Catalysis-chemistry

Patel, Nimesh R. published the artcileTrifluoromethylation and pentafluorophenylation of sulfur and carbon centers using (trifluoromethyl)- and (pentafluorophenyl)trimethylsilane, SDS of cas: 1206-46-8, the publication is Inorganic Chemistry (1992), 31(12), 2537-40, database is CAplus.

Trifluoromethyl and pentafluoromethyl moieties are easily transferred to a variety of fluorinated inorganic and organic sulfur and carbon centers by using (trifluoromethyl)trimethylsilane and (pentafluorophenyl)trimethylsilane in the presence of catalytic amounts of fluoride ion. This method is readily applied to the simple, efficient preparation of known, previously difficult to obtain mols., as well as a number of new perfluoroalkyl and perfluoroaryl sulfuranes, sulfoxides, ketones, esters, and alcs. In addition, the first stable oxysulfurane containing more than two sulfur-carbon bonds, Me₂CF₃SOSiMe₃, has been prepared

Inorganic Chemistry 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, SDS of cas: 1206-46-8.

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

Patel, Nimesh R. published the artcileSilylated compounds as transfer reagents with active carbon-chlorine, carbon-fluorine or sulfur-fluorine bonds, Computed Properties of 1206-46-8, the publication is Inorganic Chemistry (1993), 32(22), 4802-6, database is CAplus.

Photolytic insertion of R_fCú·N or ClCú·N into the nitrogen-chlorine bond of (CF₃)₂NCl occurs readily to form (CF₃)₂NN:C(R_f)Cl [R_f = CF₃ (2), C₂F₅ (3)] or (CF₃)₂NN:CCl₂. Reactions of CF₃N(C₂F₅)N:C(CF₃)Cl, 2, or 3 with C₆F₅SiMe₃ in the presence of CsF at 25¡ã result in CF₃(R_f)NN:C(R_f‘)C₆F₅ (R_f, R_f‘ = CF₃, C₂F₅). Analogously, the silylated reagents C₆F₅SiMe₃, Me₂NSiMe₃, and CF₃SiMe₃ easily displace chlorine as Me₃SiCl from SF₅N:C(C₂F₅)Cl to form SF₅N:C(C₂F₅)X (X = C₆F₅, NMe₂, CF₃). The pentafluorophenyl moiety is also readily introduced into (CF₃)₂NCF₂N:C(F)OC(CF₃)₂CH₃ and (CF₃)₂NN:C(Cl)F by metathesis with C₆F₅SiMe₃ to give (CF₃)₂NCF₂N:C(C₆F₅)OC(CF₃)₂CH₃ and (CF₃)₂NN:C(C₆F₅)N(CF₃)₂, resp. Under similar mild conditions, CF₃N:SF₂ forms CF₃N:S(R_f)₂ [R_f = CF₃ (17), C₆F₅] with CF₃SiMe₃ and C₆F₅SiMe₃. With ClF, 17 is oxidatively fluorinated to cis and trans-(CF₃)₂SF₄. The nitriles (CF₃)₂NCN and C₂F₅CN readily insert into the sulfur-chlorine bond of CF₃SCl to give (CF₃)₂NC(Cl):NSCF₃ and C₂F₅C(Cl):NSF₃. With SF₅Cl, (CF₃)₂NCN forms (CF₃)₂NC(Cl):NSF₅.

Inorganic Chemistry 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, Computed Properties of 1206-46-8.

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

Holfter, Hagen published the artcileInsertion of ¦Ã-SO₃ into Perfluoroalkyl- and Polyfluoroalkoxysilanes, Recommanded Product: Trimethyl(perfluorophenyl)silane, the publication is Inorganic Chemistry (1994), 33(26), 6369-72, database is CAplus.

The reactions of ¦Ã-SO₃ with the silanes R_fSi(CH₃)₃ [R_f = CF₃ (1), C₆F₅ (2), CF₂:CF (3), CF₂:CFCH₂CH₂ (8)], and R_fSi(n-C₃H₇)₃ [R_f = CF₂:CF (7), CF₂:CFCH₂CH₂ (9)] are reported. Several of the expected silyl sulfonates R_fSO₂OSi(CH₃)₃ [R_f = CF₃ (4), C₆F₅ (5), CF₂:CF (6)] are isolated. The polyfluoroalkenyltin compound CF₂:CFCH₂CH₂Sn(CH₃)₃ (10) is prepared, and also reacted with ¦Ã-SO₃; however, the tin sulfonate does not form. With fluorinated siloxanes R_fOSi(CH₃)₃ [R_f = (CF₃)₂CH (11), (CF₃)₂C(CH₃) (12), (CF₃)₂C(C₆H₅) (13), CF₃CH₂ (14), (CF₃)₃C (15), CH₂CF₂ (16)] reactions with ¦Ã-SO₃ give the resp. silyl sulfate esters R_fOSO₂OSi(CH₃)₃ in yields up to 85%. The acids CF₂:CFSO₃H (25) and (HO₃SOCH₂CF₂)₂ (26) are easily obtained by the hydrolysis of 6 and 22, resp. The compounds prepared in this study are characterized by ¹H, ¹⁹F and ²⁹Si NMR, IR and mass spectrometry.

Inorganic Chemistry 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

Kang, Taek published the artcileIridium-Catalyzed Intermolecular Amidation of sp³ C-H Bonds: Late-Stage Functionalization of an Unactivated Methyl Group, HPLC of Formula: 6084-58-8, the publication is Journal of the American Chemical Society (2014), 136(11), 4141-4144, database is CAplus and MEDLINE.

Reported herein is the iridium-catalyzed direct amidation of unactivated sp³ C-H bonds. With sulfonyl and acyl azides as the amino source, the amidation occurs efficiently under mild conditions over a wide range of unactivated Me groups with high functional group tolerance. This procedure can be successfully applied for the direct introduction of an amino group into complex compounds and thus can serve as a powerful synthetic tool for late-stage C-H functionalization. Thus, e.g., [IrCp*Cl₂]₂/AgNTf₂-catalyzed amidation of ketoxime I with TsN₃ in 1,2-DCE in presence of catalytic AgOAc afforded sulfonamide II (90%).

Journal of the American Chemical Society published new progress about 6084-58-8. 6084-58-8 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is O-Isobutylhydroxylamine hydrochloride, and the molecular formula is C4H12ClNO, HPLC of Formula: 6084-58-8.

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

Kim, Byungjun published the artcileStereodivergent Carbon-Carbon Bond Formation between Iminium and Enolate Intermediates by Synergistic Organocatalysis, COA of Formula: C8H7NO4, the publication is Journal of the American Chemical Society (2021), 143(1), 73-79, database is CAplus and MEDLINE.

Herein a stereodivergent method for the Michael addition of aryl acetic acid esters to ¦Á,¦Â-unsaturated aldehydes catalyzed by a combination of a chiral pyrrolidine and a chiral Lewis base has been reported. This reaction proceeds through a synergistic catalytic cycle which consists of one cycle leading to a chiral iminium electrophile and a second cycle generating a nucleophilic chiral enolate for the construction of a carbon-carbon bond. By varying the combinations of catalyst enantiomers, all four stereoisomers of the products with two vicinal stereocenters are accessible with high enantio- and diastereoselectivity. The products of the Michael addition, 1,5-aldehyde esters, can be readily transformed into a variety of other valuable enantioenriched structures, including those bearing three contiguous stereocenters in an acyclic system, thus providing an efficient route to an array of structural and stereochem. diversity.

Journal of the American Chemical Society published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, COA of Formula: C8H7NO4.

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

Kim, Deokjoong published the artcileWide-Bandgap Organic Crystals: Enhanced Optical-to-Terahertz Nonlinear Frequency Conversion at Near-Infrared Pumping, Computed Properties of 201157-13-3, the publication is Advanced Optical Materials (2020), 8(10), 1902099, database is CAplus.

Enhanced terahertz (THz) wave generation is demonstrated in nonlinear organic crystals through refractive index engineering, which improves phase matching characteristics substantially. Unlike conventional low-bandgap nonlinear organic crystals, the newly designed benzimidazolium-based HMI (2-(4-hydroxy-3-methoxystyryl)-1,3-dimethyl-1H-benzoimidazol-3-ium) chromophore possesses a relatively wide bandgap. This reduces the optical group index in the near-IR, allowing better phase matching with the generated THz waves, and leads to high optical-to-THz conversion. A unique feature of the HMI-based crystals, compared to conventional wide-bandgap aniline-based crystals, is their remarkably larger macroscopic optical nonlinearity, a one order of magnitude higher diagonal component in macroscopic nonlinear susceptibility than NPP ((1-(4-nitrophenyl)pyrrolidin-2-yl)methanol) crystals. The HMI-based crystals also exhibit much higher thermal stability, with a melting temperature T_m above 250 ¡ãC, vs. aniline-based crystals (116 ¡ãC for NPP). With pumping at the technol. important wavelength of 800 nm, the proposed HMI-based crystals boost high optical-to-THz conversion efficiency, comparable to benchmark low-bandgap quinolinium crystals with state-of-the-art macroscopic nonlinearity. This performance is due to the excellent phase matching enabled by decreasing optical group indexes in the near-IR through wide-bandgap chromophores. The proposed wide-bandgap design is a promising way to control the refractive index of various nonlinear organic materials for enhanced frequency conversion processes.

Advanced Optical Materials published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C14H14N2O2, Computed Properties of 201157-13-3.

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

Jeong, Cheonwoo published the artcileUse of tetraethylammonium bicarbonate as a precipitation agent on the preparation of coprecipitated Cu/ZnO catalysts, Name: Tetraethylammonium hydrogencarbonate, the publication is Applied Catalysis, A: General (2017), 35-41, database is CAplus.

Cu/ZnO catalysts were prepared by coprecipitation using tetraethylammonium bicarbonate (TEA⁺HCO₃^–), and their properties and methanol synthesis activities were compared to those of the catalysts prepared using Na⁺HCO₃^– usually employed for com. Cu/ZnO/(Al₂O₃) catalysts. When washed fully, TEA⁺– and Na⁺-based precursors showed typical zincian malachite (zM) without any other structures, and both catalysts obtained after calcination and H₂ reduction exhibited the similar specific copper surface area and, in turn, the similar methanol productivity. Since this result explains that TEA⁺ does not affect zM structure if Cu,Zn precipitate is fully washed, no washed and less washed TEA⁺– and Na⁺-based precursors were prepared It was interesting that all TEA⁺-based catalysts exhibited the similar methanol productivity irresp. of the washing efficiency whereas Na⁺-based catalyst containing more residual Na⁺ showed the smaller copper surface area and lower methanol productivity (i.e., linear correlation between the two parameters). This resulted from the inhibiting effect of Na⁺ on the degree of Cu²⁺ substitution by Zn²⁺ and the formation of high-temperature carbonate, consequently leading to a lower catalytic activity. These neg. effects of Na⁺ were absent or lessened when TEA⁺HCO₃^– was used as a precipitation agent, which is effective in preparing an active methanol synthesis catalyst.

Applied Catalysis, A: General published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Name: Tetraethylammonium hydrogencarbonate.

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

Kang, Ki-Tae published the artcileOne-Pot Catalytic Enantioselective Synthesis of Functionalized Tetrahydroquinolines by Aza-Michael/Michael Cascade Reactions of N-Protected 2-Aminophenyl ¦Á,¦Â-Unsaturated Esters with Nitroolefins, Application of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, the publication is Synthesis (2014), 46(24), 3365-3373, database is CAplus.

A highly enantioselective synthesis of functionalized tetrahydroquinolines with useful biol. properties was developed by asym. organocatalytic aza-Michael/Michael cascade reactions of nitroolefins with N-protected 2-aminophenyl ¦Á,¦Â-unsaturated esters in the presence of a chiral thiourea catalyst. The reaction gave the corresponding highly functionalized tetrahydroquinolines in good yields, excellent diastereoselectivities (>30:1 dr), and high enantioselectivities (¡Ü99% ee).

Synthesis published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, Application of 1,2-Dimethoxy-4-(2-nitrovinyl)benzene.

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

Lim, Ae Ran published the artcilePhysicochemical properties and structural dynamics of organic-inorganic hybrid [NH₃(CH₂)₃NH₃]ZnX₄ (X = Cl and Br) crystals, Related Products of catalysis-chemistry, the publication is Scientific Reports (2021), 11(1), 8408, database is CAplus and MEDLINE.

The phys. properties of the organic-inorganic hybrid crystals having the formula [NH₃(CH₂)₃NH₃]ZnX₄ (X = Cl, Br) were investigated. The phase transition temperatures (TC; 268K for Cl and 272K for Br) of the two crystals bearing different halogen atoms in their skeletons were determined through differential scanning calorimetry. The thermodn. properties of the two crystals were investigated through thermogravimetric anal. The structural dynamics, particularly the role of the [NH₃(CH₂)₃NH₃] cation, were probed through ¹H and ¹³C magic-angle spinning NMR spectroscopy as a function of temperature The ¹H and ¹³C NMR chem. shifts did not show any changes near TC. In addition, the ¹H spin-lattice relaxation time (T_1¦Ñ) varied with temperature, whereas the ¹³C T_1¦Ñ values remained nearly constant at different temperatures The T_1¦Ñ values of the atoms in [NH₃(CH₂)₃NH₃]ZnCl₄ were higher than those in [NH₃(CH₂)₃NH₃]ZnBr₄. The observed differences in the structural dynamics obtained from the chem. shifts and T_1¦Ñ values of the two compounds can be attributed to the differences in the bond lengths and halogen atoms. These findings can provide important insights or potential applications of these crystals.

Scientific Reports published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Related Products of catalysis-chemistry.

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

Gunathilaka, Buddhi E. published the artcileMarine protein hydrolysates as a substitute of squid-liver powder in diets for Pacific white shrimp (Litopenaeus vannamei), Formula: C22H32O2, the publication is Aquaculture Research (2022), 53(11), 4059-4068, database is CAplus.

This study was conducted to examine the supplementary effects of tuna hydrolyzate (TH) and shrimp hydrolyzate (SH) as squid-liver powder (SLP) replacers in a high soybean meal diet for Pacific white shrimp (Litopenaeus vannamei). A diet containing 4.49% SLP was regarded as the control diet and two other diets were prepared by supplementing 1.14% tuna hydrolyzate (TH) and 0.94% shrimp hydrolyzate (SH) (designated as SLP, TH and SH, resp.). Five replicate groups of shrimp (initial mean body weight, 0.35 ¡À 0.002 g) were fed one of the exptl. diets for 52 days. Final body weight and weight gain of shrimp fed SH and TH diets were significantly higher than those of shrimp fed SLP diet (p < 0.05). Feed conversion ratio was lower in SH group compared to that of shrimp fed other diets. Total antioxidant capacity and catalase activity were significantly higher in TH or SH group than SLP group (p < 0.05). Hemolymph glucose and triglyceride levels of shrimp fed SLP were significantly lower than those of shrimp fed TH and SH (p < 0.05). Shrimp-fed TH or SH exhibited significantly higher carcass lipid composition than shrimp-fed SLP (p < 0.05). Dry matter and protein digestibility were significantly higher in SH diet (p < 0.05). The findings in this study indicate that SH and TH can be used as beneficial feed supplements or ingredients that could replace SLP in L. vannamei diet. Optimum inclusion level of SH would be approx. 1% to completely replace SLP in L. vannamei diet containing high level of soybean meal.

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, Formula: C22H32O2.

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