Catalysis-chemistry

Pant, Kirty published the artcileAssessment of fatty acids, amino acids, minerals, and thermal properties of bee propolis from Northern India using a multivariate approach, Synthetic Route of 6217-54-5, the publication is Journal of Food Composition and Analysis (2022), 104624, database is CAplus.

First-ever, the propolis samples collected from different geog. locations of Northern India were investigated based on nutritional composition and thermal anal. Gas chromatograph flame ionization detector (GC-FID) identified the presence of essential fatty acids: linoleic acid, ¦Á-linolenic acid, cis-11,14,17-eicosatrienoic acid, eicosapentaenoic acid, docosahexaenoic acid, ¦Ã-linolenic acid, dihomo-¦Ã-linolenic acid, and cis-11-14-eicosadienoic acid in the samples. Addnl., first-time detection of 17 amino acids showed the presences of tyrosine, glutamic acid, threonine, arginine, lysine and aspartic acid as predominant in the samples, whereas microwave plasma-at. emission spectroscopy (MP-AES) revealed abundance of calcium (5706.2-3121.0 mg/kg) followed by potassium (2636.0-1615.5 mg/kg), iron (2487.0-1161.2 mg/kg) and magnesium (1573.4-841.0 mg/kg). Furthermore, differential scanning calorimetry (DSC) showed major endothermic peaks at approx. 60 C demonstrating melting of long and medium chain fatty acids especially beeswax and palmitic acid, while the secondary peaks exposed vaporization of aromatic compounds Thermogravimetric analyzer (TGA) depicted major weight loss of propolis between 270 and 470 ¡ãC and obtained 14.99-40.02% residual weight Principal Component anal. demonstrated 99.18% variation in the first three principal components. Hierarchical cluster anal. categorized all the propolis samples successfully based on geog. locations. This study may assist quality control authorities to establish nutritional and quality standards of Indian propolis in future.

Journal of Food Composition and Analysis 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, Synthetic Route of 6217-54-5.

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

Sharma, Deepika published the artcilePd-Au Supported Reduced Graphene Oxide Catalyst for Carbon- Hydrogen Bond Activation in Benzene, Safety of 4,4′-Dimethyldiphenyl, the publication is ChemistrySelect (2021), 6(28), 7111-7117, database is CAplus.

An improved reduced graphene oxide supported bimetallic palladium and gold catalyst was synthesized for the carbon-hydrogen bond activation of un-activated aromatic organic substrate benzene. XPS anal. has revealed that catalyst contained Au(0) nanoparticles with Pd(II) ions on its surface. The surface of rGO was found to be rich in sp² carbon content with >C=O groups that most probably provided supporting sites for the gold and palladium metals. The XRD anal. further confirmed that Au(0) nanoparticles with palladium oxide and palladium nanoparticles were present on rGO surface. The catalytic activity of the material was tested towards activation of benzene to form biphenyl as an end product. D. function theory has revealed that Pd(II) ion was the active component that insert itself in between C-H bond of benzene and showed efficiency to interact with oxygen mols. Simultaneously, Au(0) atoms have the tendency to adsorb on the ¦Ð-bonded surface of the catalyst and extend its conjugation that reduced the HOMO-LUMO gap of the catalyst and provided the good catalytic activity.

ChemistrySelect published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C6H12Br2, Safety of 4,4′-Dimethyldiphenyl.

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

Halle, Jean C. published the artcileIonization of substituted nitroaromatic amines in aqueous dimethyl sulfoxide media. I. Poly(nitro)arylamines, Synthetic Route of 1821-27-8, the publication is Bulletin de la Societe Chimique de France (1973), 1225-30, database is CAplus.

The acidity constants (pKa) of 22 mono-, di-, and trinitroarylamines were determined in H2O-Me2SO. The pKa’s of mononitro amines decreased with increasing Me2SO content of the medium, but the pKa’s of dinitro and trinitro amines increased with increased Me2SO in the medium. These results indicate that the stabilizing influence of Me2SO on amide anions is greater as the charge is more delocalized.

Bulletin de la Societe Chimique de France 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

Pudovik, M. A. published the artcile2-(2-Hydroxyphenyl)imidazolidines and their O-phosphorylated derivatives, Name: N1,N2-Dibenzylethane-1,2-diamine, the publication is Russian Journal of General Chemistry (2017), 87(1), 60-65, database is CAplus.

2-(2-Hydroxyaryl)imidazolidines were synthesized by reaction of aromatic carbonyl compounds with N,N’-dialkylethylenediamines. The title compounds were also prepared using the corresponding Schiff bases instead of carbonyl compounds Phosphorylation of 2-(2-hydroxyphenyl)imidazolidines with phosphoryl and phosphorothioyl chlorides and phosphorochloridites was accomplished. The reaction of O-phosphorylsalicylaldehyde with N,N’-dialkylethylenediamines also afforded 2-(2-hydroxyphenyl)imidazolidines.

Russian Journal of General Chemistry published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Name: N1,N2-Dibenzylethane-1,2-diamine.

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

Aminov, S. N. published the artcileTelomerization of ethylene by aliphatic acids and their derivatives, Related Products of catalysis-chemistry, the publication is Uzbekskii Khimicheskii Zhurnal (1965), 9(5), 36-42, database is CAplus.

The acid products of the (Me₃CO)₂-initiated telomerization of C₂H₄ with HOAc at 140¡ã consisted of 7.5% CH₃(CH₂)₂CO₂H (I), 6% CH₃(CH₂)₄CO₂H (II), 22.5% CH₃(CH₂)₃CHEtCO₂H (III), traces of CH₃(CH₂)₆CO₂H (IV), 7% CH₃(CH₂)₃CHBuCO₂H (V), traces of CH₃(CH)₈CO₂H (VI), and 57% of higher acids when the C₂H₄ pressure was 15 atm. and the HOAc-(Me₃CO)₂ molar ratio was 5:0.055. In the same reaction at an C₂H₄ pressure of 40 atm., the product composition was 3% I, 5% II, 6% III, 2% IV, 4% V, 6% VI, and 74% of higher acids. When the reaction was initiated with the same molar amount of (C₆H₁₁OCO₂)₂ at 60¡ã and an C₂H₄ pressure of 7.5 atm., the product composition was 9.5% II, 4% III, 7.5% IV, 3% V, 14% VI, and 62% of higher acids. The acid products of the telomerization of C₂H₄ with 2.5 moles I in the presence of 10 ml. (Me₃CO)₂ at an C₂H₄ pressure of 20 atm. consisted of 31% Et₂CHCO₂H, 11% III, 3% CH₃(CH₂)₃CEt₂CO₂H, and 55% of higher acids. In an analogous reaction of C₂H₄ with II, the product consisted of 37% III, 11% V, and 52% of higher acids. The products of the (Me₃CO)₂-initiated telomerization of C₂H₄ with MeCN at 138-43¡ã and C₂H₄ pressures of 20 and 40 atm. consisted of 0.5 and 0.7% PrCN, 3.2 and 5.6% CH₃(CH₂)₄CN, 4 and 2% CH₃(CH₂)₃CHEtCN, 3 and 3% CH₃(CH₂)₆CN, 1 and 1% CH₃(CH₂)₃CHBuCN, 0.2 and 2% CH₃(CH₂)₈CN, and 75 and 77% of higher nitriles, resp. The yields of higher nitriles were 80 and 85% at C₂H₄ pressures of 60 and 80 atm. The product of the telomerization of C₂H₄ with CH₂(CO₂Et)₂ at 140¡ã and C₂H₄ pressures of 40 and 80 atm. consisted of 8 and 1.5% EtCH(CO₂Et)₂, 3 and 0.5% Et₂C(CO₂Et)₂, 7 and 1% BuCH(CO₂Et)₂, 14.5 and 6.5% EtBuC(CO₂Et)₂, 8 and 2.5% Bu₂C(CO₂Et)₂, and 51.5 and 87.5% of higher telomers, resp., when the (Me₃CO)₂-CH₂(CO₂Et)₂ molar ratio was 0.027:1. Telomers were also prepared at other (Me₃CO)₂ concentrations and with the use of (C₆H₁₁OCO₂)₂ at 60¡ã and Bz₂O₂ at 80¡ã as initiators. The products of iso structure were assumed to be formed by a mechanism involving a 1,5 hydrogen shift in an intermediate radical and decreased in yield as the reaction temperature was lowered.

Uzbekskii Khimicheskii Zhurnal 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, Related Products of catalysis-chemistry.

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

Wu, Xun published the artcileSize-Controlled Nanoparticles Embedded in a Mesoporous Architecture Leading to Efficient and Selective Hydrogenolysis of Polyolefins, Name: 3-(Trimethoxysilyl)propan-1-amine, the publication is Journal of the American Chemical Society (2022), 144(12), 5323-5334, database is CAplus and MEDLINE.

A catalytic architecture, comprising a mesoporous silica shell surrounding platinum nanoparticles (NPs) supported on a solid silica sphere (mSiO₂/Pt-X/SiO₂; X is the mean NP diameter), catalyzes hydrogenolysis of melt-phase polyethylene (PE) into a narrow C₂₃-centered distribution of hydrocarbons in high yield using very low Pt loadings (?10^-5 g Pt/g PE). During catalysis, a polymer chain enters a pore and contacts a Pt NP where the C-C bond cleavage occurs and then the smaller fragment exits the pore. mSiO₂/Pt/SiO₂ resists sintering or leaching of Pt and provides high yields of liquids; however, many structural and chem. effects on catalysis are not yet resolved. Here, we report the effects of Pt NP size on activity and selectivity in PE hydrogenolysis. Time-dependent conversion and yields and a lumped kinetics model based on the competitive adsorption of long vs. short chains reveal that the activity of catalytic material is highest with the smallest NPs, consistent with a structure-sensitive reaction. Remarkably, the three mSiO₂/Pt-X/SiO₂ catalysts give equivalent selectivity. We propose that mesoscale pores in the catalytic architecture template the C₂₃-centered distribution, whereas the active Pt sites influence the carbon-carbon bond cleavage rate. This conclusion provides a framework for catalyst design by separating the C-C bond cleavage activity at catalytic sites from selectivity for chain lengths of the products influenced by the structure of the catalytic architecture. The increased activity, selectivity, efficiency, and lifetime obtained using this architecture highlight the benefits of localized and confined environments for isolated catalytic particles under condensed-phase reaction conditions.

Journal of the American Chemical Society 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 C7H13NO2, Name: 3-(Trimethoxysilyl)propan-1-amine.

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

Huang, Tzou-Chi published the artcileDiallyl disulphide, but not diallyl sulphide, increases leucocyte function-associated antigen-1 expression and cellular adhesion in monocytes, Quality Control of 6972-05-0, the publication is Food Chemistry (2010), 120(1), 113-120, database is CAplus.

A steam distillation process at pH 9 was conducted to prepare garlic oil for food supplement. A garlic oil predominant in bioactive diallyl monosulfide (8.9%), diallyl disulfide (56.9%) diallyl trisulfide (7.6%) and diallyl tetrasulfide (2.6%) was obtained from peeled garlic cloves. The adhesion mol. leukocyte function-associated antigen-1 (LFA-1) mediates leukocyte adhesion and migration during immune responses. In this study, we investigated the effects of diallyl sulfide (DAS) and diallyl disulfide (DADS) on LFA-1 expression, cell adhesion and migration in the U937 and peritoneal macrophages from mice. After treatment, DADS, but not DAS, elevated the expression of LFA-1 in a dose- and time-dependent manner in U937 cells and peritoneal macrophages. Moreover, LFA-1 and intracellular adhesion mol.-1 (ICAM-1)-mediated adhesion also was increased by DADS in a dose- and time-dependent manner. After DADS treatment, LFA-1 clustering also increased on U937 surface. In contrast, there was no significant difference in migration of U937 cells between DADS treatment and no treatment. This study indicates the DADS, but not DAS, regulates immune responses by modulating LFA-1 expression, clustering and LFA-1-mediated adhesion in monocytes, evidences that DADS acts as an immune regulator of adhesion mols. during immune responses.

Food Chemistry 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 C3H8N2S, Quality Control of 6972-05-0.

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

Giese, Claudia-Corina published the artcileExperimental and Theoretical Constraints on Amino Acid Formation from PAHs in Asteroidal Settings, Safety of Coronene, the publication is ACS Earth and Space Chemistry (2022), 6(3), 468-481, database is CAplus and MEDLINE.

Amino acids and polycyclic aromatic hydrocarbons (PAHs) belong to the range of organic compounds detected in meteorites. In this study, we tested empirically and theor. if PAHs are precursors for amino acids in carbonaceous chondrites, as previously suggested. We conducted experiments to synthesize amino acids from fluoranthene (PAH), with ammonium bicarbonate as a source for ammonia and carbon dioxide under mimicked asteroidal conditions. In our thermodn. calculations, we extended our anal. to addnl. PAH-amino acid combinations. We explored 36 reactions involving the PAHs naphthalene, anthracene, fluoranthene, pyrene, triphenylene, and coronene and the amino acids glycine, alanine, valine, leucine, phenylalanine, and tyrosine. Our experiments do not show the formation of amino acids, whereas our theor. results hint that PAHs could be precursors of amino acids in carbonaceous chondrites at low temperatures

ACS Earth and Space Chemistry 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, Safety of Coronene.

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

Kondo, Naoya published the artcileDevelopment of PEGylated peptide probes conjugated with ¹⁸F-labeled BODIPY for PET/optical imaging of MT1-MMP activity, Formula: C17H37NO3, the publication is Journal of Controlled Release (2015), 220(Part_A), 476-483, database is CAplus and MEDLINE.

Since the processing activity of the matrix metalloproteinase MT1-MMP regulates various cellular functions such as motility, invasion, growth, differentiation and apoptosis, precise in vivo evaluation of MT1-MMP activity in cancers can provide beneficial information for both basic and clin. studies. For this purpose, we designed a cleavable Positron Emission Tomog. (PET)/optical imaging probe consisting of BODIPY650/665 and polyethylene glycol (PEG) conjugated to opposite ends of MT1-MMP substrate peptides. We used in vitro and in vivo fluorescence experiments to select suitable substrate peptide sequences and PEG sizes for the MT1-MMP probes and obtained an optimized structure referred to here as MBP-2k. Radiofluorinated MBP-2k ([¹⁸F]MBP-2k) was then successfully synthesized via an ¹⁸F-¹⁹F isotopic exchange reaction in BODIPY650/665. After i.v. injection into mice with xenografted tumors, [¹⁸F]MBP-2k showed significantly higher accumulation in HT1080 tumors with high MT1-MMP activity than in A549 tumors that have low MT1-MMP activity. Moreover, PET images showed better contrast in HT1080 tumors. These results show that [¹⁸F]MBP-2k can be used as a hybrid PET/optical imaging agent and is a promising probe for non-invasive monitoring of MT1-MMP activity in cancers. This probe may also efficiently combine targeted tumor imaging with image-guided surgery that could be beneficial for patients in the future.

Journal of Controlled Release published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C17H37NO3, Formula: C17H37NO3.

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

Borowiecki, Pawel published the artcileBiocatalytic Asymmetric Reduction of ¦Ã-Keto Esters to Access Optically Active ¦Ã-Aryl-¦Ã-butyrolactones, Application of 3-Benzoylpropionicacid, the publication is Advanced Synthesis & Catalysis (2020), 362(10), 2012-2029, database is CAplus.

An efficient stereoselective syntheses of a series of functionalized optically active ¦Ã-aryl-¦Ã-butyrolactones is achieved by enzymic asym. reduction of the corresponding sterically demanding ¦Ã-keto esters employing wild-type and recombinant alc. dehydrogenases. The best stereoselectivities for the reduction via hydrogen transfer was obtained with two short chain dehydrogenases (SDRs) of complementary stereospecificity from Aromatoleum aromaticum, namely the Prelog-specific NADH-dependent (S)-1-phenylethanol dehydrogenase [(S)-PED] and the anti-Prelog-specific (R)-1-(4-hydroxyphenyl)-ethanol dehydrogenase [(R)-HPED], resp. Biotransformations catalyzed by both enzymes, followed by TFA-catalyzed cyclization of the resulting ¦Ã-hydroxy esters, furnished the resp. (S)- and (R)-configured products with exquisite optical purity (up to >99% ee). The synthetic value was demonstrated on preparative scale for the asym. bioreduction of the model compound, Me 4-oxo-4-phenylbutanoate, affording optically pure (S)-¦Ã-phenyl-¦Ã-butyrolactone (>99% ee) in 67-74% isolated yield at 89-95% conversion depending on the applied scale.

Advanced Synthesis & Catalysis 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, Application of 3-Benzoylpropionicacid.

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