Tag: M.W=200-250

Stephens, David E. published the artcileSynthetic and mechanistic aspects of the regioselective base-mediated reaction of perfluoroalkyl- and perfluoroarylsilanes with heterocyclic N-oxides, Safety of Trimethyl(perfluorophenyl)silane, the publication is Organic & Biomolecular Chemistry (2014), 12(32), 6190-6199, database is CAplus and MEDLINE.

The scope and mechanistic implications of the direct transformation of heterocyclic N-oxides to 2-trifluoromethyl-, and related perfluoroalkyl- and perfluoroaryl-substituted N-heterocycles has been studied. The reaction is effected by perfluoroalkyl- and perfluorophenyltrimethylsilane in the presence of strong base. In situ displacement of the para-fluoro substituent in the pentafluorophenyl ring and the methoxy group in 8-methoxyquinolines with addnl. nucleophiles allows for further site-selective refunctionalization of the N-heterocyclic products.

Organic & Biomolecular Chemistry 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 C15H10O2, Safety of Trimethyl(perfluorophenyl)silane.

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

Chao, Chen-Shen published the artcileStudy on the dyeing auxiliaries of textiles: dyeing auxiliaries of polyamide fibers, Recommanded Product: Dodecylamineacetate, the publication is Yingyong Jiemian Huaxue (1979), 11-22, database is CAplus.

Polyamide fibers were dyed with acid dyes such as Suminol Yellow NR, Formonol Yellow 5GN, etc., in the presence of Na lauryl sulfate [151-21-3], sorbitan monolaurate [1338-39-2], or a similar surfactant, which improved the leveling of the dyeing. Pretreated acid dyes indicated selectivity to the surfactants. The cationic surfactants were not suitable to the pretreated acid dyes, but mixtures of anionic and cationic surfactants were useful. Most of the acid dyes reacted with the polyamide fibers, so the color absorbability was good but lacked regularity.

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, Recommanded Product: Dodecylamineacetate.

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

Chen, Wei published the artcileSnapshotting the Excited-State Planarization of Chemically Locked N,N’-Disubstituted Dihydrodibenzo[a,c]phenazines, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Journal of the American Chemical Society (2017), 139(4), 1636-1644, database is CAplus and MEDLINE.

For deeper understanding of the coupling of electronic processes with conformational motions, we exploit a tailored strategy to harness the excited-state planarization of N,N’-disubstituted dihydrodibenzo[a,c]phenazines by halting the structural evolution via a macrocyclization process. In this new approach, 9,14-diphenyl-9,14-dihydrodibenzo[a,c]phenazine (DPAC) is used as a prototype, in which the para sites of 9,14-diphenyl are systematically enclosed by a dialkoxybenzene-alkyl-ester or -ether linkage with different chain lengths, imposing various degrees of constraint to impede the structural deformation. Accordingly, a series of DPAC-n (n = 1-8) derivatives were synthesized, in which n correlates with the alkyl length, such that the strength of the spatial constraint decreases as n increases. The structures of DPAC-1, DPAC-3, DPAC-4, and DPAC-8 were identified by the X-ray crystal anal. As a result, despite nearly identical absorption spectra (onset ?400 nm) for DPAC-1-8, drastic chain-length dependent emission is observed, spanning from blue (n = 1, 2, ?400 nm) and blue-green (n = 3-5, 500-550 nm) to green-orange (n = 6) and red (n = 7, 8, ?610 nm) in various regular solvents. Comprehensive spectroscopic and dynamic studies, together with a computational approach, rationalized the associated excited-state structure responding to emission origin. Severing the linkage for DPAC-5 via lipase treatment releases the structural freedom and hence results in drastic changes of emission from blue-green (490 nm) to red (625 nm), showing the brightening prospect of these chem. locked DPAC-n in both fundamental studies and applications.

Journal of the American Chemical Society 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, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Li, Gang published the artcileDBU-Catalyzed Selective N-Methylation and N-Formylation of Amines with CO₂ and Polymethylhydrosiloxane, Product Details of C14H23N, the publication is Advanced Synthesis & Catalysis (2018), 360(12), 2364-2369, database is CAplus.

We describe herein an efficient organocatalytic system for the selective N-methylation and N-formylation of amines with carbon dioxide (CO₂) as a sustainable C1 feedstock and polymethylhydrosiloxane (PMHS) as a cost-effectvie reducing reagent. High-yielding N-methylation products are obtained with low catalyst loading (1%) of DBU. Selective N-formylation of amines is achieved using the same catalytic system at a lower reaction temperature

Advanced Synthesis & Catalysis 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, Product Details of C14H23N.

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

Swamy, K. C. Kumara published the artcilePentacoordinated molecules. 79. Pentacoordinate acyclic and cyclic anionic oxysilicates. A silicon-29 NMR and x-ray structural study, Recommanded Product: Difluorodiphenylsilane, the publication is Journal of the American Chemical Society (1990), 112(6), 2341-8, database is CAplus.

Variable temperature ²⁹Si NMR spectral measurements revealed the formation of acyclic anionic silicates, [R_n‘Si(OR)_5-n][K,18-crown-6], n = 0-3, from reactions of alkoxy and aryloxysilanes with the resp. potassium alkoxide or potassium aryloxide in the presence of 18-crown-6. This elusive class of substances has been proposed as model intermediates in the sol-gel process. In the case of [PhSi(OCH₂CF₃)₄][K,18-crown-6], isolation as a crystalline solid was achieved. The ²⁹Si chem. shifts move progressively downfield from Si(OR)₅^– to R’Si(OR)₄^– to R₂‘Si(OR)₃^–. Pentaalkoxysilicate anions react rapidly with pinacol to form the corresponding five-coordinated bicyclic anionic silicate. Independent synthesis and an x-ray structural study verified the formation of the bis(pinacolate) [(OCMe₂CMe₂O)₂SiOCHMe₂][K,18-crown-6] (I). For comparison of structural distortions, the synthetic and x-ray characterization of the related anionic oxysilicates [(C₆H₄(CF₃)₂CO)₂SiR][Et₄N] (II) and [(C₆H₄O₂)₂SiR][Me₂NH₂] (III) (R = cyclohexyl) are reported. The structures of I and II are trigonal-bipyramidal and that of III is rectangular-pyramidal.

Journal of the American Chemical Society 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 C9H9F5Si, Recommanded Product: Difluorodiphenylsilane.

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

Lin, Pei-Min published the artcileBimetallic Nickel Complexes that Bear Diamine-Bis(Benzotriazole Phenolate) Derivatives as Efficient Catalysts for the Copolymerization of Carbon Dioxide with Epoxides, Related Products of catalysis-chemistry, the publication is ChemCatChem (2016), 8(5), 984-991, database is CAplus.

We report the facile synthesis and structural characterization of efficient bimetallic nickel catalysts that bear diamine-bis(benzotriazole phenolate) derivatives for the copolymerization of CO₂ and epoxides. Thermally robust di-nickel 2 is an effective catalyst for the alternating copolymerization of cyclohexene oxide (CHO) with CO₂ to give turnover numbers of up to >4000 and turnover frequencies of up to >400 h^-1. Ni catalyst 2 leads to not only controlled CO₂/CHO coupling, but it has also been applied to catalyze the copolymerization of 4-vinyl-1,2-cyclohexene oxide (VCHO) and CO₂ to obtain the corresponding polycarbonate with the vinyl functionality on the side chains. This is the first example of a dinuclear Ni complex that is efficient for both CO₂/VCHO copolymerization and the formation of a high-mol.-weight copolymer with a large amount of carbonate linkages.

ChemCatChem published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Related Products of catalysis-chemistry.

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

Leung, Joe C. T. published the artcilePhoto-fluorodecarboxylation of 2-Aryloxy and 2-Aryl Carboxylic Acids, Category: catalysis-chemistry, the publication is Angewandte Chemie, International Edition (2012), 51(43), 10804-10807, database is CAplus and MEDLINE.

Transition-metal-free photo-fluorodecarboxylation of 2-aryloxy- and 2-arylacetic acids was accomplished via use of Selectfluor. E.g.., irradiation of an aqueous alk. solution of 4-FC₆H₄OCH₂CO₂H at 300 nm for 1 h in presence of Selectfluor gave up to 94% of the monofluoromethyl ether 4-FC₆H₄OCH₂F. Also prepared were difluoromethyl ethers.

Angewandte Chemie, International Edition 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, Category: catalysis-chemistry.

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

Toste, F. Dean published the artcileFunctional group diversity by ruthenium-catalyzed olefin cross-metathesis, Application of Allyldiphenylphosphine oxide, the publication is Pure and Applied Chemistry (2002), 74(1), 7-10, database is CAplus.

Ruthenium-catalyzed olefin cross-metathesis tolerates a wide range of functional groups, including phosphine-boranes, sulfides, amines, phenols, and oxazolines. The catalyst discussed here was [1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium. The high functional group tolerance allows for the use of an olefin as a linchpin for the synthesis of a variety of bi-, tri-, and tetradentate chiral ligands with a high degree of functional group diversity. A lecture presented at the 11th annual IUPAC International Symposium on Organometallic Chem. Directed Toward Organic Synthesis (OMCOS-11), Taipei, Taiwan July 22-26, 2001.

Pure and Applied Chemistry 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 C10H11NO4, Application of Allyldiphenylphosphine oxide.

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

Brogan, Samantha published the artcileCopper-bisphosphine-initiated pentafluorophenylation of aldehydes and ketones, COA of Formula: C9H9F5Si, the publication is Synlett (2010), 615-617, database is CAplus.

In the presence of substoichiometric quantities of a copper-bisphosphine complex, a variety of aldehydes and reactive ketones undergo pentafluorophenylation to provide corresponding pentafluorophenylmethanols by using pentafluorophenyltrimethylsilane.

Synlett 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, COA of Formula: C9H9F5Si.

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

Hill, Robert A. published the artcileBiosynthesis of fungal metabolites. Terrein, a metabolite of Aspergillus terreus Thom, SDS of cas: 1860-58-8, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1981), 2570-6, database is CAplus.

Terrein (I), a metabolite of A. terreus, was shown by incorporation experiments with labeled precursors to be biosynthesized from 3,4-dihydro-6,8-dihydroxy-3-methylisocoumarin (II) by contraction of an aryl ring. The direction of the ring contraction was studied with acetate-1,2–¹³C₂ as precursor.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, SDS of cas: 1860-58-8.

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