Tag: M.W=200-250

Hunter, Luke published the artcileSynthesis of the ¦Â-hydroxydopa-¦Ã-hydroxy-¦Ä-sulfinylnorvaline component of ustiloxins A and B, Computed Properties of 77189-99-2, the publication is Organic & Biomolecular Chemistry (2005), 3(5), 732-734, database is CAplus and MEDLINE.

The ustiloxins are family of cyclic peptides isolated from fungus Ustilaginoidea virens. The dopa-sulfinylnorvaline component of ustiloxins A and B (I, BOC = tert-butoxycarbonyl) has been prepared using an Evans salen-Al-catalyzed aldol reaction of an oxazole derivative with a 6-mercaptoisovanillin derivative to generate the ¦Â-hydroxydopa portion (aldol adduct II), followed by substitution of bromolactone with the thiophenolate generated sulfide and asym. oxidation of the resulting sulfide to give the corresponding sulfoxide.

Organic & Biomolecular Chemistry published new progress about 77189-99-2. 77189-99-2 belongs to catalysis-chemistry, auxiliary class Thiophenol,Benzene,Ether, name is 2,4,6-Trimethoxybenzenethiol, and the molecular formula is C9H12O3S, Computed Properties of 77189-99-2.

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

Nguyen, Suong T. published the artcileDepolymerization of Hydroxylated Polymers via Light-Driven C-C Bond Cleavage, Formula: C15H24S, the publication is Journal of the American Chemical Society (2021), 143(31), 12268-12277, database is CAplus and MEDLINE.

The accumulation of persistent plastic waste in the environment is widely recognized as an ecol. crisis. New chem. technologies are necessary both to recycle existing plastic waste streams into high-value chem. feedstocks and to develop next-generation materials that are degradable by design. Here, we report a catalytic methodol. for the depolymerization of a com. phenoxy resin and high mol. weight hydroxylated polyolefin derivatives upon visible light irradiation near ambient temperature Proton-coupled electron transfer (PCET) activation of hydroxyl groups periodically spaced along the polymer backbone furnishes reactive alkoxy radicals that promote chain fragmentation through C-C bond ¦Â-scission. The depolymerization produces well-defined and isolable product mixtures that are readily diversified to polycondensation monomers. In addition to controlling depolymerization, the hydroxyl group modulates the thermomech. properties of these polyolefin derivatives, yielding materials with diverse properties. These results demonstrate a new approach to polymer recycling based on light-driven C-C bond cleavage that has the potential to establish new links within a circular polymer economy and influence the development of new degradable-by-design polyolefin materials.

Journal of the American Chemical Society 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, Formula: C15H24S.

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

Fujiwara, Masazumi published the artcileDetermination of the d-tensor components of a single crystal of N-benzyl-2-methyl-4-nitroaniline, Category: catalysis-chemistry, the publication is Japanese Journal of Applied Physics, Part 1: Regular Papers, Brief Communications & Review Papers (2007), 46(4A), 1528-1530, database is CAplus.

Linear and 2nd-order nonlinear optical (NLO) properties of a single crystal of N-benzyl-2-methyl-4-nitroaniline (BNA) were determined The refractive indexes of the crystal were measured in the visible to near IR region. The Marker-fringe and phase-matching methods were used to determine the magnitudes of the d-tensor components for the 2nd harmonic generation when excited the crystals at 1064 nm. They were d₃₃₃ = 234 ¡À 31, d₃₂₂ = 15.6 ¡À 0.9, and d₃₁₁ ? 0 pm/V. The value of d₃₃₃ is the largest value reported for any yellow-colored NLO materials and suggests that crystals of BNA will be very effective for terahertz wave generation.

Japanese Journal of Applied Physics, Part 1: Regular Papers, Brief Communications & 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, Category: catalysis-chemistry.

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

Casellas, Helene published the artcileCrystallographic evidence of theoretically novel anion-¦Ð interactions, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, the publication is New Journal of Chemistry (2006), 30(11), 1561-1566, database is CAplus.

The reaction of Cu(NO₃)₂¡¤3H₂O with the multidentate ligand N,N’,N”,N”’-tetrakis{2,4-bis(di-2-pyridylamino)-1,3,5-triazin-6-yl}triethylenetetramine (dpatta) in acetonitrile at high temperature and pressure gave the tetranuclear coordination compound [Cu₄(dpatta)(NO₃)₄](NO₃)₄¡¤12H₂O (1), whose crystal structure exhibits remarkable anion-¦Ð interactions which were calculated, considering the unexpected position of the anion toward the aromatic ring.

New Journal of 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, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride.

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

Tandiary, Michael Andreas published the artcileDeoxygenation of tertiary and secondary benzylic alcohols into alkanes with triethylsilane catalyzed by solid acid tin(IV) ion-exchanged montmorillonite, Application In Synthesis of 457-68-1, the publication is Tetrahedron Letters (2014), 55(30), 4160-4162, database is CAplus.

We discovered an efficient protocol for the conversion of tertiary and secondary benzylic alcs. into the corresponding alkanes in good to quant. yields by employing tin(IV) ion-exchanged montmorillonite (Sn-Mont) as a solid acid catalyst and Et₃SiH as the hydride source. The reaction is likely to proceed via the S_N1-type reaction mechanism, i.e., the formation of carbenium ions, followed by the addition of a hydride from the silane. The work-up of the reaction only requires simple filtration of the solid acid without any neutralization of the acid catalyst.

Tetrahedron Letters 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 C7H12ClNO, Application In Synthesis of 457-68-1.

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

Van Goethem, Sebastiaan published the artcileStructure-activity relationship studies on isoindoline inhibitors of dipeptidyl peptidases 8 and 9 (DPP8, DPP9): is DPP8-selectivity an attainable goal?, Quality Control of 457-68-1, the publication is Journal of Medicinal Chemistry (2011), 54(16), 5737-5746, database is CAplus and MEDLINE.

This work represents the first directed study to identify modification points in the topol. of a representative DPP8/9-inhibitor, capable of rendering selectivity for DPP8 over DPP9. The availability of a DPP8-selective compound would be highly instrumental for studying and untwining the biol. roles of DPP8 and DPP9 and for the disambiguation of biol. effects of nonselective DPP-inhibitors that have mainly been ascribed to blocking of DPPIV’s action. The cell-permeable DPP8/9-inhibitor 7 was selected as a lead and dissected into several substructures that were modified sep. for evaluating their potential to contribute to selectivity. The obtained results, together with earlier work from our group, clearly narrow down the most probable DPP8-selectivity imparting modification points in DPP8/9 inhibitors to parts of space that are topol. equivalent to the piperazine ring system in 7. This information can be considered of high value for future design of compounds with maximal DPP8 selectivity.

Journal of Medicinal 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 C18H35NO, Quality Control of 457-68-1.

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

Rajesh published the artcileMonomeric Cu(II) complexes with tetradentate bis(benzimidazole) ligand; synthesis, EPR, spectral and electrochemical studies, Category: catalysis-chemistry, the publication is Polyhedron (1998), 17(16), 2607-2615, database is CAplus.

1:1 Copper(II) complexes Cu(L)X₂¡¤nH₂O (X = Cl^–, NO₃^–, OAc^– and HCOO^–) with the tetradentate ligand 1,2-bis(2-benzimidazolylmethoxy)benzene (L) were prepared X-band EPR spectra of the above complexes examined as a frozen DMSO/DMF solution indicate g_¡¬ > g_¡Í > 2.0 and show four or less than four g_¡¬ lines and a broadening of the g_¡Í component suggesting a lowered site symmetry for the copper(II) ion. The g_¡Í component of all the complexes show nitrogen superhyperfine structure. A clear five line pattern is found in the g_¡Í region with B_N ? 15G¡À1 for Cu(L)X₂¡¤nH₂O complexes indicating that two nitrogen from the benzimidazole ring are coordinated to the central Cu^II in the equatorial basal plane while the other two positions in the sphere are occupied by the anionic ligand (X). With ClO₄^– as the anion, the 1:2 complex [Cu(L)₂](ClO₄)₂ results. The X-band EPR spectra of [Cu(L)₂](ClO₄)₂ shows a clear nine line SHF structure on the g_¡Í component indicating the presence of four nitrogen atoms coordinated to the central Cu^II atom; this confirms the retention of two ligands around Cu^II in solution MO coefficients ¦Â₁ and ¦Â₁‘ were evaluated from the expression used by Manoharan and Rogers. The trends of ¦Â₁ and ¦Â₁‘ indicate increasing electron delocalization on nitrogen atom as the authors change the exogenous ligand from formate/acetate-chloride to nitrate. The covalency parameter, ¦Á², also was evaluated and reflects the decreasing trend of covalency in the order nitrate > chloride ¡Ý acetate > formate for complexes containing these ligands. This trend of order is in conformity with that obtained from MO coefficients All the complexes exhibit a visible band with ¦Ë_max in the 625-690 nm region in DMF, suggesting a distorted geometry for copper(II) ion in the present series of complexes. Cyclic voltammetric studies of copper(II) complexes reveal that the E_1/2 for the Cu^II/Cu^I couple shifts to most neg. value with HCOO^– and OAc^– anionic ligands implying that these anion stabilize the Cu^II state whereas E_1/2 data for NO₃^– reveals that this anion destabilizes the Cu^II state. A plot of visible band energy vs. E_1/2 shows that as the energy of the d_x2-y2 orbital decreases, an anodic shift in Cu^II ¡ú Cu^I reduction potential is observed

Polyhedron 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 C10H10O6, Category: catalysis-chemistry.

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

Rajesh, Mathur published the artcileMonomeric Nickel(II) Complexes with Tetradentate Bis(benzimidazole) Ligands; Synthesis, Spectral and ¹H and ¹³C NMR Studies, SDS of cas: 5411-14-3, the publication is Journal of Chemical Research, Synopses (1998), 506-507, 2062-2078, database is CAplus.

The tetradentate ligand 1,2-bis(2-benzimidazolyloxamethyl)benzene (BBB) was used to synthesize complexes [Ni(BBB)X₂] where X = Cl, NCS, NO₃ or OAc; ¹H and ¹³C NMR was used to assign the aliphatic and ring protons/carbons.

Journal of Chemical Research, Synopses 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 C10H10O6, SDS of cas: 5411-14-3.

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

Ito, Mikinao published the artcileSynthesis and reactions of mono- and dinuclear Ni(I) thiolate complexes, Name: 2,4,6-Triisopropylbenzenethiol, the publication is Inorganic Chemistry (2009), 48(5), 2215-2223, database is CAplus and MEDLINE.

Mononuclear and dinuclear nickel(I) thiolato-bridged complexes, [Ni(PPh₃)(¦Ì-SR)]₂ [1a,b, R = 2,4,6-triisopropylphenyl (Tip), 1-adamantyl (Ad)], [(DxpS)Ni(¦Ì-SDxp)Ni(PPh₃)] (2, Dxp = 2,2”,6,6”-tetramethyl-1,1′:3,1”-terphenyl-2′-yl), and [Ni(SDmp)(PPh₃)] (3, Dmp = 2,6-dimesitylphenyl), were prepared by reactions of a nickel(I) amide [Ni{N(SiMe₃)₂}(PPh₃)₂] with the corresponding thiols. The two nickel centers of 1a and 1b are equivalent, and are linked by two thiolato groups and a Ni-Ni bond, whereas the two inequivalent nickel centers of 2 are bridged by a SDxp thiolate, by ¦Ç²:¦Ç³-xylyl aromatic ring of the other SDxp ligand, and a Ni-Ni bond. A slightly bulkier m-terphenyl thiolate, ^–SDmp, prevents its nickel complex from forming a Ni-Ni bond, and the mononuclear nickel(I) center of 3 is bound to PPh₃ and ^–SDmp through interactions with the sulfur and a ¦Ç²-mesityl. The coordinatively unsaturated nickel(I) complex 3 is reactive, and its reaction with TEMPO (2,2,6,6-tetramethylpiperidine N-oxyl) generated diamagnetic [Ni(SDmp)(PPh₃)(O,N:¦Ç²-TEMPO)] (4). N-Heterocyclic carbenes, 1,3,4,5-tetramethyl-2-imidazolinylidene (IMe’) and 1,3-dimesityl-2-imidazolinylidene (IMes), also react with 3 to afford a dinuclear nickel(I) complex, [Ni(IMe’)(¦Ì-SDmp)]₂ (5), and a mononuclear nickel(I) complex, [Ni(SDmp)(IMes)] (6), resp. Reaction of 3 with 1 equiv of ^tBuNC afforded the dinuclear complex [Ni(CN^tBu)(¦Ì-SDmp)]₂ (7), whereas the analogous reaction with 1 equiv of CO resulted in a mixture of [Ni(PPh₃)₂(CO)₂] and [Ni(CO)(SDmp)₂(PPh₃)] (8).

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, Name: 2,4,6-Triisopropylbenzenethiol.

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

Gu, Feng published the artcileRecovery of yttrium aluminum garnet from rock powder by flotation method, HPLC of Formula: 2016-56-0, the publication is Shigen to Sozai (1992), 108(10), 713-17, database is CAplus.

YAG (Y-Al garnet) dust was recovered from the rock powder containing green carborundum (GC) by flotation process using dodecyl ammonium acetate (DAA) as a cationic collector, or Aero Promoter 845# (Mitsue Cyanamide Co.) as an anionic collector. A 5-g powder mixture (YAG(sp. surface area 2.20 m²/g)/GC(0.59 m²/g) = 1/4) was studied using a 200 cm³ Denver flotation tester under the routine operating conditions described previously (CF: F.Gu, I. Matsuoka, and M. Mamiya 1991). Influences of collector, acid (activator, pH), and depressor concentrations on zeta potentials and flotation recoveries of YAG and GC are presented and discussed. About 90% recovery of YAG can be obtained by 3 ¡Á 10^-4 mol/dm³ concentration of DAA, 20 mg/dm³ corn starch as a depressor for GC, and 10^-1 mol/dm³ H₂SO₄ or H₂C₂O₄ as an activator. The oxalic acid is favorable with respect to high-grade flux. The AP845# was absorbed preferentially on the YAG surface, and can be used as an effective collector at 1.5 ¡Á 10^-5 mol/dm³ and pH 1.5 ? 2.5, and 90% recovery was attained by 5 mg/dm³ corn starch and 4 mg/dm³ ¦Á-terpinol.

Shigen to Sozai 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, HPLC of Formula: 2016-56-0.

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