Tag: M.W=200-250

Kawachi, Atsushi published the artcileo-(Fluorodimethylsilyl)phenyllithium as a Versatile Reagent for Preparation of Unsymmetrical, Silicon-Functionalized o-Disilylbenzenes, Quality Control of 312-40-3, the publication is Organometallics (2007), 26(19), 4697-4699, database is CAplus.

O-(Fluorodimethylsilyl)phenyllithium (1) was prepared by Br-Li exchange between o-C₆H₄(SiMe₂F)Br (2) and t-BuLi in Et₂O at -78¡ã. The electrophilic Si-F functionality in 1 is not attacked by the nucleophilic aryllithium moiety at that temperature ⁷Li, ¹⁹F, and ²⁹Si NMR analyses supported by DFT calculations suggested that the structure of 1 involves an intramol. coordination of the F substituent to the Li atom. Reactions of 1 with halosilanes produced unsym., Si-halogenated o-disilylbenzenes 4.

Organometallics published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Quality Control of 312-40-3.

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

Lautens, Mark published the artcileCobalt-Catalyzed [2¦Ð + 2¦Ð + 2¦Ð] (Homo-Diels-Alder) and [2¦Ð + 2¦Ð + 4¦Ð] Cycloadditions of Bicyclo[2.2.1]hepta-2,5-dienes, HPLC of Formula: 4141-48-4, the publication is Journal of the American Chemical Society (1995), 117(26), 6863-79, database is CAplus.

The scope of the cobalt-catalyzed [2¦Ð + 2¦Ð + 2¦Ð] (homo-Diels-Alder, HDA) and [2¦Ð + 2¦Ð + 4¦Ð] cycloaddition reactions with norbornadienes has been investigated. Cobalt acetylacetonate, Co(acac)₃ or Co(acac)₂, upon reduction by diethylaluminum chloride (Et₂AlCl) in the presence of 1,2-bis(diphenylphosphino)ethane (dppe), is very effective in promoting the HDA reaction between norbornadiene and a variety of unactivated acetylenes to yield deltacyclenes. Azeotropic drying of the cobalt compound before use is found to increase the reactivity of the catalyst. Moderate to excellent enantioselectivity of these [2¦Ð + 2¦Ð + 2¦Ð] (up to 91% ee) and [2¦Ð + 2¦Ð + 4¦Ð] (up to 79% ee) cycloadditions can be achieved by the use of a chiral phosphine. 7-Substituted norbornadienes are also found to be reactive in the cobalt-catalyzed HDA reactions, affording the corresponding deltacyclenes in good yields. However, low anti/syn selectivities are observed, in contrast with the corresponding nickel-catalyzed HDA reaction with electron-deficient dienophiles. 2-Substituted norbornadienes are found to be less reactive in the cobalt-catalyzed HDA reactions, and the regio- and stereoselectivities are only moderate. The intramol. versions of these [2¦Ð + 2¦Ð + 2¦Ð] and [2¦Ð + 2¦Ð + 4¦Ð] cycloadditions have also been investigated and provide efficient methods for the construction of highly strained pentacyclic frameworks from norbornadiene.

Journal of the American Chemical Society 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, HPLC of Formula: 4141-48-4.

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

Kawachi, Atsushi published the artcileStructures of [(Amino)phenylsilyl]lithiums and Related Compounds in Solution and in the Solid State, Category: catalysis-chemistry, the publication is Journal of the American Chemical Society (2000), 122(9), 1919-1926, database is CAplus.

The solution structures of [bis(diethylamino)phenylsilyl]lithium (1), [(diethylamino)diphenylsilyl]lithium (2), and [(diethylamino)phenylmethylsilyl]lithium (3) were studied by ¹³C, ²⁹Si, ⁷Li, and ¹⁵N NMR spectroscopic experiments The ²⁹Si-⁷⁽⁶⁾Li coupling can be observed in each species at low temperature The coupling patterns indicate that these three species exist as monomers in THF. Using a ¹⁵N-enrichment technique, the ²⁹Si-¹⁵N couplings in 1 and 2 are observed Next, the solid-state structures of [(diphenylamino)diphenylsilyl]lithium ((Ph₂N)Ph₂Si-X; X = Li) (4) and its fluoro (X = F), stannyl (X = SnMe₃), and hydro (X = H) derivatives were revealed by crystallog. studies as well as by solid-state ²⁹Si NMR experiments In the solid state, 4 exists as a monomer solvated with three THF mols. arising from the reaction solvent. The electropos. substituent X, such as Li, causes the elongation of the Si-C and Si-N bonds, reduction of the sum of the C-Si-N (or C) angles, and a downfield shift of the ²⁹Si resonances.

Journal of the American Chemical Society published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Category: catalysis-chemistry.

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

Piela, Katarzyna published the artcileElectrical Anharmonicity and Vibronic Couplings Contributions to Optical Nonlinearity of N-Benzyl-2-methyl-4-nitroaniline Crystal Studied by FT-IR, Polarized FT-NIR, Resonance Raman and UV-Vis Spectroscopy, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline, the publication is Journal of Physical Chemistry A (2012), 116(7), 1730-1745, database is CAplus and MEDLINE.

FTIR and Raman spectra of the orthorhombic and monoclinic N-benzyl-2-methyl-4-nitroaniline (BNA) single crystals, powders, and BNA solutions were measured in the 15-4000 cm^-1 range, and complete assignments of bands to normal vibrations are proposed. The assignments were reinforced by d. functional theory (DFT) calculations Polarized FT-NIR spectra of the orthorhombic (010) BNA plate were measured for the overtones and combinations anal. and for the mech. and elec. anharmonicity estimation Resonance Raman spectra of the orthorhombic BNA polymorph together with the resonance excitation profiles of fundamental and lattice vibrations, compared with the band maxima in the measured UV-visible-NIR spectra of BNA, revealed vibronic couplings with intramol. and intermol. charge transfers. The role of anharmonicity, vibronic couplings and intermol. H bonds and of the N-benzyl substituent are discussed and the origin of 2nd harmonic generation in the orthorhombic BNA crystal is proposed.

Journal of Physical Chemistry A 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, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline.

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

Luadthong, C. published the artcileSynthesis and characterization of micro/nanoparticles of poly(vinylalcohol-co-vinylcinnamate) derivatives, Synthetic Route of 16909-09-4, the publication is European Polymer Journal (2008), 44(5), 1285-1295, database is CAplus.

Various poly(vinylalc.-co-vinylcinnamate) derivatives including poly(vinylalc.-co-vinylcinnamate), poly(vinylalc.-co-vinyl-4-methoxycinnamate), poly(vinylalc.-co-vinyl-2,4-dimethoxycinnamate) and poly(vinylalc.-co-vinyl-2,4,5-trimethoxycinnamate) were synthesized by grafting poly(vinylalc.) with appropriate cinnamoyl groups. The self-assembly of grafted products into spherical micellar nanoparticles was performed, and particles were analyzed using dynamic light scattering, SEM, and transmission electron microscopy. ¹H NMR analyses of the well-dispersed micellar particle suspensions and polymer solutions indicated that the hydroxyl groups of the polymer were on the outer surface of the spheres, while the cinnamoyl moieties were buried inside the spheres forming crystalline structure. Polymer with a higher degree of cinnamoyl substitution gave smaller particles upon self-assembly. Variations in particle sizes obtained from PV(OH) grafted with cinnamoyl derivatives of different methoxy substitution on the benzene ring were observed Mol. weight of the polymers did not significantly affect nanoparticle size and morphol. In addition, self-assembly of the poly(vinylalc.-co-vinylcinnamate) derivatives into hollow reverse micellar microparticles of uniform size was also demonstrated. ¹H NMR spectrum of the reverse micellar micro-particle suspension indicated that the cinnamoyl moieties were not in a crystalline state.

European Polymer Journal 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, Synthetic Route of 16909-09-4.

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

Hashimoto, Hideki published the artcileCharacteristics of the terahertz radiation from single crystals of N-substituted 2-methyl-4-nitroaniline, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline, the publication is Journal of Physics: Condensed Matter (2001), 13(23), L529-L537, database is CAplus.

Terahertz (THz) radiation was generated via optical rectification from organic single crystals, i.e. N-substituted (N-benzyl, N-diphenylmethyl, and N-2-naphthylmethyl) derivatives of 2-methyl-4-nitroaniline (MNA), and it was detected by means of the electrooptic sampling method. The intensity and the spectrum of the THz radiation were compared with those of ZnTe and DAST (N,N-dimethylamino-N’-methylstilbazolium p-toluenesulfonate) crystals. The integrated intensity of the THz radiation from the N-benzyl-MNA crystal was two thirds of that for the ZnTe crystal, the best-known practical THz emitter, and was as intense as that for the DAST crystal, the best organic THz emitter ever studied. The spectrum of the ZnTe crystal extended to 3 THz, while that of the N-benzyl MNA and DAST crystals dropped off around 2.5 THz. The THz radiation intensities from all of the organic crystals were compared quant., on the basis of the consideration of mol. arrangements in the crystals. It was suggested that the absorption due to low-frequency phonon modes affected both the intensity and the spectral band shape of the THz radiation.

Journal of Physics: Condensed Matter 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, Recommanded Product: N-Benzyl-2-methyl-4-nitroaniline.

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

Yamamoto, Yoshihiko published the artcileSynthesis of ¦Ã-trifluoromethyl tetronate derivatives from squarates, Quality Control of 1206-46-8, the publication is Heterocycles (2017), 95(1), 525-539, database is CAplus.

Squarates and semisquarates were treated with TMSCF₃ in the presence of a catalytic amount of AcONa in DMF at room temperature to afford 4-trifluoromethyl-4-hydroxycyclobutenones. Subsequent oxidative ring expansion of these products was performed using Pb(OAc)₄ in the presence of MS 4A in 1,2-dichloroethane at 50¡ã to afford ¦Ã-trifluoromethyl tetronate derivatives

Heterocycles 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 C6H20Cl2N4, Quality Control of 1206-46-8.

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

Hirajima, Tsuyoshi published the artcileQuantitative determination of fatty acid salts and alkyl amine salts by infrared analysis method, COA of Formula: C14H31NO2, the publication is Nippon Kogyo Kaishi (1980), 96(1114), 897-900, database is CAplus.

Fatty acid salts, Na oleate and Na palmitate (1-7) ¡Á 10^-5M, and alkyl amine salts, dodecylammonium acetate (I) (1-7) ¡Á 10^-5M, in aqueous solutions (used as collectors in nonsulfide mineral flotation) were determined by IR absorption spectrometry at 3.4-3.5 ¦Ìm, after extraction with CCl₄ at pH <2.9 and >10.6 for Na oleate and palmitate and pH <1.5-2.5 and >13.0-13.5 for I.

Nippon Kogyo Kaishi 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, COA of Formula: C14H31NO2.

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

Tsunekawa, Masami published the artcileInterfacial characteristics of barite, calcite, and scheelite in aqueous solution, and their flotation, Category: catalysis-chemistry, the publication is Nippon Kogyo Kaishi (1981), 97(1118), 251-6, database is CAplus.

A surface chem. study was made on the floatability of barite??[13462-86-7] and calcite??[13397-26-7] and scheelite??[14913-80-5] with dodecyl?ammonium?acetate (DAA) [2016-56-0] and sodium?dodecyl?sulfate (SDS) [151-21-3]. Floatability of barite changed when pH deviated from the equivalence point, EP (pH = 7.6), due to the surface hydrolysis. EP compared well with the isoelec. point. Barite was well floated with SDS, irresp. of pH, because of the chem. adsorption of SDS. The flotation of calcite changed considerably with pH, due to the change in the concentration of chem. species in the aqueous phase with pH.

Nippon Kogyo Kaishi 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 C12H6F6O6S2, Category: catalysis-chemistry.

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

Notake, Takashi published the artcileCharacterization of all second-order nonlinear-optical coefficients of organic N-benzyl-2-methyl-4-nitroaniline crystal, Product Details of C14H14N2O2, the publication is Scientific Reports (2019), 9(1), 1-8, database is CAplus and MEDLINE.

Full elements of second-order nonlinear optical (NLO) tensor can be completely characterized for an organic NLO crystal for the first time. As-grown bulk N-benzyl-2-methyl-4-nitroaniline (BNA) crystal was processed to expose (100) and (010) crystal orientations with fine optical surfaces by using precision lathe and diamond blade. Then, every five nonvanishing second-order NLO coefficient of BNA can be determined quant. using the precisely processed crystals based on 1st-kind Maker fringe measurements. Our method makes it possible to clarify uncertain NLO property of any organic materials and to accelerate application study via precise device fabrications even for fragile organic materials.

Scientific Reports 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, Product Details of C14H14N2O2.

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