Tag: M.W=200-250

Zemtsov, Artem A. published the artcileReaction of Baylis-Hillman Adducts with Fluorinated Silanes, Application of Trimethyl(perfluorophenyl)silane, the publication is European Journal of Organic Chemistry (2010), 6779-6785, S6779/1-S6779/7, database is CAplus.

Reactions of acylated Baylis-Hillman adducts bearing nitrile, ester, or ketone groups with C₆F₅-substituted silicon reagents Me_nSi(C₆F₅)_4-n (n = 1-3) have been studied. The reactions are initiated by Bu₄NOAc (5 mol-%) in MeCN or DMF under mild conditions and afford products of allylic substitution of the acetoxy group by the C₆F₅ carbanion in good yields. Predominant or exclusive formation of one geometrical isomer was observed in all cases (Z for nitriles, E for esters and ketones). For substrates containing carbonyl groups, nucleophilic attack of the C₆F₅ carbanion chemoselectively occurred at the C=C bond. Reactions of acylated Baylis-Hillman adducts with Me₃SiCF₃ were found to be inefficient, as the CF₃ carbanion had the propensity to attack the C=O bond of substrates with ester or ketone substituents.

European Journal of Organic 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 C14H28O5S, Application of Trimethyl(perfluorophenyl)silane.

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

Zemtsov, Artem A. published the artcileReactions of fluorinated silanes with 2-nitrocinnamates, Recommanded Product: Trimethyl(perfluorophenyl)silane, the publication is Journal of Fluorine Chemistry (2011), 132(6), 378-381, database is CAplus.

The interaction of ¦Á-nitrocinnamates with Me₃SiR_f (R_f = CF₃, C₂F₅, C₆F₅) promoted by NaOAc in DMF or by Bu₄NOAc in CH₂Cl₂ was described. The reactions proceeded as conjugate addition of the resp. fluorinated carbanion at the C:C bond and afforded 3-aryl-2-nitrobutanoic acid Me esters (aryl = Ph, 4-MeOC₆H₄, 2-furyl) bearing a fluorinated substituent in good yields as diastereomeric mixtures in ratios of 1:1 to 1.6:1. Subsequent hydrogenation led to amino acid esters.

Journal of Fluorine 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 C9H9NO6S, Recommanded Product: Trimethyl(perfluorophenyl)silane.

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

Koritzer, Richard T. published the artcileEnhanced fluoride penetration and retention in enamel, Product Details of C12H10F2Si, the publication is Caries Research (1979), 13(5), 259-64, database is CAplus and MEDLINE.

Fluorosilanes enhanced the retention and improved the penetration of fluoride into enamel in vitro. The efficacy of this treatment seemed to lie in its ability to utilize the enamel organic network as a conduit to increase the enamel prism surface area accessible to reaction with fluoride. Thus, silanes may be effective as a vehicle to transport fluoride via the organic network to loci best suited for therapeutic effectiveness.

Caries Research 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, Product Details of C12H10F2Si.

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

Frohn, H.-J. published the artcileReactions of methyl(pentafluorophenyl)- and methyl(pentafluorophenyl)phenylsilanes with electrophiles. A convenient preparative route to halo(methyl)pentafluorophenylsilanes C₆F₅SiMe₂X and C₆F₅SiMeX₂ (X = F, Cl and Br), Application In Synthesis of 1206-46-8, the publication is Journal of Organometallic Chemistry (1998), 570(2), 255-263, database is CAplus.

Halo(methyl)pentafluorophenylsilanes C₆F₅SiMe_nX_3-n (n = 1, 2) (X = F, Cl, Br) were prepared in good yields from the corresponding phenylsilanes C₆F₅SiMe_nPh_3-n by reactions with the electrophiles anhydrous HF, HCl-AlCl₃, Br₂-AlBr₃ or AlX₃ (X = Cl, Br) in halogenated hydrocarbons. Addnl., reactions of C₆F₅SiMe₃ and (C₆F₅)₂SiMe₂ with selected electrophiles were studied.

Journal of Organometallic 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 C9H9F5Si, Application In Synthesis of 1206-46-8.

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

Thorburn Burns, D. published the artcileSystematic approach to the identification of water-gel explosives, Recommanded Product: Dodecylamineacetate, the publication is Analytica Chimica Acta (1998), 375(3), 255-260, database is CAplus.

Anal. procedures are described for qual. and quant. characterization of water-gel (slurry) explosives by way of identification of major constituents (i.e., Al, Na⁺, Ca²⁺, NH₄⁺, CH₃NH₃⁺, NO₃^–, laurylamine acetate), using gravimetry (for Al), reversed-phase liquid chromatog. after benzoyl chloride derivatization (for ethylene glycol), ion chromatog. with cation and anion anal. (for inorganic materials), and electrospray mass spectrometry for detection of laurylamine acetate. Three explosive samples of similar composition were discriminated using this systematic approach.

Analytica Chimica Acta 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 C9H7NO2, Recommanded Product: Dodecylamineacetate.

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

Liu, Zheng-Tang published the artcileTitanium, aluminum and zinc complexes containing diamine-bis(benzotriazole phenolate) ligands: Synthesis, structural characterization and catalytic studies for ring-opening polymerization of ¦Å-caprolactone, Synthetic Route of 140-28-3, the publication is Journal of Molecular Structure (2017), 395-403, database is CAplus.

Structurally diverse metal complexes bearing diamine-bis(benzotriazole phenolate) (DiBTP) ligands were synthesized and fully characterized by single crystal x-ray crystallog. The reaction of Ti(OⁱPr)₄ with ^C8MEADiBTP-H₂ or ^C8BEADiBTP-H₂ (1.0 mol equivalent) generated the monomeric Ti alkoxy complexes [(^C8MEADiBTP)Ti(OⁱPr)₂] (1) and [(^C8BEADiBTP)Ti(OⁱPr)₂] (2), resp. Also, ^C8BEADiBTP-H₂ reacted with 2.0 molar equivalent of AlMe₃ to give the tetracoordinated di-Al complex [(^C8BEADiBTP)Al₂Me₄] (3). Zn complex [(^C8BEADiBTP)Zn₂Et₂] (4) could be obtained by the alkane elimination of ZnEt₂ (2.0 equiv) with ^C8BEADiBTP-H₂ as the pro-ligand under similar synthetic methods in good yield. Single-crystal x-ray diffraction indicates that 3 is a bimetallic Al di-Me complex with a tetradentate ^C8BEADiBTP moiety chelating two metal atoms, whereas complex 4 displays the dinuclear feature containing both tetra- and pentacoordinated Zn atoms bonded by one ONNON-pentadentate ^C8BEADiBTP ligand. Catalytic studies for ring-opening polymerization of ¦Å-caprolactone of complex 1–4 were systematic explored; the comparative studies of such polymerization are also discussed.

Journal of Molecular Structure 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, Synthetic Route of 140-28-3.

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

Pearson, Anthony J. published the artcileSome Studies on the Uses of 2-Bromoethyl and 2-Iodoethyl Ester Blocking Groups in Peptide Synthesis: Samarium Diiodide-Mediated Deprotection, Computed Properties of 1860-58-8, the publication is Journal of Organic Chemistry (1994), 59(8), 2257-60, database is CAplus.

Deprotection of 2-bromoethyl esters during peptide synthesis is often problematic, owing to competing formation of 2-hydroxyethyl esters. A simple and reproducible method is described for the removal of the 2-bromoethyl group via conversion to the corresponding 2-iodoethyl ester, followed by deprotection of the latter by treatment with samarium diiodide under anhydrous oxygen-free conditions. No racemization was observed for phenylglycine derivatives during the protection/halide exchange/deprotection sequence. Application of this methodol. to a number of peptides as well as simple carboxylate derivatives is described.

Journal of Organic Chemistry 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, Computed Properties of 1860-58-8.

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

Ohshita, Joji published the artcileSynthesis of Siloles Condensed with Benzothiophene and Indole Rings, Name: Difluorodiphenylsilane, the publication is Organometallics (2004), 23(23), 5622-5625, database is CAplus.

Compounds having a silole ring condensed with benzothiophene and N-methylindole units (BBTS and BMIS; shown as I and II) were prepared The electronic states of BBTS and BMIS were examined with respect to their UV and emission spectra and CV measurements, in comparison with those of bibenzothiophene and bi-N-methylindole, indicating that the existence of the silole ring in BBTS and BMIS affects the electronic states to decrease the HOMO-LUMO energy gaps. The results of MO calculations on model compounds agree well with the exptl. observations. The crystal and mol. structures of II were determined by x-ray crystallog. Electroluminescence devices based on I and II performed poorly.

Organometallics 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, Name: Difluorodiphenylsilane.

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

Zoh, Dyung Duk published the artcileCooperation of ¦Â-cyclodextrin with macrocyclic metal centers in the action of artificial metalloesterases built on poly(ethylenimine), Computed Properties of 1798-04-5, the publication is Bioorganic Chemistry (1994), 22(3), 242-52, database is CAplus.

¦Â-Cyclodextrin (CD) was attached to poly(ethylenimine) (PEI), and then macrocyclic metal centers were constructed on the polymer by condensation with glyoxal or butanedione in the presence of metal (Zn^II, Ni^II, or Co^II) templates. The resulting polymers were treated with acetic anhydride to block primary or secondary amines. Hydrolysis of 2 nitrophenyl esters containing t-butylphenyl residues in the acyl moieties was catalyzed by the PEI derivatives containing both CD cavities and macrocyclic metal centers. Anal. of the kinetic data indicated that the CD cavities and the metal centers provided binding sites and catalytic sites, resp., for the ester substrates, mimicking metalloesterases. Although the content of the metal center was much smaller for the Zn^II-containing artificial enzyme compared with the Ni^II and Co^II analogs, catalytic efficiency was greater for the Zn^II derivative Kinetic data indicate high reactivity of the metal center in the productive complex formed between the catalyst and the substrate, when the unproductive binding by the CD cavities is considered.

Bioorganic Chemistry 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 C5H10N2OS, Computed Properties of 1798-04-5.

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

Gortner, Willis A. published the artcileRelation of chemical structure to plant growth-regulator activity in the pineapple plant. V. Post-harvest delay of senescence of pineapple fruit, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Botanical Gazette (Chicago) (1969), 130(2), 87-97, database is CAplus.

The effects of 369 compounds, including 94 phenoxyacetic acids, 43 other phenoxy acids, 23 phenylacetic acids, 15 hydrocinnamic acids, 9 benzoic acids, 7 salicylic acids, 48 naphthalene derivatives, 22 indole acids, 5 hydrazine derivatives, and 8 cinnamic acids, for postharvest delay of senescence of pineapple fruit (Ananas comosus) were determined Seventy-six of the compounds were active, and 27 were highly active in delaying senescence. In the phenoxyacetic acid series, high activity was obtained from some halogen-substituted acids but not generally from Me-substituted acids. In the phenoxy-¦Á-propionic acid series, high activity was not observed for a number of halogen- and Me-substituted acids. None of the substituted phenoxy acids other than HOAc and ¦Á- propionic showed even moderate activity. An appreciable number of Cl-substituted phenylacetic acids and several benzoic acids showed activity. None of the phenylalkylcarboxylic acids other than HOAc showed even moderate activity. None of the salicylic acid, phthalic acids, or phthalamic acids showed any activity. All hydrazine derivatives were inactive.

Botanical Gazette (Chicago) 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, Name: 2-(4-(tert-Butyl)phenoxy)acetic acid.

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