Tag: M.W=200-250

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

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

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

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

Babadzhanova, Lesya A. published the artcileThe synthesis of salts and esters of perfluorinated dithio- and thiocarboxylic acids from carbon disulfide and carbonyl sulfide reacting with R_FSiMe₃/F^–, Application In Synthesis of 1206-46-8, the publication is Journal of Fluorine Chemistry (2004), 125(7), 1095-1098, database is CAplus.

Trimethyl(perfluoroalkyl)silanes react with carbonyl sulfide and carbon disulfide in the presence of fluoride ion to give salts and, after alkylation of the latter, esters of the corresponding perfluorinated thio- and dithiocarboxylic acids. Thus, reaction of Me₃SiCF₃ with [Me₄N]F and CS₂ in monoglyme at -60¡ã gave 98% tetramethylammonium trifluorodithioacetate which on alkylation with BuI in MeCN gave 95% Bu trifluorodithioacetate.

Journal of Fluorine 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, Application In Synthesis of 1206-46-8.

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

Abraham, D. J. published the artcileDesign, synthesis, and testing of potential antisickling agents. 4. Structure-activity relationships of benzyloxy and phenoxy acids, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Journal of Medicinal Chemistry (1984), 27(8), 967-78, database is CAplus and MEDLINE.

The title compounds I (R¹ = O, S, CH₂O, CH₂S, or CH₂OCH₂; R² = H, Br, Cl, F, Me, or MeO; R³ = H, Cl, F, Me, or MeO; R⁴ = H, Br, Cl, Me, NH₂, etc.; R⁵ = H, Cl, F, Me, or MeO; R⁶ = H, Br, Cl, F, or Me; R⁷ and R⁸ = H or Me) and miscellaneous compounds were prepared and evaluated in vitro for antigelling activity. 2-[(p-Bromophenoxy)ethyl]malonic?acid (II) [90296-21-2] was the most active compound A hypothesis about a mechanism to explain their effects on the O equilibrium properties of Hb is given. Structure-activity relations are discussed.

Journal of Medicinal Chemistry 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, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid.

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

Fu, Yuan-Te published the artcileBRACO19 analog dimers with improved inhibition of telomerase and hPot 1, Application In Synthesis of 38260-01-4, the publication is Bioorganic & Medicinal Chemistry (2009), 17(5), 2030-2037, database is CAplus and MEDLINE.

Human chromosomes terminate with telomeres, which contain double-stranded G-rich, repetitive DNA followed by a single-stranded overhang of the G-rich sequence. Single-stranded oligonucleotides containing G-rich telomeric repeats have been observed in vitro to fold into a variety of G-quadruplex topologies depending on the solution conditions. G-quadruplex structures are notable in part because G-quadruplex ligands inhibit both the enzyme telomerase and other telomere-binding proteins. Because telomerase is required for growth by the majority of cancers, G-quadruplex-stabilizing ligands have become an attractive platform for anticancer drug discovery. Here, we present the preparation and biochem. activities of a novel series of 3,6-disubstituted acridine dimers modeled after the known G-quadruplex ligand BRACO19. These BRACO19 Analog Dimer (BAD) ligands were shown to bind to human telomeric DNA and promote the formation of intramol. G-quadruplexes in the absence of monovalent cations. As expected, the BAD ligands bound to telomeric DNA with a 1:1 stoichiometry, whereas the parent compound BRACO19, a monomer, bound with a 2:1 stoichiometry. The BAD ligands exhibited potent inhibition of human telomerase with IC₅₀ values similar to or lower than those of BRACO19. Furthermore, the BAD ligands displayed greater potency in the inhibition of hPot1 and increased selectivity for G-quadruplex DNA when compared to BRACO19. Collectively, these experiments support the hypothesis that there is an increased potency and selectivity to be gained in the design of G-quadruplex-stabilizing agents that incorporate multiple interactions.

Bioorganic & Medicinal Chemistry published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C6H20Cl2N4, Application In Synthesis of 38260-01-4.

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

Gazizov, Mukattis B. published the artcileO, o-Dialkyl-S-(1,1-dimethyl-2-oxoethyl)dithiophosphates: Synthesis and Reactions with N-Nucleophiles, Safety of N1,N2-Dibenzylethane-1,2-diamine, the publication is Heteroatom Chemistry (2015), 26(6), 436-440, database is CAplus.

Hydrolysis of the new types of iminium salts was used to synthesize O,O-dialkyl-S-(1,1-dimethyl-2-oxoethyl)dithiophosphates or 2-dialkoxythiophosphorylthio-substituted aldehydes with C isochain. Reactions of aldehydes with N-, N,N-, and O,N-nucleophiles gave new phosphorylated imines containing an acetal group at different positions, perhydro-1,3-diazol and oxazol with the diisopropoxythiophosphorylthio group in a side chain, and hydrazone of this aldehyde and diphenylphosphinylacetic acid hydrazide.

Heteroatom 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, Safety of N1,N2-Dibenzylethane-1,2-diamine.

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

Sharghi, H. published the artcileSynthesis of new lariat ethers containing polycyclic phenols and heterocyclic aromatic compound on graphite surface via Mannich reaction, Product Details of C10H10O6, the publication is Journal of the Iranian Chemical Society (2010), 7(1), 275-288, database is CAplus.

Syntheses of novel lariat ethers containing polycyclic phenols and heterocyclic aromatic compounds using graphite via Mannich reaction were described. For this purpose N-methoxymethyl azacrown ether I was synthesized in nearly quant. yield. The reaction of I with polycyclic phenols and heterocyclic aromatic compounds was performed in 10-20 min in the presence of graphite. The graphite powder can be reused up to five times after simple washing with acetone.

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 C27H29N5, Product Details of C10H10O6.

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

Strandwitz, Nicholas C. published the artcileOne- and Two-Photon Induced Polymerization of Methylmethacrylate Using Colloidal CdS Semiconductor Quantum Dots, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Journal of the American Chemical Society (2008), 130(26), 8280-8288, database is CAplus and MEDLINE.

The development of one- and two-photon induced polymerization using CdS semiconductor quantum dots (QDs) and amine co-initiators to promote radical generation and subsequent polymerization is presented. Two-photon absorption (TPA) cross-section measurements, linear absorption, and transmission electron microscopy are used to characterize the QDs. The effectiveness of the co-initiators in increasing the efficiency of photopolymerization (polymer chains formed per excitation) is examined Triethylamine was observed to be most effective, yielding quantum efficiencies of initiation of >5%. The interactions between the co-initiators and QDs are investigated with steady-state photoluminescence and IR spectroscopies. Possible initiation mechanisms are discussed and supported by electrochem. data. Making use of the surface chem. developed here and the large QD TPA cross-sections, two-photon induced polymerization is demonstrated. The large TPA cross-sections coupled with modest quantum efficiencies for initiation reveal the unique potential of molecularly passivated QDs as efficient two-photon photosensitizers for polymerization

Journal of the American Chemical Society published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C21H24O8, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline.

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