Catalysis-chemistry

Ihantola, Tuukka published the artcileGenotoxic and inflammatory effects of spruce and brown coal briquettes combustion aerosols on lung cells at the air-liquid interface, Safety of Coronene, the publication is Science of the Total Environment (2022), 806(Part_1), 150489, database is CAplus and MEDLINE.

Solid fuel usage in residential heating and cooking is one of the largest sources of ambient and indoor air particulate matter, which causes adverse effects on the health of millions of peoples worldwide. Emissions from solid fuel combustion, such as biomass or coal, are detrimental to health, but toxicol. responses are largely unknown. In the present study, we compared the toxicol. responses regarding cytotoxicity, inflammation and genotoxicity of spruce (SPR) and brown coal briquette (BCB) combustion aerosols on human alveolar epithelial cells (A549) as well as a coculture of A549 and differentiated human monocytic cells (THP-1) into macrophages exposed at the air-liquid interface (ALI). We included both the high emissions from the first hour and moderate emissions from the third hour of the batch combustion experiment in one ALI system, whereas, in the second ALI system, we exposed the cells during the whole 4-h combustion experiment, including all combustion phases. Physico-chem. properties of the combustion aerosol were analyzed both online and offline. Both SPR and BCB combustion aerosols caused mild cytotoxic but notable genotoxic effects in co-cultured A549 cells after one-hour exposure. Inflammatory response anal. revealed BCB combustion aerosols to cause a mild increase in CXCL1 and CXCL8 levels, but in the case of SPR combustion aerosol, a decrease compared to control was observed

Science of the Total Environment 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

Hamacher, K. published the artcileElectrochemical cell for separation of [¹⁸F]fluoride from irradiated ¹⁸O-water and subsequent no carrier added nucleophilic fluorination, Category: catalysis-chemistry, the publication is Applied Radiation and Isotopes (2002), 56(3), 519-523, database is CAplus and MEDLINE.

An electrochem. cell was designed allowing the anodic deposition of n.c.a. [¹⁸F]fluoride solubilized in an ¹⁸O-water target and subsequent n.c.a. nucleophilic ¹⁸F-fluorination. The recovery of the deposited [¹⁸F]fluoride can be achieved in the presence of an aprotic solvent containing a phase-transfer catalyst (PTC). The radioisotope adsorbed electrochem. at the cylindrical surface of a glassy carbon electrode can be dried easily by washing the cell twice with dry aprotic solvents while maintaining a low elec. field. This simple washing step makes an azeotropic drying process obsolete. Accordingly, less basic cryptates like [K?2.2.2.]oxalate or triflate can be used for nucleophilic ¹⁸F-fluorination because loss of activity as a consequence of azeotropic drying under conditions of low basicity does not occur. The usefulness of this technique is exemplified for the n.c.a. synthesis of various ¹⁸F-labeled compounds The radiotracers were synthesized with higher radiochem. yields and under much easier conditions than the conventional ¹⁸F-fluorination procedure which includes an addnl. drying step of the PTC.

Applied Radiation and Isotopes 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, Category: catalysis-chemistry.

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

Saito, Kaori published the artcileCalix[4]arenes bearing four redox-active ¦Ð-conjugated pendant groups for a dimensionally oriented redox system, Quality Control of 1798-04-5, the publication is Bulletin of the Chemical Society of Japan (2002), 75(8), 1845-1846, database is CAplus.

A p-tert-butylcalix[4]arene I [R = CH₂CONH(p-C₆H₄NH)₃Ac], bearing four redox-active phenylenediamine pendant groups on the lower rim, was synthesized and characterized spectroscopically and electrochem. The interconversion of the oxidation states of the pendant groups was demonstrated both chem. and electrochem.

Bulletin of the Chemical Society of Japan published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Quality Control of 1798-04-5.

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

Takahashi, Eiki published the artcileDiscovery of potent transient receptor potential vanilloid 1 antagonists: Design and synthesis of phenoxyacetamide derivatives, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Bioorganic & Medicinal Chemistry Letters (2013), 23(11), 3154-3156, database is CAplus and MEDLINE.

We aimed to discover a novel type of transient receptor potential vanilloid 1 (TRPV1) antagonist because such antagonists are possible drug candidates for treating various disorders. We modified the structure of hit compound I (human TRPV1 IC₅₀ = 411 nM) and converted its pyrrolidino group to a (hydroxyethyl)methylamino group, which substantially improved inhibitory activity (II; human TRPV1 IC₅₀ = 33 nM). In addition, II ameliorated bladder overactivity in rats in vivo.

Bioorganic & Medicinal Chemistry Letters published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C14H31NO2, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid.

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

Takahashi, Eiki published the artcileDiscovery of potent transient receptor potential vanilloid 1 antagonists: Design and synthesis of phenoxyacetamide derivatives, Application of 2-(4-(Trifluoromethyl)phenoxy)acetic acid, the publication is Bioorganic & Medicinal Chemistry Letters (2013), 23(11), 3154-3156, database is CAplus and MEDLINE.

We aimed to discover a novel type of transient receptor potential vanilloid 1 (TRPV1) antagonist because such antagonists are possible drug candidates for treating various disorders. We modified the structure of hit compound I (human TRPV1 IC₅₀ = 411 nM) and converted its pyrrolidino group to a (hydroxyethyl)methylamino group, which substantially improved inhibitory activity (II; human TRPV1 IC₅₀ = 33 nM). In addition, II ameliorated bladder overactivity in rats in vivo.

Bioorganic & Medicinal Chemistry Letters published new progress about 163839-73-4. 163839-73-4 belongs to catalysis-chemistry, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Ether, name is 2-(4-(Trifluoromethyl)phenoxy)acetic acid, and the molecular formula is C8H6ClNO3S2, Application of 2-(4-(Trifluoromethyl)phenoxy)acetic acid.

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

Bock, Harald published the artcileStructure of bis(pentafluorophenyl)xenon, Xe(C₆F₅)₂, Synthetic Route of 1206-46-8, the publication is Angewandte Chemie, International Edition (2002), 41(3), 448-450, database is CAplus and MEDLINE.

Reaction of Me₃SiC₆F₅ with XeF₂ in CH₂Cl₂ gave Xe(C₆F₅)₂ (1). The x-ray crystal structure of 1 was determined The exptl. results are supported by MP2 and DFT (B3LYP) calculations

Angewandte Chemie, International Edition 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, Synthetic Route of 1206-46-8.

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

Monte, Manuel J. S. published the artcileVapor pressures, enthalpies and entropies of sublimation of trans-cinnamic acid and of nine methoxy and dimethoxycinnamic acids, HPLC of Formula: 16909-09-4, the publication is Journal of Chemical Thermodynamics (1999), 31(11), 1443-1456, database is CAplus.

The Knudsen mass-loss effusion technique was used to measure the vapor pressure as a function of temperature for trans-cinnamic acid and nine substituted methoxy and dimethoxy cinnamic acids. From the temperature dependence of the vapor pressure, the standard molar enthalpies and entropies of sublimation at 298.15 K were calculated for all the studied compounds using the estimated value ¦¤_cr^gc_p,m^o = -50 J¡¤K^-1¡¤mol^-1. The results obtained for trans-cinnamic acid and for the trans-methoxy and trans-dimethoxy cinnamic acids together with literature results for benzoic acid and substituted methoxy and dimethoxy benzoic acids allowed us to derive the correlation: ¦¤_cr^gH_m^o{T(p = 0.5 Pa)}/(kJ¡¤mol^-1) = (0.623 ¡À 0.026)¡¤{T(p = 0.5 Pa)/K} + (-106.3 ¡À 9.4) where T(p = 0.5 Pa) is the temperature at which the equilibrium vapor pressure of each crystalline compound is 0.5 Pa. (c) 1999 Academic Press.

Journal of Chemical Thermodynamics 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, HPLC of Formula: 16909-09-4.

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

Nakamoto, Masami published the artcilePreparation and crystal structures of gold(I) complexes of a series of benzenethiolates: pair formation by gold-to-gold interactions of (benzenethiolato)(triphenylphosphine)gold(I), Application In Synthesis of 22693-41-0, the publication is Chemische Berichte (1993), 126(3), 605-10, database is CAplus.

Ph₃PAuCl reacts readily with PhSH and sterically hindered 2,4,6-R₃C₆H₂SH in the presence of NEt₃ to yield stable Ph₃PAu(SC₆H₂R₃-2,4,6) (1–4; R = H, Me, Et, CHMe₂, resp.). The crystal structures of these complexes were determined by single-crystal x-ray diffraction anal. In all compounds the Au atoms are linearly 2-coordinate with very similar bond lengths and angles. While 2–4 with bulky thiolate ligands are monomeric in the crystal lattice, 1 forms pairs of mols. with intermol. Au-Au contacts of 313.5(5) pm. The Moessbauer spectra of the complexes exhibit large isomer shifts (I.S.), of 3.06¡ú3.72 mm s^-1, and quadrupole splittings (Q.S.), of 7.90¡ú8.68 mm s^-1. These data can be attributed to the strong electron-donating properties of the benzenethiolate ligands. The Au-Au contacts in 1 lead to I.S. and Q.S. values which are slightly smaller than those of 2–4. The Au-S distances do not show a major influence of the S-Au-P pairing in 1 as compared to 2–4.

Chemische Berichte 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, Application In Synthesis of 22693-41-0.

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

Schildknecht, Hermann published the artcileStructure and effects of mustelid ecomones. IV. Analysis of behaviorally active glandular secretions of the badger (Meles meles L.), Name: 2-Butylhexanoic acid, the publication is Chemiker-Zeitung (1984), 108(1), 1-5, database is CAplus.

In the subcaudal gland secretion of male or female badger, which has a function in that it is used to mark territory and prey, as well as other roles in chem. communication, the following fatty acids were identified: propionate??[79-09-4], isobutyrate??[79-31-2], butyrate??[107-92-6], 2-methylbutyrate??[116-53-0], isovalerate??[503-74-2], valerate??[109-52-4], isocaproate??[646-07-1], capryllate??[124-07-2], and methylnonanoate??[1731-84-6]. These fatty acids were in the foul-odor fraction of the secretion, and the odor of the anal gland secretion was also caused by lower fatty acids. However, lipophilic substances, especially higher saturated and unsaturated fatty acids, were also present in both subcaudal and anal gland secretions. The following ketones were also identified in anal gland secretions: 3-butylnonan-2-one??[58766-10-2], 3-butylundecan-2-one??[89355-10-2], 3-butyltridecan-2-one??[89355-11-3], and 3-butylpentadecan-2-one??[89355-12-4].

Chemiker-Zeitung 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, Name: 2-Butylhexanoic acid.

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

Hill, Carl M. published the artcileThe synthesis, properties, and catalytic hydrogenation of several aryloxy substituted ketene monomers and dimers, Product Details of C12H16O3, the publication is Journal of the American Chemical Society (1953), 1084-6, database is CAplus.

p-Me₃CC₆H₄ONa treated with EtCHBrCO₂Et in MeOH gave p-Me₃CC₆H₄OCHEtCO₂Et which was hydrolyzed to the corresponding acid (I), 63%, m. 87-8.5¡ã (from petr. ether-C₆H₆) (all m.ps. reported are corrected). Similarly were obtained: p-Me₃CC₆H₄CHBuCO₂H, 69%, m. 89-90¡ã, and p-Me₃CC₆H₄CHAmCO₂H, 63%, m. 72-3¡ã. The ¦Á-aryloxy acids were converted with SOCl₂ to the corresponding acyl chlorides, p-Me₃CC₆H₄OCHRCOCl (II) (R, b.p./mm., % yield, n²⁰_D, and d₂₀ given): H (III), 130-2¡ã/5, 90, 1.5162, 1.1128, from p-tert-BuC₆H₄OCH₂CO₂H, m. 88-9¡ã; Me (IV), 143-5¡ã/26, 60, 1.5092, 1.0775, from p-Me₃CC₆H₄OCHMeCO₂H, m. 86-7¡ã; Et, 131-2¡ã/3, 94, 1.5055, 1.0651; Bu, 143-4¡ã/3, 95, 1.5018, 1.0641; and Am, 149-50¡ã/6, 97, 1.5003, 0.9984. To 0.5 g. II in 100 cc. dry Et₂O was added dry NH₃ and the crude precipitate filtered off and recrystallized from MeOH to give the amides p-Me₃CC₆H₄OCHRCONH₂ (R, m.p., and % yield given): H, 131-2¡ã, 86; Me, 116-17¡ã, 91; Et, 97-9¡ã, 87; Bu, 145-6¡ã, 71; and Am, 86-7¡ã, 76. III in 20 cc. dry C₆H₆ warmed with an equivalent amount PhNH₂ on the water bath gave p-Me₃CC₆H₄OCH₂CONHPh, m. 91-2¡ã. Similarly was prepared p-Me₃CC₆H₄OCHMeCONHPh, m. 83-4¡ã. The dehydrochlorination of III as previously described (cf. C.A. 45, 10128i) gave 37% p-tert-butylphenoxyketene dimer (V), m. 85-6¡ã, b₅ 180-3¡ã. IV gave similarly 55% p-tert-butylphenoxymethylketene dimer (VI), m. 78-9¡ã, b₆ 147-50¡ã. By the same procedure were prepared the following p-tert-butylphenoxyalkylketene monomers (alkyl, b.p./mm., % yield, n²⁰_D, and d₂₀ given): Et (VII), 175-6¡ã/12, 66, 1.5178, 1.0132; Bu (VIII), 169-71¡ã/10, 54, 1.5044, 1.0157; and Am (IX), 132-3¡ã/5, 73, 1.5056, 0.9771. Weighed samples of the ketenes (5-15 g.) in 25 cc. petr. ether were hydrogenated 4-6 hrs. over 2-4 g. Raney Ni at 1500-3500 lb./sq. in. pressure, the mixture filtered, the solvent distilled off, the residue distilled, and the glycol fraction washed with small portions 15% aqueous Na₂CO₃ and H₂O, dried with MgSO₄, and redistilled, giving 2 fractions, p-Me₃CC₆H₄OH, m. 94-5¡ã (from petr. ether-C₆H₆), and glycols corresponding to the ketene dimer. In the case of V, the p-Me₃C₆H₄ was not split off and the only product was 2,4-bis(p-tert-butylphenoxy)-1,3-butanediol dimer, m. 88-9¡ã ; bis(3,5-dinitrobenzoate), m. 140-1¡ã. VI gave by hydrogenation 50% CHMe.CH(OH).CHMe.CHOH, b₂₀ 83-4¡ã n²⁰_D 1.5328, d₂₀ 1.0570; bis(3,5-dinitrobenzoate), 40%, m. 126-7¡ã. The other ketenes were converted similarly to the corresponding CHR.CH(OH).CHR.CHOH (X) [R, % yield, b.p./mm., n²⁰_D, d₂₀, and, in parentheses, the % yield and m.p. of the bis(3,5-dinitrobenzoate), given]: Et, 65, 75-7¡ã/10, 1.4458, 0.9165 (37, 165-6¡ã); Bu, 40, 125-6¡ã/3, 1.4343, 0.9108 (35, 162-3¡ã); and Am, 35, 125-7¡ã/5, 1.4388, 0.8957 (50, 163-4¡ã). The 2 isomeric forms of the previously prepared (2,4-Cl₂C₆H₃OCR:C:O)₂ (XI), where R is Et, Pr, and Bu, gave by the same procedure the following pairs of isomeric X [R, % yield, b.p./mm., n²⁰_D (except where otherwise stated), d₂₀ values and in parentheses, the % yield and m.p. of the bis(p-nitrobenzoate) given]: Et, 55, 60-3¡ã/3, n²¹_D 1.5228, 1.0018 (48, 118-19¡ã), and 40% 2,4-Cl₂C₆H₃OH (XII), m. 42-3¡ã (3,5-dinitrobenzoate, m. 142-3¡ã), from liquid XI with R = Et; Et, 20, 59-61¡ã/3, 1.5362, 1.0784, MR_D 41.64 (54, 85-6¡ã), and 35% XII from solid XI with R = Et; Pr, 20, m. 21-3¡ã, 63-5¡ã/3, n²⁵_D 1.5362, 1.0757 (56, 88-90¡ã), and 65% XII from liquid XI with R = Pr; Pr, 67, 102-4¡ã/3, 1.5261, 1.0612, MR_D 49.76 (68, 114-15¡ã), and 28% XII from solid XI with R = Pr; Bu, 27, 62¡ã/4, 1.5183, 1.0688, MR_D) 56.73 (45, 115-16¡ã), and 45% XII from liquid XI with R = Bu; and Bu, 56, 65-8¡ã/2, 1.5299, 1.0378, MR_D 59.53 (61, 119-20¡ã), and 38% XII from solid XI with R = Bu.

Journal of the American Chemical Society published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Product Details of C12H16O3.

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