic aerosol emissions in a highway tunnel, Related Products of catalysis-chemistry, the publication is Environmental Pollution (Oxford, United Kingdom) (2022), 118501, database is CAplus and MEDLINE.

Size-fractionated aerosol samples (PM0.25, PM0.25-1, PM1-2.5, and PM2.5-10) were collected in a highway tunnel in Shanghai, China. The concentrations of nonpolar organic compounds (NPOCs), i.e., n-alkanes, polycyclic aromatic hydrocarbons (PAHs) and hopanes in the aerosol samples at the tunnel inlet and outlet, emission factors (EFs) of individual NPOCs in PM10, and EFs of size-fractionated individual NPOCs were analyzed comprehensively. NPOC concentrations in this tunnel were lower than the earlier tunnel results, which might be attributed to the tunnel configuration effect on the pollution dilution along the tunnel, in addition to the improvement of engine technol. and fuel quality during past decades. n-Alkane homologs for C14-C35 exhibited a smooth hump-like distribution pattern with the most abundance at C22 and 1-2 carbon number shifts of Cmax in comparison to those in other tunnels due to different fleet and fuel compositions The most abundant PAHs from diesel (e.g., Nap, Phe, Flu and Pyr) and gasoline (e.g., BghiF, BbkF, BeP, DBA and BghiP) vehicle emissions presented concentration increases of 1.8-5.8 times from the tunnel inlet to outlet. The individual n-alkane and PAH distributions exhibited obvious size dependence, while it was expected that the relative abundances and homolog distributions of hopanes were very similar for different size stages. Several diagnostic ratios, e.g., fossil/plant n-alkanes and LMW/HMW PAHs, were evidently size dependent, indicating different sources of size-fractionated n-alkanes and PAHs.

Environmental Pollution (Oxford, United Kingdom) published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Related Products of catalysis-chemistry.

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

Dai, Wei-Min published the artcileSynthesis of C3-C12 fragment of 24-demethylbafilomycin C₁ via anti-selective aldol condensation as the key stereocontrol step, SDS of cas: 4141-48-4, the publication is Synlett (2008), 1013-1016, database is CAplus.

An efficient synthesis of the C(3)-C(12) aldehyde fragment of 24-demethylbafilomycin C₁ was accomplished for assembling the 16-membered plecomacrolide skeleton according to a 1,3-diene-ene ring-closing metathesis (RCM) strategy. A boron-mediated anti-selective aldol condensation of Abiko’s chiral propionate was used to secure the C(6) and C(7) stereogenic centers while the C(8) chirality was introduced from a chiral building block. The dithiane alkylation and the Me ketone Horner-Wittig olefination using allyldiphenylphosphine oxide were employed for construction of the requisite (E)-1,3-diene subunit.

Synlett published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, SDS of cas: 4141-48-4.

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

Zhang, Yan published the artcileAu(III)-catalyzed intermolecular amidation of benzylic C-H bonds, Name: Bis(4-fluorophenyl)methane, the publication is Organic & Biomolecular Chemistry (2012), 10(46), 9137-9141, database is CAplus and MEDLINE.

Au(III)-catalyzed intermol. amidations of benzylic C-H bonds with sulfonamides and carboxamides are described. The protocol with the Au-bipy complex/N-bromosuccinimide system provides practical applications for synthesis of various amides via C-H activations. The reaction proceeds with high efficiency to give the corresponding amines, which are extremely useful synthetic intermediates.

Organic & Biomolecular Chemistry 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 C10H18O4, Name: Bis(4-fluorophenyl)methane.

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

Haerling, Stephan M. published the artcilePotassium Dimesitylphosphinite Catalyzed Intermolecular Hydrophosphorylation of Alkynes, Formula: C18H23OP, the publication is Organometallics (2018), 37(23), 4380-4386, database is CAplus.

The authors evaluated the scope of the intermol. hydrophosphorylation (Pudovik reaction) of alkynes R¹-Cú·C-R² (R¹ = H, alkyl, Ph; R² = alkyl, Ph, COOMe, SiMe₃, Si(iPr)₃) with bis(2,4,6-trimethylphenyl)phosphine oxide (dimesitylphosphine oxide, Mes₂P(O)H) in THF at room temperature or 65¡ã, catalyzed with 5 or 10 mol % of K dimesitylphosphinite (Mes₂P-O-K), yielding alkenyldimesitylphosphine oxides (Mes₂P(O)-C(R¹):C(H)R²). This procedure requires substituents with a -I effect at the Cú·C triple bond, whereas alkyl-substituted alkynes are inactive under these reaction conditions. The hydrophosphorylation proceeds regioselectively, but E/Z isomer mixtures were obtained. E/Z isomerization occurs at elevated temperatures with an estimated energy barrier of 59 kJ mol^-1 (R¹ = Me; R² = Ph). Trimethylsilyl substituents at the alkyne functionality (R¹ = H, Bu; R² = SiMe₃) destabilize the product, leading to degradation and formation of Mes₂P-O-SiMe₃ and R¹-Cú·C-H.

Organometallics published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, Formula: C18H23OP.

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

Aristov, B. G. published the artcileAdsorption of amines from aqueous solutions on copper phthalocyanine, Synthetic Route of 2016-56-0, the publication is Zhurnal Fizicheskoi Khimii (1979), 53(7), 1859-62, database is CAplus.

The adsorption of pentyl-, hexyl-, and octylamine and octylammonium and dodecylammonium acetates on ¦Â-phthalocyanine dyes was studied in aqueous solutions The adsorption capacity (a_m) and the surface area, occupied by adsorbed amine mols. on Cu phthalocyanine (I), were determined The large a_m value for pentylamine is explained by specific interaction (an addnl. to the dispersion) of pentylamine mols. on 010 lattice of I. The structure of the adsorbed layer is discussed. For I, the distance between the adsorption centers is ?7.2 ?.

Zhurnal Fizicheskoi Khimii published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Synthetic Route of 2016-56-0.

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

Dyer, Philip W. published the artcileRigid N-Phosphino Guanidine P,N Ligands and Their Use in Nickel-Catalyzed Ethylene Oligomerization, Name: Dimesitylphosphine oxide, the publication is Organometallics (2008), 27(19), 5082-5087, database is CAplus.

The rigid bidentate P,N-ligands I (3a–d, R substituent: a, Ph; b, mesityl; c, N-i-Pr₂; d, NPh₂), each with a 7-phosphino-1,5,7-triazabicyclo[4.4.0]dec-5-ene skeleton, are readily prepared in high yields and were used in the preparation of the Ni complexes [NiBr₂(3a–d)] (4a–d). The derivatives 4a,d are both diamagnetic, while their counterparts 4b,c are paramagnetic with values of ¦Ì_eff(300 K) of 2.05 and 2.10 ¦ÌB, resp. The structure of 4a was determined in the solid state by x-ray diffraction, which confirmed the ¦Ê²P,N coordination of 3a and the essentially square-planar geometry about Ni. In combination with EtAlCl₂ the Ni(II) complexes of 4b–d are active ethylene oligomerization initiators (C₂H₄, 1 bar; Ni:Al = 1:14; toluene), affording varying mixtures of butenes, hexenes, and octenes (trace), depending on the nature of the P-donor, but with a reasonable selectivity toward C₄ with complex 4c. In contrast, under identical reaction conditions complex 4a gives rise to products resulting from a sequence of ethylene oligomerization and subsequent Friedel-Crafts alkylation of the toluene solvent. Notably, no activity toward ethylene (1 bar) was observed for 4/MAO (Ni:Al = 1:15 or 1:500).

Organometallics published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, Name: Dimesitylphosphine oxide.

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

Leong, Sze Wei published the artcileSynthesis and SAR study of diarylpentanoid analogues as new anti-inflammatory agents, Application In Synthesis of 1772-76-5, the publication is Molecules (2014), 19(10), 16058-16081, 24 pp., database is CAplus and MEDLINE.

A series of ninety-seven diarylpentanoid derivatives I (R = H, 4-Cl, 4-Br, 5-OCH₃, 3,5-(OCH₃)₂, 4-OCH₃, 4,6-(Cl)₂; Ar = 3,4,5-trimethoxyphenyl, 2-chlorophenyl, 1-naphthyl, 2-furyl, 5-chloro-2-thienyl, etc.) were synthesized and evaluated for their anti-inflammatory activity through NO suppression assay using interferon gamma (IFN-¦Ã)/lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. Some of the compounds I exhibited greater or similar NO inhibitory activity in comparison with curcumin (14.7 ¡À 0.2 ¦ÌM), notably compounds I (R = 4-Cl; Ar = 2,3-(OH)₂-C₆H₃) and I (R = H; Ar = 2,3-(OH)₂-C₆H₃), which demonstrated the most significant NO suppression activity with IC₅₀ values of 4.9 ¡À 0.3 ¦ÌM and 9.6 ¡À 0.5 ¦ÌM, resp. A structure-activity relationship (SAR) study revealed that the presence of a hydroxyl group in both aromatic rings is critical for bioactivity of these mols. With the exception of the polyphenolic derivatives, low electron d. in ring-A and high electron d. in ring-B are important for enhancing NO inhibition. The pharmacophore mapping showed that hydroxyl substituents at both meta- and para-positions of ring-B could be the marker for highly active diarylpentanoid derivatives

Molecules published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, Application In Synthesis of 1772-76-5.

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

Leong, Sze Wei published the artcileSynthesis and SAR study of diarylpentanoid analogues as new anti-inflammatory agents, Recommanded Product: (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, the publication is Molecules (2014), 19(10), 16058-16081, 24 pp., database is CAplus and MEDLINE.

A series of ninety-seven diarylpentanoid derivatives I (R = H, 4-Cl, 4-Br, 5-OCH₃, 3,5-(OCH₃)₂, 4-OCH₃, 4,6-(Cl)₂; Ar = 3,4,5-trimethoxyphenyl, 2-chlorophenyl, 1-naphthyl, 2-furyl, 5-chloro-2-thienyl, etc.) were synthesized and evaluated for their anti-inflammatory activity through NO suppression assay using interferon gamma (IFN-¦Ã)/lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. Some of the compounds I exhibited greater or similar NO inhibitory activity in comparison with curcumin (14.7 ¡À 0.2 ¦ÌM), notably compounds I (R = 4-Cl; Ar = 2,3-(OH)₂-C₆H₃) and I (R = H; Ar = 2,3-(OH)₂-C₆H₃), which demonstrated the most significant NO suppression activity with IC₅₀ values of 4.9 ¡À 0.3 ¦ÌM and 9.6 ¡À 0.5 ¦ÌM, resp. A structure-activity relationship (SAR) study revealed that the presence of a hydroxyl group in both aromatic rings is critical for bioactivity of these mols. With the exception of the polyphenolic derivatives, low electron d. in ring-A and high electron d. in ring-B are important for enhancing NO inhibition. The pharmacophore mapping showed that hydroxyl substituents at both meta- and para-positions of ring-B could be the marker for highly active diarylpentanoid derivatives

Molecules 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, Recommanded Product: (E)-3-(2,4-Dimethoxyphenyl)acrylic acid.

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

Abu-Hashem, Ameen A. published the artcileSynthesis of 1,2,4-triazolopyridazines, isoxazolofuropyridazines, and tetrazolopyridazines as antimicrobial agents, COA of Formula: C10H10O3, the publication is Journal of Heterocyclic Chemistry (2020), 57(9), 3461-3474, database is CAplus.

Through current and previous researches, it was found that the derivatives of pyridazine, isoxazole, tetrazole, quinazoline, hydrazinyl, and 1,2,4-triazole had many pharmacol. activities. Thus, a series of novel furopyridazinones (7), isoxazolopyridazine (8), sub-benzylidene-furopyridazinones (9a-c), isoxazolofuropyridazines (10a-c), 3-chloro-(pyridin-4-ylmethylene)-dihydropyridazines (11), tetrazolopyridazines (12), pyridazinoquinazolinones (13), piperazinyl/morpholino-pyridazines (14a,b), hydrazinyl-pyridazines (15), and 1,2,4-triazolo-pyridazines (16a,b) in good yields (72%-90%) were synthesized from substituted Et 4-oxo-4-phenylbutanoate (2), 6-phenyl-4,5-dihydropyridazinone (3), and 6-phenyl-4-(pyridin-4-ylmethylene)-4,5-dihydropyridazinone (4) as beginning materials. All the chem. structures of the new compounds was demonstrated by different spectroscopy analyses such as IR, NMR, mass spectrum, and elemental anal. Also, the activities of the newly prepared compounds were tested against many types of bacteria and fungi in vitro. Hence, 1,2,4-triazolopyridazines (16a,b), isoxazolofuropyridazines (10a-c), tetrazolopyridazines (12), Piperazinyl/morpholinyl-pyridazines (14a,b) displayed the most efficient antimicrobial activities compared with the cefotaxime sodium and nystatin as standard drugs.

Journal of Heterocyclic Chemistry published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C10H10O3, COA of Formula: C10H10O3.

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

Niknam, K. published the artcileSynthesis of 2-substituted benzimidazoles and bis-benzimidazoles by microwave in the presence of alumina-methanesulfonic acid, SDS of cas: 5411-14-3, the publication is Journal of the Iranian Chemical Society (2007), 4(4), 438-443, database is CAplus.

A microwave-assisted method for the synthesis of 2-substituted benzimidazoles in the presence of alumina-methanesulfonic acid (AMA) is reported. In addition, by this method some new bis-benzimidazoles, e.g., I (X = O, S), from the direct reaction of 1,2-phenylenediamine and dicarboxylic acid under microwave irradiation in good to excellent yields are described.

Journal of the Iranian Chemical Society 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, SDS of cas: 5411-14-3.

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