Tag: M.W=200-250

Adhikari, Birendra Babu published the artcileAllosteric effect of the first lead ion on stepwise extraction of the second lead ion with p-t-butylcalix[5]arene pentacarboxylic acid derivative, COA of Formula: C12H16O3, the publication is Tetrahedron Letters (2010), 51(27), 3481-3485, database is CAplus.

A calix[5]arene-based solvent extraction reagent displaying very high selectivity for lead has been prepared, one mol. of which extracts two lead ions in a stepwise manner. The first Pb²⁺ ion is bound to five phenoxy oxygen atoms inside the calixarene cavity due to which the ligand undergoes conformational freezing in stable cone conformer. This causes pos. allosteric effect for co-extraction of the second lead ion due to the aggregation of functional groups.

Tetrahedron 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 C12H16O3, COA of Formula: C12H16O3.

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

Nozaki, Toru published the artcileComplex formation of (1-hydroxyethylidene)bisphosphonic acid and flotation with the complexes, Application of Dodecylamineacetate, the publication is Nippon Kagaku Kaishi (1989), 697-701, database is CAplus.

From the polarog. behavior of Cu(II), Pb(II), Cd(II), and Mn(II) ions in (1-hydroxyethylidene)bisphosphonic acid (HEBP, H₅L) solutions at an ionic strength of 0.4 mol/dm³ adjusted with sodium perchlorate, the compositions of the metal complexes and their stability constants were determined The species of MH₃L, MH₂L^–, MHL^2-, M(H₃L)₂^2-, M(H₃L)H₂L^3-, M(H₂L)₂^4-, and M(H₂L)HL^5- for Cu and Mn, and same species except MH₂L^– and MHL^2- for Cd, were found at pH 4.6-6.4. Species of MHL^2-, ML^3-, M(OH)L^4-, M(HL)₂^6-, and ML₂^8- were found in the pH ranges 11.5-12.9 for Pb(II). The flotation of HEBP by complexing with Fe(III) and the HEBP complexes was investigated. Recoveries of 4.0 ¡Á 10^-4 mol/dm³ of HEBP and the HEBP complexes of Cu(II), Pb(II) and Mn(II) were 99.6%, and 99.6, 98.6 and 91.5%, resp., by the flotation for about 5 min using (1.2 ? 1.6) ¡Á 10^-3 mol/dm³ of dodecylammonium acetate (DAA) as a surfactant at pH 6.0-9.5. The presence of 6382 ppm of Cl^–, 3840 ppm of SO₄^2- and 3100 ppm of NO₃^– did not interfere the flotation. Flotation of HEBP and the complexes proceeds through the formation of ion pair Rn_?MHi_?L, where n? = 5-n-i?, R and n denoting the cation of DAA and the charge of the metal, resp.

Nippon Kagaku 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, Application of Dodecylamineacetate.

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

Itoh, Shinichi published the artcileFloatability of minerals from the tailings of tin ore dressing, Category: catalysis-chemistry, the publication is Tohoku Kogyo Gijutsu Shikensho Hokoku (1983), 21-6, database is CAplus.

Tantalite??[12178-48-2] is separated from cassiterite??[1317-45-9] by flotation with dodecylamine?acetate??[2016-56-0] because fine grinding is necessary to liberate the minerals and electrostatic separation is difficult to apply. The most important factor in the flotation is the electrochem. property of the solid-liquid interface, and the zeta-potential pH was determined as follows: tantalite 3.5, ilmenite??[12168-52-4], tourmaline, zircon, cassiterite 5.0, monazite??[1306-41-8], xenotime 6.0. Tantalite can be separated from monoazite at low pH because of the difference in zeta-potential, and adsorption of SO₄^2- on the tantalite surface.

Tohoku Kogyo Gijutsu Shikensho Hokoku 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, Category: catalysis-chemistry.

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

Hashimoto, H. published the artcileSecond harmonic generation from the single crystals of N-substituted 4-cyanoanilines, Category: catalysis-chemistry, the publication is Journal of Luminescence (2000), 886-888, database is CAplus.

Six N-substituted derivatives of 4-cyanoaniline (pCA) were synthesized and their phys. and optical properties were examined in the search for 2nd-order nonlinear optical materials with enough crystal dimensions together with blue-light transparency. Among the derivatives examined, N-diphenylmethyl-pCA and N-2-naphthylmethyl-pCA afforded single crystals that lack a center of symmetry. Although the 2nd harmonic (SH) activities of these derivatives were not enough for the practical purposes, their cut-off wavelengths were shorter than 330 nm and showed sufficient blue-light transparency. Quant. prediction of the SH activity was also attempted.

Journal of Luminescence 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, Category: catalysis-chemistry.

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

Hashimoto, Hideki published the artcileSecond-harmonic generation from single crystals of N-substituted 4-nitroanilines, Name: N-Benzyl-2-methyl-4-nitroaniline, the publication is Japanese Journal of Applied Physics, Part 1: Regular Papers, Short Notes & Review Papers (1997), 36(11), 6754-6760, database is CAplus.

Six N-substituted derivatives of 2-methyl-4-nitroaniline (MNA) and two N-substituted derivatives of 4-nitroaniline were synthesized and their phys. and optical properties were examined in the search for nonlinear optical materials with a sufficiently large 2nd harmonic (SH) activity and applicability to practical use. Some derivatives produced single crystals and their structures were determined by x-ray crystallog. The trends of the SH intensity of these materials could be qual. explained based on the b tensor (the effective mol. hyper-polarizability in the crystal). Amongst the derivatives examined N-benzyl-MNA showed the highest SH activity (up to twice that of MNA), thermostability and phase-matching ability.

Japanese Journal of Applied Physics, Part 1: Regular Papers, Short Notes & Review Papers 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, Name: N-Benzyl-2-methyl-4-nitroaniline.

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

Ohya, Yuki published the artcileRe-evaluation of the indications for liver transplantation in Wilson’s disease based on the outcomes of patients referred to a transplant center, Related Products of catalysis-chemistry, the publication is Pediatric Transplantation (2013), 17(4), 369-373, database is CAplus and MEDLINE.

The aim of this study was to re-evaluate the indications and timing of LT for WD. From 2000 to 2009, eight patients with WD who had been referred to our institution for LT were enrolled in this study. The mean patient age was 15.9 yr (range, 7-37 yr). Four patients could not receive LT, because there were no available donors. All four patients were treated with chelating agent medication. Three of them (two of two patients with fulminant WD and one of two with cirrhotic WD) who did not undergo LT are still alive and doing well with stable liver functional tests. Only one of the patients with cirrhotic WD who did not undergo LT died of hepatic failure. Even among the four patients who underwent LT, one with fulminant WD recovered from hepatic encephalopathy with apheresis therapy and chelating agent. He later required LT because of severe neutropenia from D-penicillamine. The other three patients who underwent LT recovered and have been doing well. Some of the patients with WD can recover and avoid LT with medical treatment. Even when WD has progressed liver cirrhosis and/or fulminant hepatic failure at the time of diagnosis, medical treatment should be tried before considering LT.

Pediatric Transplantation 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, Related Products of catalysis-chemistry.

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

Fukata, Yukihiro published the artcileAsymmetric Isomerization of ¦Ø-Hydroxy-¦Á,¦Â-Unsaturated Thioesters into ¦Â-Mercaptolactones by a Bifunctional Aminothiourea Catalyst, Recommanded Product: 2,4,6-Triisopropylbenzenethiol, the publication is Organic Letters (2014), 16(8), 2184-2187, database is CAplus and MEDLINE.

We present a novel methodol. for the asym. synthesis of ¦Â-mercaptolactones via isomerization of ¦Ø-hydroxy-¦Á,¦Â-unsaturated thioesters by means of a bifunctional aminothiourea catalyst. The catalyst interacts with the substrate through the cooperative action of both a covalent bond at the amino group and noncovalent bonding at the thiourea group. The potential for an enantiodivergent synthesis could also be demonstrated by carrying out the reaction in a different solvent system.

Organic Letters 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, Recommanded Product: 2,4,6-Triisopropylbenzenethiol.

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

Krupoder, S. A. published the artcileIntramolecular interactions in aromatic compounds: V. Electronic structure of polyfluoroaromatic silanes and related hydrocarbons, Recommanded Product: Trimethyl(perfluorophenyl)silane, the publication is Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) (2000), 70(1), 101-110, database is CAplus.

The electronic structure of pentafluorophenyl-substituted silanes Ar_nSiMe_4-n (Ar = C₆H₅, C₆F₅, 4-FC₆H₄, 2,3,5,6-F₄C₅N; n = 1; Ar = C₆H₅, C₆F₅, n = 2, 4) was studied by x-ray emission and He(I) photoelectron spectroscopy. The He(I) photoelectron spectra were measured and interpreted from MNDO calculations, anal. of the p-fluoro effect, and relative intensities. Substitution of C₆F₅ for C₆H₅ in aryltrimethyl- and diaryldimethylsilanes results in enhanced ¦Ð interaction between the aryl and SiMe_n groups (n = 2, 3) by higher ¦Ð levels and has almost no effect on the charge on the Si atom.

Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) 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

Ashikari, Yosuke published the artcileIntegrated Electrochemical-Chemical Oxidation Mediated by Alkoxysulfonium Ions, SDS of cas: 457-68-1, the publication is Journal of the American Chemical Society (2011), 133(31), 11840-11843, database is CAplus and MEDLINE.

Generation of carbocations by the cation pool method followed by reaction with DMSO gave the corresponding alkoxysulfonium ions. Alkoxysulfonium ions could also be generated by in situ DMSO trapping of electrochem. generated carbocations. The resulting alkoxysulfonium ions were transformed into carbonyl compounds by treatment with triethylamine. The present integrated electrochem.-chem. oxidation can be applied to the oxidation of diarylmethanes to diaryl ketones, toluenes to benzaldehydes, and aryl-substituted alkenes to 1,2-diketones. Also, the oxidation of unsaturated compounds bearing a nucleophilic group in an appropriate position gives cyclized carbonyl compounds

Journal of the American Chemical Society published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C13H10F2, SDS of cas: 457-68-1.

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

Look, Kai published the artcileFormation by S_RN1 reactions and ¹H N.M.R. properties of sterically encumbered 2,4,6-trialkylphenyl p-nitrobenzyl sulfides, Safety of 2,4,6-Triisopropylbenzenethiol, the publication is Australian Journal of Chemistry (1999), 52(11), 1077-1083, database is CAplus.

Sterically hindered p-nitrobenzylic chlorides react with the sodium salts of 2,4,6-trialkylbenzenethiols by the S_RN1 reaction to give good yields of the corresponding p-nitrobenzylic aryl sulfides. For example, the reaction of sodium 2,4,6-triisopropylbenzenethiolate with ¦Á-t-butyl-¦Á-methyl-p-nitrobenzyl chloride gives the sulfide in over 80% yield after 2 h at room temperature in Me₂SO. Only in reactions involving 2,4,6-tri-t-butylbenzenethiol are low yields or failed reactions encountered. Qual. examination of the dynamic NMR spectra of the sulfides prepared in these reactions shows that up to three restricted rotational phenomena can be identified. These are rotation about the benzylic-carbon to p-nitrophenyl ring bond, rotation about the sulfur to aromatic ring bond, and rotation about the bond joining the t-Bu group to the benzylic carbon. The last phenomenon produces the relatively rare and unusual situation wherein the t-Bu group appears as three distinct Me resonances at low temperatures

Australian Journal of Chemistry 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, Safety of 2,4,6-Triisopropylbenzenethiol.

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