Month: December 2022

Belfield, Kevin D. published the artcileNear-IR Two-Photon Photoinitiated Polymerization Using a Fluorone/Amine Initiating System, Name: 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Journal of the American Chemical Society (2000), 122(6), 1217-1218, database is CAplus.

A controlled 2-photon induced photopolymerization at 775 nm, employing the visible light-absorbing dye H-Nu 470 in the presence of an arylamine and (meth)acrylate monomers is described. Although the efficiency of initiation was not determined quant., qual. it was observed that polymerization occurred rapidly, even at higher scan rates and lower power.

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 C14H23N, Name: 2,6-Diisopropyl-N,N-dimethylaniline.

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

Belfield, Kevin D. published the artcileMicrofabrication via two-photon photoinitiated polymerization, Name: 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Polymeric Materials Science and Engineering (1999), 79-80, database is CAplus.

Controlled two-photon induced photopolymn, using both com. monomers (e.g., acrylate, methacrylate) and initiator systems, was demonstrated. Though the efficiency of initiation was not determined quant., qual. the polymerization occurred rapidly, even at higher scanning rates and lower power. This work paves the way for three-dimensional microfabrication of microelectromech. systems and lithog. using readily available materials.

Polymeric Materials Science and Engineering 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 C14H23N, Name: 2,6-Diisopropyl-N,N-dimethylaniline.

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

Kraft, Arno published the artcileBranched non-covalent complexes from carboxylic acids and a tris(tetrahydropyrimidine) base, Category: catalysis-chemistry, the publication is Tetrahedron (1999), 55(13), 3923-3930, database is CAplus.

Non-covalent binding of various carboxylic acids to 1,3,5-tris(1,4,5,6-tetrahydropyrimidin-2-yl)benzene 3 produced 3:1 complexes with good solubility in various non-polar organic solvents. The association constant for a model system was measured to be 61700 ¡À 11900 M^-1 in CD₃OD/CDCl₃ (97: 3), indicating the utility of this interaction between an acid and tri-basic heterocyclic amidine 3 for assembling branched complexes.

Tetrahedron 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, Category: catalysis-chemistry.

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

Sopranetti, A. published the artcilePossibilities and limitations of high performance liquid chromatography for the characterization of stabilizers and their daughter products in comparison with gas-chromatography, Computed Properties of 1821-27-8, the publication is Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] (1979), 5(1), 163-81, database is CAplus.

The determination of Ph₂NH [122-39-4], N-nitrosodiphenylamine (I) [86-30-6], 2,2′-dinitrodiphenylamine [18264-71-6], trinitrodiphenylamine [64800-21-1], and 4,4′-dinitrodiphenylamine [1821-27-8] in propellants is discussed. High-performance liquid chromatog. and gas chromatog. are compared. The former process is better for determining Ph₂NH and for determining nitramines in triple-base propellants. The latter process is better for determining the higher nitrated derivatives not containing Ph₂NH and I.

Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] 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 C6H17NO3Si, Computed Properties of 1821-27-8.

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

Sopranetti, A. published the artcileSimultaneous analysis of stabilizers and their decomposition products by gas chromatography – application of the new methods for the judging of propellants by the 65.5.degree.C surveillance test, Product Details of C12H9N3O4, the publication is Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] (1977), 73-98, database is CAplus.

Gas chromatog. (GC) is not able to sep. PH2NH (I) [122-39-4] and Ph2NNO (II) [86-30-6] in I-stabilized propellants because II is thermally unstable and is converted partially or wholly to I. An acylation product of I (with heptafluorobutyric acid anhydride) is easily synthesized at ambient temperature and has high thermal and hydrolytic stability. Moreover, the retention time of this compound is shorter than that of I and its nitration products. Thus, in GC the acylized I appears as the first peak, followed by II, which decomposed into I, and then the further nitrated I. I and its consecutive products are isolated from propellant grains by mech. crushing with no heat to a particle size <0.25 mm., followed by extraction by stirring at ambient temperature with CH2Cl2. The transformation rate of I and the formation of its consecutive products in propellants subjected to the 65.5.degree. heat test can be checked by GC. When dealing with propellants of comparable composition, the safe life can now be judged after 60 day storage.

Symposium on Chemical Problems Connected with the Stability of Explosives, [Proceedings] 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 C18H10, Product Details of C12H9N3O4.

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

Petit, Angelique published the artcileNutrient sources differ in the fertilised eggs of two divergent broiler lines selected for meat ultimate pH, SDS of cas: 6217-54-5, the publication is Scientific Reports (2022), 12(1), 5533, database is CAplus and MEDLINE.

The pHu+ and pHu- lines, which were selected based on the ultimate pH (pHu) of the breast muscle, represent a unique model to study the genetic and physiol. controls of muscle energy store in relation with meat quality in chicken. Indeed, pHu+ and pHu- chicks show differences in protein and energy metabolism soon after hatching, associated with a different ability to use energy sources in the muscle. The present study aimed to assess the extent to which the nutritional environment of the embryo might contribute to the metabolic differences observed between the two lines at hatching. Just before incubation (E0), the egg yolk of pHu+ exhibited a higher lipid percentage compared to the pHu- line (32.9% vs. 27.7%). Although 1H-NMR spectroscopy showed clear changes in egg yolk composition between E0 and E10, there was no line effect. In contrast, 1H-NMR anal. performed on amniotic fluid at embryonic day 10 (E10) clearly discriminated the two lines. The amniotic fluid of pHu+ was richer in leucine, isoleucine, 2-oxoisocaproate, citrate and glucose, while choline and inosine were more abundant in the pHu- line. Our results highlight quant. and qual. differences in metabolites and nutrients potentially available to developing embryos, which could contribute to metabolic and developmental differences observed after hatching between the pHu+ and pHu- lines.

Scientific Reports 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, SDS of cas: 6217-54-5.

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

Buitrago Santanilla, Alexander published the artcileNanomole-scale high-throughput chemistry for the synthesis of complex molecules, HPLC of Formula: 1237588-12-3, the publication is Science (Washington, DC, United States) (2015), 347(6217), 49-53, database is CAplus and MEDLINE.

At the forefront of new synthetic endeavors, such as drug discovery or natural product synthesis, large quantities of material are rarely available and timelines are tight. A miniaturized automation platform enabling high-throughput experimentation for synthetic route scouting to identify conditions for preparative reaction scale-up would be a transformative advance. Because automated, miniaturized chem. is difficult to carry out in the presence of solids or volatile organic solvents, most of the synthetic toolkit cannot be readily miniaturized. Using palladium-catalyzed cross-coupling reactions as a test case, we developed automation-friendly reactions to run in DMSO at room temperature This advance enabled us to couple the robotics used in biotechnol. with emerging mass spectrometry-based high-throughput anal. techniques. More than 1500 chem. experiments were carried out in less than a day, using as little as 0.02 mg of material per reaction. The synthesis of the target compounds was achieved using as starting materials N-(1,1-dimethylethyl)-4′-[(6-iodo-4-oxo-2-propyl-3(4H)-quinazolinyl)methyl][1,1′-biphenyl]-2-sulfonamide, (5R)-3-(3-fluoro-4-iodophenyl)-5-(1H-1,2,3-triazol-1-ylmethyl)-2-oxazolidinone, 7-[(3-bromo-4-methoxyphenyl)methyl]-1-ethyl-3,7-dihydro-8-[[(1R,2R)-2-hydroxycyclopentyl]amino]-3-(2-hydroxyethyl)-1H-purine-2,6-dione. Other reactants included (3R,4S)-3-[[[[3-bromo-5-(3-methoxypropyl)-4-methylphenyl]methyl]cyclopropylamino]carbonyl]-4-(1,2-dihydro-1-methyl-2-oxo-4-pyridinyl)-1-piperidinecarboxylic acid 1,1-dimethylethyl ester, 1-[(4-chlorophenyl)methyl]-3-[(1,1-dimethylethyl)thio]-5-(3-isoquinolinylmethoxy)-¦Á,¦Á-dimethyl-1H-indole-2-propanoic acid Me ester. Amine reactants included 1-piperazinecarboxylic acid Et ester, 1-(aminomethyl)cyclopropanecarboxylic acid ester, carbamic acid 1,1-dimethylethyl ester, 4-fluoro-2-pyridinamine, 2-thiophenesulfonamide, 2-(dimethylamino)acetamide, cyclopropanecarboximidamide, 1-methly-1H-pyrazole-2-ethanol, 2-cyano-N,N-dimethylacetamide, 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole, 2-(ethynyl)pyrazine. A series of catalysts and reagents was evaluated.

Science (Washington, DC, United States) published new progress about 1237588-12-3. 1237588-12-3 belongs to catalysis-chemistry, auxiliary class Mono-phosphine Ligands, name is 4-(2-(Di(adamantan-1-yl)phosphino)phenyl)morpholine, and the molecular formula is C30H42NOP, HPLC of Formula: 1237588-12-3.

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

Veszpremi, Tamas published the artcileInvestigation of the molecular structure of phenylhalosilanes, Safety of Difluorodiphenylsilane, the publication is Kemiai Kozlemenyek (1976), 46(3-4), 418-24, database is CAplus.

Del Re, PPP and IPPP, MO calculations for the UV spectra and dipole moments of 8 PhSiRR1X (R = R1 = X = F, Cl; R = R1 = Ph, X = F, Cl; R = X = F, Cl, R1 = Me, Ph) agreed with exptl. data. The spectra are similar to that of C6H6, with a bathochromic shift. A deformation of the F-Si-F bond angle in PhSiF3 is postulated on the basis of the difference between calculated and exptl. dipole moments.

Kemiai Kozlemenyek 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 C14H10O4, Safety of Difluorodiphenylsilane.

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

Hencsei, Pal published the artcileMolecular structure of phenylhalosilanes. I, Synthetic Route of 312-40-3, the publication is Periodica Polytechnica, Chemical Engineering (1972), 16(2), 101-12, database is CAplus.

Phenylhalosilanes were prepared and their spectra (NMR, uv, ir) determined and related to their mol. structure. Phenylbromosilanes were prepared by reacting MeCOBr with PhnSi(OEt)4-n. The uv spectra showed a bathochromic shift in the order: F, Cl, Br, in compound series of identical types. The ir spectra was used to determine frequencies corresponding to the most important vibrations and from the NMR spectra, the chem. shifts of H in the Me and Ph groups were identified. Compounds of the following type were investigated; PhSiX3, Ph2SiX2, Ph2SiMeX2 (X = F, Br, Cl).

Periodica Polytechnica, Chemical Engineering 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, Synthetic Route of 312-40-3.

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

Hunter, B. K. published the artcileChemical shifts for compounds of the Group IV elements silicon and tin, COA of Formula: C12H10F2Si, the publication is Canadian Journal of Chemistry (1968), 46(8), 1399-414, database is CAplus.

Chem. shifts for 29Si in seven series of mols. of the type XnSiY4-n have been measured where Y is an alkyl group and X varies widely in electronegativity. A considerable amount of proton and F chem. shift data has been obtained for the same compounds and in one series (CH3)nSiCl4-n the 13C chem. shifts in the Me groups have been measured. The gross features of the 29Si chem. shifts are understood by considering the series (Alkyl)3SiX with the electronegativity of X widely varied. The hybridization at Si is approx. conserved in these series and the theoretically anticipated linear dependence on electronegativity of X is demonstrated. The ligands X = O, N, and F are exceptional and these 29Si chem. shifts have a high field shift. This addnl. shielding has been associated with (p ¡ú d)¦Ð bonding. The approx. nature of present chem. shift theories is not likely to provide a measure of the order of (p ¡ú d)¦Ð bonding. The 29Si chem. shifts in the series XnSiY4-n are discussed and also indicate a net shielding effect with (p ¡ú d)¦Ð bonding. A comparison is always made with corresponding 13C chem. shifts. A long-range proton-proton coupling in mols. Me3SnX and Me2SnX2, H-C-Si-C-H is observed only when X = O, (N?), F. 119Sn chem. shifts in a series of alkyltin compounds have been measured. The same dependence on the electronegativity of X in the series (alkyl)3SnX is noted, but the variation of X is much more limited. Some shielding due to (p ¡ú d)¦Ð bonding in the series (Butyl)nSnCl4-n is suggested. The Sn chem. shift has been measured as a function of concentration and solvent for simple methyltin bromides and chlorides. In donor solvents, it has been possible to obtain equilibrium constants for complex formation from Sn dilution chem. shifts. The nature of the bonding in complexes suggested previously is consistent with the variations in the coupling constant |JSn-C-H| with concentration The distinction between ionization and complex formation with the solvent for (CH3)2SnCl2 can be made on the basis of the concentration dependence of |JSn-C-H|. The spin-lattice relaxation time T1 for 13C and 29Si in natural abundance in several pure degassed compounds has been measured. These are not in the case of 13C (as has been suggested) of the order several min., but are always <50 sec. and in one case as low as 3-4 sec. Both 29Si and 13C T1 values follow what might be expected on the basis of a dipole-dipole mechanism from the closest protons. The short value of 35 sec. in CS2 is probably a result of spin-rotation interaction in the liquid state. 46 references.

Canadian Journal of Chemistry 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, COA of Formula: C12H10F2Si.

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