Tag: M.W=200-250

Lu, Kui published the artcileDevelopment of a Concise and Diversity-Oriented Approach for the Synthesis of Plecomacrolides via the Diene-Ene RCM, Recommanded Product: Allyldiphenylphosphine oxide, the publication is Organic Letters (2006), 8(6), 1193-1196, database is CAplus and MEDLINE.

A concise synthesis of the core structures of plecomacrolide with ring sizes varying from 16 to 19 atoms was achieved for the first time by the diene-ene ring-closing olefin metathesis reaction. This approach should allow access to the structurally diverse analogs of plecomacrolide.

Organic 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, Recommanded Product: Allyldiphenylphosphine oxide.

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

Christiaens, Mien published the artcileStereoselective and Modular Assembly Method for Heterocycle-Fused Daucane Sesquiterpenoids, Formula: C15H15OP, the publication is Chemistry – A European Journal (2018), 24(52), 13783-13787, database is CAplus and MEDLINE.

A stereoselective synthetic method is reported for the mol. framework found in common daucane and isodaucane sesquiterpenoid natural products. The synthetic method constitutes a scalable, modular, and also asym. access to a complex natural product scaffold, wherein the substitution pattern and the stereochem. can be adjusted simply by choosing different starting materials. The method allows the rapid introduction of diverse heterocyclic substructures such as (benzo)furans, (benzo)thiophenes, dithiins, thiazoles, and indoles, which actually also facilitate and direct the key intramol. annulation step.

Chemistry – A European Journal 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, Formula: C15H15OP.

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

May, E. M. published the artcileA normal-phase high-performance liquid-chromatographic assay for aziridine residue in trientine dihydrochloride, Recommanded Product: N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, the publication is Journal of Pharmaceutical and Biomedical Analysis (1987), 5(1), 65-70, database is CAplus and MEDLINE.

The aziridine??[151-56-4] residue in trientine (I) [112-24-3] (com. product), purified compound, and in I-HCl [38260-01-4] was determined by an indirect HPLC method on a LiChrosorb column (5-¦Ìm) with CH₂Cl₂-iso-PrOH (98.5:1.5) and UV detector at 260 and 410 nm. The compound was treated with Folin’s reagent in pH 11.9 phosphate buffer and the complex was chromatographed. The detection limit was 0.05 ppm. Seven com. samples of trientine were examined for the presence of aziridine by the above method, and no aziridine was detected in any of the samples. The method is applicable for basic drugs in general.

Journal of Pharmaceutical and Biomedical Analysis 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

Zhang, Kai published the artcileEfficient and Reversible Absorption of CO₂ by Functional Deep Eutectic Solvents, Formula: C6H20Cl2N4, the publication is Energy & Fuels (2018), 32(7), 7727-7733, database is CAplus.

Extremely low-volatility functional deep eutectic solvents (DESs), based on ethylene glycol (EG) and diethylene glycol (DG) as hydrogen-bond donor and the ammonium salts obtained from triethylenetetramine (TETA) and HCl at different mole ratios as hydrogen-bond acceptor, were designed and used to capture CO₂. All of the designed DESs can efficiently capture CO₂ even at low partial pressures. CO₂ absorption capacity of [TETA]Cl-EG DES with n_[TETA]Cl/n_EG 1:3 is high up to 17.5 wt % (1.456 mol CO₂/mol [TETA]Cl) at 40 ¡ãC and 1 atm. CO₂ absorption capacity decreases with increasing temperature and decreasing CO₂ partial pressure. Regeneration experiments show that CO₂ absorption capacities in [TETA]Cl-EG DES and [TETA]Cl-DG DES do not vary after five absorption/desorption cycles. It is found that EG or DG can increase the absorption capacity via activating -NH- or -NH₂ on [TETA]Cl and enhance the basicity of DESs. In addition, CO₂ absorption mechanism in [TETA]Cl-EG DES based on the change of its viscosity during absorption and FTIR anal. indicates that there is a chem. interaction between CO₂ and [TETA]Cl, and the stoichiometry for the reversible absorption is 1.5 mols. of CO₂ per [TETA]Cl-EG DES mol.

Energy & Fuels 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 C20H19NO4, Formula: C6H20Cl2N4.

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

Lee, Kang-sang published the artcileMonodentate Non-C₂-symmetric Chiral N-Heterocyclic Carbene Complexes for Enantioselective Synthesis. Cu-Catalyzed Conjugate Additions of Aryl- and Alkenylsilylfluorides to Cyclic Enones, Recommanded Product: Difluorodiphenylsilane, the publication is Journal of Organic Chemistry (2009), 74(12), 4455-4462, database is CAplus and MEDLINE.

A new class of enantioselective conjugate addition (ECA) reactions that involve aryl- or alkenylsilyl fluoride reagents and are catalyzed by chiral non-C₂-sym. Cu-based N-heterocyclic carbene (NHC) complexes are disclosed. Transformations were designed based on the principle that a catalytically active chiral NHC-Cu-aryl or NHC-Cu-alkenyl complex can be accessed from reaction of a Cu-halide precursor with in situ-generated aryl- or alkenyltetrafluorosilicate. Reactions proceed in the presence of 1.5 equiv of the aryl- or alkenylsilane reagents and 1.5 equiv of tris(dimethylamino)sulfonium difluorotrimethylsilicate (TASF). Desired products are isolated in 63-97% yield and 73.5:26.5-98.5:1.5 enantiomeric ratio (47%-97% ee). A major focus of the present studies is the design, evaluation, and development of new chiral imidazolinium salts and their derived NHC-Cu complexes as catalysts that promote reactions of various carbosilanes to a range of electrophilic substrates. Toward this end, nearly 20 new chiral monodentate imidazolinium salts, most of which are non-C₂-sym., were prepared and fully characterized and their ability to serve as catalysts in the ECA reactions was studied.

Journal of Organic 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, Recommanded Product: Difluorodiphenylsilane.

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

Boethling, Robert S. published the artcileDoes the semi-continuous activated sludge (SCAS) test predict removal in secondary treatment?, Recommanded Product: Dodecylamineacetate, the publication is Chemosphere (1997), 35(10), 2119-2130, database is CAplus.

The SCAS test was formalized by the US Soap and Detergent Association in 1965. The SCAS procedure has also been adopted by the Organization for Economic Cooperation and Development as a test for inherent biodegradability and by the US EPA as a test guideline (40CFR 835.3120) under the Toxic Substances Control Act. To study whether the SCAS test may be used to predict removal in full-scale activated sludge treatment systems, we collected all available SCAS data for organic chems., and retrieved data from full-, pilot- or bench-scale continuous-feed activated sludge studies for the chems. that had SCAS data. The intersected file was subjected to statistical anal. Conclusions are: (1) SCAS data were strongly clustered at high (>90%) removal; (2) for SCAS removal >90%, it is probable that removal in the field will be >50%; (3) however, for SCAS removal <90% adequate treatability cannot be predicted with confidence.

Chemosphere 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, Recommanded Product: Dodecylamineacetate.

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

Chao, Chen-Shen published the artcileStudies on fabric dye additives – dye additives for polyacrylic fibers, COA of Formula: C14H31NO2, the publication is Yingyong Jiemian Huaxue (1979), 2-8, database is CAplus.

In the dyeing of polyacrylonitrile fibers with Astrazon Yellow 3 GL, Astrazon Red GTL, and Astrazon Blue FRR in the presence of 21 cationic surfactants, 15 anionic surfactants, and 26 nonionic surfactants, alkylbenzyldimethylammonium chlorides, alkyltrimethylammonium chlorides, and alkylhydroxyimidazolines gave good results. Dyeing was improved by mixing the above cationic surfactants with C₁₆H₃₃(OCH₂CH₂)_nOH [9004-95-9], C₁₇H₃₅CO(OCH₂CH₂)_nOH [9004-99-3], or similar nonionic surfactants.

Yingyong Jiemian Huaxue 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

Dilworth, Jonathan R. published the artcileSyntheses and structures of [Re(SC₆H₃Me₂-2,6)₃(PPh₃)], [Re(SC₆H₃Me₂-2,6)₃(Bu^tNC)₂], [Re(SC₆H₂Prⁱ₃-2,4,6)₃L(PPh₃)] (L = N₂ or CO) and [ReH₄(PPh₃)₄][ReO(SC₆H₂Prⁱ₃-2,4,6)₄], Quality Control of 22693-41-0, the publication is Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1995), 3153-64, database is CAplus.

The hydride [ReH₇(PPh₃)₂] reacted with 2,6-dimethylbenzenethiol in toluene to give [Re(SC₆H₃Me₂-2,6)₃(PPh₃)] (1). A crystal structure showed a trigonal-bipyramidal geometry about the Re with an agostic interaction to a thiolate Me occupying an apical site, trans to the PPh₃ ligand. 1 Reacts rapidly with MeCN to give the known [Re(SC₆H₃Me₂-2,6)₃(MeCN)(PPh₃)] (2) and with Bu^tNC to form [Re(SC₆H₃Me₂-2,6)₃(Bu^tNC)₂] (3). The crystal structure of 3 showed trigonal-pyramidal geometry about the Re with asym. coordination of the isocyanide ligands and an unusual configuration for the thiolate aromatic groups. The reactions of the hydrides [ReH₇(PPh₃)₂] and [ReH₅(PPh₃)₃] with 2,4,6-triisopropyl-, 2,6-dimethoxybenzenethiol and tris(2-sulfanylphenyl)phosphine were also studied. With HSC₆H₂Prⁱ₃-2,4,6, [Re(SC₆H₂Prⁱ₃-2,4,6)₃(N₂)(PPh₃)] (4) was formed and its structure determined The preparations and structures of [ReH₄(PPh₃)₄][ReO(SC₆H₂Prⁱ₃-2,4,6)₄], [Re{SC₆H₃(OMe)₂-2,6}₃(PPh₃)] and [Re{P(C₆H₄S-2)₃}(PPh₃)] are also discussed. An alternative convenient route to [ReH₄(PPh₃)₄]⁺ from [ReH₅(PPh₃)₃] is presented.

Journal of the Chemical Society, Dalton Transactions: 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, Quality Control of 22693-41-0.

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

Zhang, Jian-Feng published the artcileDetermination and quantum chemical calculation of the acid dissociation constants of some phenoxy acetic acids, SDS of cas: 5411-14-3, the publication is Yingyong Huaxue (2004), 21(8), 766-769, database is CAplus.

The acid dissociation constants of seven phenoxy acetic acids were determined by potentiometric titration It has been shown that phenoxy acetic acids exhibit stronger acidity than both acetic acid and benzoic acid due to the induction and conjugation of the oxygen atom on -OCH₂COOH that links to the benzene ring. Acidity of phenoxy acetic acids containing two or more -OCH₂ COOH groups is lower than that of phenoxy acetic acid by reason of electron donation of oxygen atom to the benzene ring. Quantum chem. calculation of the phenoxy acetic acids was carried out using CNDO/2 method. The bond charge d.(¦Ñ) of 0-H and C-O bond in carboxyl group of seven phenoxy acetic acids was calculated, and the value f=¦Ñ_O-H/¦Ñ_C-C, was figured out. The f value of the carboxyl group in phenoxy acetic acid as well as the f values of the most likely dissociated carboxyl group in other six phenoxyl acetic acid derivatives are changed in the corresponding change order of their pK_a or pK_a1 values. It is concluded that the f value can be used as a judgement criterion of relative acidity for phenoxy acetic acids.

Yingyong Huaxue 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 C6H8O3, SDS of cas: 5411-14-3.

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

Zhang, Jian-feng published the artcileFlotation depression of calcite by phenoxy carboxylic acid, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Zhongnan Gongye Daxue Xuebao, Ziran Kexueban (2001), 32(2), 146-149, database is CAplus.

A new type of flotation reagents, phenoxy-containing (acetic acid compounds), were prepared by treating phenol or a polyphenol, such as dihydroxybenzene and v-trihydroxybenzene, with chloroacetic acid in an alkali solution Controlling the reaction pH value and developing a new self-sealing method brought about a good synthesizing result with high yield and selectivity. It has been shown that the synthesized chems., especially the product of pyrogallol and gallic acid reacting with chloride acetic acid, act as effective depressants in the flotation of calcite. When sodium oleate with 1 x 10^-4 mol/L is used as a collector, calcite can be completely depressed when the concentration of two chems. is 4 x 10^-5 mol/L and 5 x 10^-5 mol/L at pH value 8.78 and 8.47, resp. The electronegativity of group, reagent specific exponent and HLB are discussed, which have explained the depressing mechanism and structure-property relationship of the synthesized chems.

Zhongnan Gongye Daxue Xuebao, Ziran Kexueban 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 C9H12O3S, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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