Tag: M.W=200-250

Salmon, Lionel published the artcileTwo Novel Iron(II) Materials Based on Dianionic N₄O₂ Schiff Bases: Structural Properties and Spin-Crossover Characteristics in the Series [Fe(3-X,5-NO₂-sal-N(1,4,7,10))] (X = H, 3-MeO, 3-EtO), SDS of cas: 38260-01-4, the publication is Inorganic Chemistry (2005), 44(6), 1763-1773, database is CAplus and MEDLINE.

Two spin-crossover (SCO) complexes [Fe^II(3-MeO,5-NO₂-sal-N(1,4,7,10))] (1) and [Fe^II(3-EtO,5-NO₂-sal-N(1,4,7,10))] (2) were prepared and studied (3-MeO,5-NO₂-sal-N(1,4,7,10) and 3-EtO,5-NO₂-sal-N(1,4,7,10) are deprotonated 2-[12-(hydroxy-3-methoxy-5-nitrophenyl)-2,5,8,11-tetraazadodeca-1,11-dien-1-yl]-2-methoxy-4-nitrophenol and 2-[12-(hydroxy-3-ethoxy-5-nitrophenyl)-2,5,8,11-tetraazadodeca-1,11-dien-1-yl]-2-ethoxy-4-nitrophenol, resp.). The x-ray diffraction anal. of complex 1 evidenced the same Pbnb orthorhombic system at 160 K (high-spin (HS) state) and 100 K (low-spin (LS) state). At 160 K, a 8.4810(9), b 14.7704(14), c 18.769(2) ?, V = 2351.2(4) ?³, and Z = 4. At 100 K, a 8.5317(8), b 14.4674(15), c 18.814(2) ?, and V = 2322.2(4) ?³. Complex 2 crystallizes in the P1? triclinic system. At 160 K (HS state), a 10.265(4), b 10.861(4), c 14.181(5) ?, ¦Á 84.18(4), ¦Â 70.53(5), ¦Ã 88.95(5)¡ã, V = 1482.6(10) ?³, and Z = 2. The Fe(II) coordination sphere is distorted octahedral in 1 and 2 with a cis-¦Á arrangement of the N₄O₂ donor set of the hexadentate ligand. The mols. are connected into 1-dimensional infinite chains through H contacts involving the secondary amine functions and O_nitro atoms of the ligands in adjacent mols. Study of their magnetic properties and Mossbauer spectra revealed very different SCO behaviors: complex 1 exhibits a cooperative SCO without residual LS or HS fraction; complex 2 shows a LS ? HS SCO involving ?5% of the Fe^II ions in the 30-150 K range. The phenomenol. cooperative interaction parameter J = 138 K evaluated from the area of the hysteresis loop indicates a cooperative effect weaker in 1 than in [Fe^II(5NO₂-sal-N(1,4,7,10))]. The theor. approach to the SCO in 2 indicates a HS ground state and a LS 1st excited level 53 K above: the thermal dependence of the system occurs through population of vibrational states. Comparison of the structural and electronic properties of the ferrous SCO materials with parent N₄O₂ ligands shows that the properties of SCO are closely related to intermol. interactions and crystal packing.

Inorganic 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, SDS of cas: 38260-01-4.

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

Schmieder-van de Vondervoort, Lizette published the artcileLow temperature, high conversion, liquid-phase benzylic oxidation with dioxygen by metal/NHPI-catalyzed Co-oxidation with benzaldehyde, Computed Properties of 457-68-1, the publication is European Journal of Organic Chemistry (2003), 578-586, database is CAplus.

A new liquid-phase catalytic oxidation system for the low temperature, high conversion benzylic mono-oxyfunctionalization of 5H-dibenz[b,f]azepine-5-carboxamide (I) into oxcarbazepine with dioxygen has been developed. The method is based on a co-oxidation of I with benzaldehyde in the presence of a four-component catalyst system consisting of Co(OAc)₂, Ni(OAc)₂, Cr(NO₃)₃, and N-hydroxyphthalimide (NHPI). The influence of the catalyst system on the formation and decomposition of the crucial hydroperoxide intermediate has been investigated. Based on these results, the role of each of the components in the catalyst system is discussed. The scope of this method for the oxidation of other substrates has been studied, and the results are compared with those obtained by Co/NHPI catalyzed oxidation of these substrates.

European Journal of Organic Chemistry 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, Computed Properties of 457-68-1.

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

Voronkov, M. G. published the artcileReaction of organyltrifluorosilanes with dimethylsulfoxide and dimethylformamide and its spectroscopic investigation, Related Products of catalysis-chemistry, the publication is Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) (2001), 71(12), 1865-1868, database is CAplus.

Reaction of organotrifluorosilanes RSiF₃ (R = C₆H₅, 3-O₂NC₆H₄, and C₆H₅CH₂) with DMSO and DMF (B) gave the complexes 2B¡¤SiF₄ and R₂SiF₂. Besides, biphenyl, benzene, Me(fluoromethyl)sulfoxide, and S,S’-dimethyldisulfide-S,S’-dioxide CH₃S(O)S(O)CH₃ were either isolated or identified by chromatomass-spectrometry. Speculative mechanism of the reaction proceeding is discussed. IR spectra of the reaction mixtures and those of 2B¡¤SiF₄ adduct were studied in details; they indicate octahedron structure of the complex with cis arrangement of B ligands.

Russian Journal of General Chemistry (Translation of Zhurnal Obshchei Khimii) 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 C9H12O, Related Products of catalysis-chemistry.

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

Wichmann, Kathrin A. published the artcileCharacterization of Dicarboxylic Salts of Protonated Triethylenetetramine Useful for the Treatment of Copper-Related Pathologies, Related Products of catalysis-chemistry, the publication is Crystal Growth & Design (2007), 7(9), 1844-1850, database is CAplus.

X-ray crystal structures of three salts of protonated triethylenetetramine, (H₄TETA)⁴⁺, with succinate, maleate, and fumarate anions are reported. Structures of the complexes (H₄-triethylenetetramine)(hydrogenmaleate)₄¡¤2H₂O [(H₄TETA)(Hmal)₄¡¤2H₂O], (H₄-triethylenetetramine)(hydrogenfumarate)₄¡¤3.3H₂O [(H₄TETA)(Hfum)₄¡¤3.3H₂O], and (H₄-triethylenetetramine)(succinate)₂ [(H₄TETA)(suc)₂] all form assemblies of alternating two-dimensional layers of (H₄TETA)⁴⁺ and the anionic species via hydrogen-bond networks. Both classical and nonclassical hydrogen bonds between the protonated amine groups, anions, and water mols. were observed X-ray powder diffraction measurements, DTA/thermogravimetry, d. vapor sorption, and Karl Fischer titration measurements were performed to obtain confirmatory information about the water content in the structures [(H₄TETA)(Hmal)₄¡¤2H₂O] and [(H₄TETA)(Hfum)₄¡¤3.3H₂O] and to examine polymorphism within the salts. The nonhydrated salt [(H₄TETA)(suc)₂] was determined to be the most favorable salt formulation for use in medicinal applications.

Crystal Growth & Design 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 C11H12O4, Related Products of catalysis-chemistry.

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

Block, Eric published the artcileMercury(II) and methylmercury(II) complexes of novel sterically hindered thiolates: carbon-13 and mercury-199 NMR studies and the crystal and molecular structures of [MeHg(SC₆H₂-2,4,6-Pr-iso₃)], [Hg(SC₆H₄-2-SiMe₃)₂], [Hg(2-SC₅H₃N-3-SiMe₃)₂], and [Hg{(2-SC₆H₄)₂SiMe₂}]₂, Application of 2,4,6-Triisopropylbenzenethiol, the publication is Inorganic Chemistry (1990), 29(17), 3172-81, database is CAplus.

Several series of complexes of the types [MeHg(SR)] and [Hg(SR)₂] were synthesized, where the ligands are members of new classes of sterically hindered thiolates, including (triorganosilyl)methanethiols, 2-(triorganosilyl)benzenethiols, 3-(triorganosilyl)pyridine-2-thiols, and bis(2-mercaptophenyl) derivatives Detailed ¹H, ¹³C, and ¹⁹⁹Hg NMR studies revealed several general trends. The ¹⁹⁹Hg chem. shifts moved upfield in the order [MeHg(SR)] < [Hg(SCR’R”R”’)₂] < [Hg(S-aryl)₂] < [Hg(S-pyridyl)₂]. For the [MeHg(SR)] series of complexes, ¹J(Hg-C) correlates with ¦Ä(¹³C(methyl)) and with the type of thiolate ligand. Anomalous behavior is observed for oligomeric species. There is only a limited correlation of ¦Ä(¹⁹⁹Hg) with steric cone angles for a subset of the complexes. The structures of 4 of these complexes, I–IV, were determined by x-ray crystallog.

Inorganic 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, Application of 2,4,6-Triisopropylbenzenethiol.

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

Hirajima, T. published the artcileFloatability of rare earth phosphors from waste fluorescent lamps, Computed Properties of 2016-56-0, the publication is International Journal of Mineral Processing (2005), 77(4), 187-198, database is CAplus.

Zeta-potential measurements were made to determine the elec. state of phosphor materials on the basis of which a feasibility study can be performed for the use of flotation in the recovery of fine (median size <13 μm) rare earth phosphors from waste fluorescent lamps. Tests were carried out on specimens of white (calcium halo-phosphate), red, green and blue (rare earth) phosphors in a 17:1:1:1 ratio of their mixture, and with actual waste phosphor materials. The effects of a cationic, dodecyl ammonium acetate (DAA), and two anionic, sodium dodecyl sulfate (SDS) and sodium oleate collectors on the floatability of materials, as well as that of Na₂SiO₃ dispersant on the separation characteristics, were investigated in different pH ranges. The process, applied to actual discarded waste phosphors gave, in a two-stage separation scheme, sink products assaying 17.7-23.8 and 21.5-25.9% rare earth phosphors for DAA and SDS flotation, resp. The recovery and Newton’s efficiency were about 70-90%/0.26-0.37 and 66-82%/0.18-0.20 for DAA and SDS flotation, resp.

International Journal of Mineral Processing 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, Computed Properties of 2016-56-0.

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

Baechler, Raymond D. published the artcileContrasting thermal reactions of allylic sulfilimines and phosphinimines, Category: catalysis-chemistry, the publication is Tetrahedron Letters (1988), 29(42), 5353-4, database is CAplus.

Allylic sulfilimines and phosphinimines undergo spontaneous but contrasting rearrangements at low temperatures Whereas PhN:SPhCH₂CH:CH₂ is converted to isomeric sulfenamide PhN(SPh)CH₂CH:CH₂ by (2,3)-sigmatropic rearrangement, structurally analogous phosphinimine PhN:PPh₂CH₂CH:CH₂ undergoes an unusually facile double bond shift to form PhN:PPh₂CH:CHMe with an isomeric vinylic structure.

Tetrahedron Letters 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, Category: catalysis-chemistry.

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

Das, Shoubhik published the artcileMetal-Free Catalyst for the Chemoselective Methylation of Amines Using Carbon Dioxide as a Carbon Source, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline, the publication is Angewandte Chemie, International Edition (2014), 53(47), 12876-12879, database is CAplus and MEDLINE.

N-methylation of amines is an important step in the synthesis of many pharmaceuticals and has been widely applied in the preparation of other key intermediates and chems. Therefore, the development of efficient methylation methods has attracted considerable attention. In this respect, carbon dioxide is an attractive C₁ building block because it is an abundant, renewable, and nontoxic carbon source. Consequently, we developed a highly chemoselective, metal-free catalytic system that operates under ambient conditions for the N-methylation of amines.

Angewandte Chemie, International Edition 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, Recommanded Product: 2,6-Diisopropyl-N,N-dimethylaniline.

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

Chen, Qin published the artcileSynthesis and characterization of platinum(II)-thiolate complexes. Crystal and molecular structures of cis-Pt(Ph₃P)₂(SC₆H₂-2,4,6-iPr₃)Cl and cis-Pt(Ph₃P)₂(SC₆H₂-2,4,6-iPr₃)₂, COA of Formula: C15H24S, the publication is Inorganica Chimica Acta (1994), 216(1-2), 83-7, database is CAplus.

The reaction of cis-Pt(Ph₃P)₂Cl₂ with 2,4,6-triisopropylbenzenethiol (HTIPT) in benzene at 65° yields yellow crystals of cis-[Pt(Ph₃P)₂(TIPT)Cl] (1), while the reaction of cis-Pt(Ph₃P)₂Cl₂ and HTIPT in benzene at room temperature yields cis-[Pt(Ph₃P)₂(TIPT)₂] (2). In contrast to the tendency of solutions of [Pt(R₃P)₂(SR’)₂] with sterically innocent thiolates to rearrange into a complex mixture of cis and trans complexes and polynuclear materials upon exposure to air, solutions of both 1 and 2 are stable with respect to isomerization and oligomerization. Crystal data for 1·2H₂O are monoclinic space group P2₁/c, Z = 4, R = 0.074 and for 2 they are monoclinic space group P2₁/n, Z = 4, R = 0.049..

Inorganica Chimica Acta 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, COA of Formula: C15H24S.

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

Tanwar, Lalita published the artcileSynthesis of Benzylic Alcohols by C-H Oxidation, Category: catalysis-chemistry, the publication is Journal of the American Chemical Society (2019), 141(45), 17983-17988, database is CAplus and MEDLINE.

Selective methylene C-H oxidation for the synthesis of alcs. with a broad scope and functional group tolerance is challenging due to the high proclivity for further oxidation of alcs. to ketones. Here, authors report the selective synthesis of benzylic alcs. employing bis(methanesulfonyl) peroxide as an oxidant. Authors attempt to provide a rationale for the selectivity for monooxygenation, which is distinct from previous work; a proton-coupled electron transfer mechanism (PCET) may account for the difference in reactivity. Authors envision that our method will be useful for applications in the discovery of drugs and agrochems.

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 C4H5NS2, Category: catalysis-chemistry.

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