Catalysis-chemistry

Singh, Govind P. published the artcileAchiral 2-Hydroxy Protecting Group for the Stereocontrolled Synthesis of 1,2-cis-¦Á-Glycosides by Six-Ring Neighboring Group Participation, Application of 2,4,6-Trimethoxybenzenethiol, the publication is Organic Letters (2015), 17(17), 4376-4379, database is CAplus and MEDLINE.

Glycosylation of a fully armed donor bearing a 2-O-(trimethoxybenzenethiol) Et ether protecting group is completely ¦Á-selective with a range of carbohydrate alc. acceptors. Low-temperature NMR studies confirm the intermediacy of cyclic sulfonium ion intermediates arising from six-membered ¦Â-sulfonium ring neighboring group participation. Selective protecting group removal is achieved in high yield in a single operation by S-methylation and base-induced ¦Â-elimination.

Organic Letters 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 C8H6ClN, Application of 2,4,6-Trimethoxybenzenethiol.

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

Jacquemin, Denis published the artcileAb initio investigation of the n ¡ú ¦Ð transitions in thiocarbonyl dyes, Quality Control of 6972-05-0, the publication is Journal of Physical Chemistry A (2006), 110(29), 9145-9152, database is CAplus and MEDLINE.

The n ¡ú ¦Ð* transitions in more than 100 thiocarbonyl dyes have been calculated with an ab initio procedure relying on the combination of time-dependent d. functional theory for evaluating excited states and the polarizable continuum model for modeling the bulk solvent effects on both the geometrical and electronic structures. Two hybrid functionals (B3LYP and PBE0) and several basis sets, some including f polarization functions, have been used. B3LYP provides the most accurate raw estimates, but once simple linear regression is performed, both functionals give similar results with a small advantage for PBE0. By use of the latter, the mean absolute deviation with respect to experiment is limited to 0.06 eV whereas less than 20% of the estimates differ from absorption data by more than 0.10 eV. To assess the validity limits of our model, compounds containing multiple C:S chromophores have also been considered.

Journal of Physical Chemistry A published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Quality Control of 6972-05-0.

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

Ito, Kazuya published the artcileCoordination hybrid of silsesquioxane containing phosphine oxide and an europium complex, Recommanded Product: Allyldiphenylphosphine oxide, the publication is Kobunshi Ronbunshu (2010), 67(7), 412-415, database is CAplus.

A phosphorescent coordination hybrid was successfully prepared from silsesquioxane containing phosphine oxide and Eu tris ¦Â-diketonate. The novel silsesquioxane was synthesized by the sol-gel reaction of corresponding trialkoxysilane obtained by the ene-thiol reaction of allyldipenylphosphine oxide and mercaptopropyltriethoxysilane. Despite the high concentration of the Eu complex (50%), the complex was dispersed completely into the silsesquioxane, giving a dense, homogeneous, and transparent hybrid thin film. The luminescence property of this film was also studied. This hybrid thin film with the embedded Eu complex shows bright phosphorescence accompanied with a characteristic sharp spectrum derived from the f-f transition of Eu at ambient temperature The enhancement of the emission intensity and the branching ratio for the Eu complex in the hybrid compared to the Eu complex in PMMA is due to the formation of a coordination bond between the Eu complex and the phosphine oxide in silsesquioxane.

Kobunshi Ronbunshu 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

Nokami, Toshiki published the artcileMultiple alkylation of thiophene derivatives with simple and extended diarylcarbenium ion pools, Synthetic Route of 457-68-1, the publication is Electrochemistry (Tokyo, Japan) (2013), 81(5), 399-401, database is CAplus.

The reactions of thiophene derivatives, bithiophene, and terthiophene with an electrochem. generated diarylcarbenium ion pool afforded multiple alkylation products. Extended diarylcarbenium ion pools afforded dendritic mols. by the multiple alkylation of bithophene and terthiophene.

Electrochemistry (Tokyo, Japan) 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, Synthetic Route of 457-68-1.

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

Terao, Kimitada published the artcileA new highly sterically demanding silyl (TEDAMS) group. Synthesis by multiple substitution of tris(diphenylmethyl)silane with diarylcarbenium ions, Application of Bis(4-fluorophenyl)methane, the publication is Tetrahedron Letters (2010), 51(31), 4107-4109, database is CAplus.

A highly efficient electrochem. method for synthesis of halosilanes bearing bulky substituents was developed. Electrophilic multiple substitution on tris(diphenylmethyl)silane with diarylcarbenium ions afforded a highly sterically demanding hydrosilane, tris(extended diarylmethyl)silane (TEDAMS-H), which was converted to the corresponding bromosilane (TEDAMS-Br).

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 C16H12O, Application of Bis(4-fluorophenyl)methane.

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

Nokami, Toshiki published the artcileElectrochemical synthesis of dendritic diarylcarbenium ion pools, Quality Control of 457-68-1, the publication is Tetrahedron (2011), 67(25), 4664-4671, database is CAplus.

Dendritic diarylcarbenium ion pools were synthesized by the low temperature electrochem. oxidation of the corresponding dendritic (diarylmethyl)trimethylsilanes, which were prepared by use of the iterative method consisting of electrochem. activation and Friedel-Crafts type coupling. Time-course NMR studies revealed that thermal stability of dendritic diarylcarbenium ions depends both on the generation of the dendritic structure and on the para-substituents of the terminal Ph groups. Dendritic diarylcarbenium ions up to the third generation exhibited high reactivity as a carbon electrophile.

Tetrahedron 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, Quality Control of 457-68-1.

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

Fujita, T. published the artcileThe reaction of carboxylic acids with conjugated olefins using sodium naphthalenide in the presence of N,N,N’,N’-tetramethylethylenediamine, Application In Synthesis of 1949-41-3, the publication is Synthesis (1979), 310-11, database is CAplus.

4-Phenylbutanoic acids Ph(CH₂)₂CRR¹CO₂H (R = H, Me; R¹ = H, C₁-C₄ alkyl) were prepared in 5-46% yields by treating PhCH:CH₂ with RR¹CHCO₂H in THF in the presence Na or Li naphthalenide and (Me₂NCH₂)₂. Similar reaction of Me₂CHCO₂H with isoprene or myrcene gave R²CH₂CMe:CHCH₂CMe₂CO₂H (R² = H, Me₂C:CHCH₂) in 66 and 33% yields, resp.

Synthesis published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C11H14O2, Application In Synthesis of 1949-41-3.

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

Ikeda, Osamu published the artcileAdsorption effects of highly polarizable organic compounds on electrode kinetics, Name: 1,1-Dimethylthiourea, the publication is Bulletin of the Chemical Society of Japan (1984), 57(12), 3363-7, database is CAplus.

Adsorption effects of urea; 1,1-dimethylurea; tetramethylurea; thiourea; 1,1-dimethylthiourea; and tetramethylthiourea on electrode kinetics were studied by using the electrode reactions of Zn²⁺/Zn(Hg) and Eu³⁺/Eu²⁺. The standard rate constant for Zn²⁺/Zn(Hg) is controlled by the inner-layer permittivity. The effect of this permittivity is explained in terms of the solvent reorganization energy. The effect of the adsorbates on the electrode kinetics of Eu³⁺/Eu²⁺ cannot be explained in terms of the inner layer permittivity. These 2 results suggest different locations for the formation of the activated complex: inside the adsorption layer for Zn²⁺ and just outside the layer for Eu³⁺.

Bulletin of the Chemical Society of Japan published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Name: 1,1-Dimethylthiourea.

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

Nelson, Adam published the artcileAsymmetric dihydroxylation of allylic phosphine oxides, Category: catalysis-chemistry, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1997), 2645-2657, database is CAplus.

Diphenylphosphinoyl diols have been produced by asym. dihydroxylation (AD) of allylic phosphine oxides and have been useful synthetic intermediates. The results of this study are discussed in terms of the model which has been proposed by Sharpless to explain the enantioselectivity of his AD reaction. Thus, Sharpless asym. dihydroxylation of (E)-1-diphenylphosphinoylbut-2-ene (preparation given) in the presence of AD-mix-¦Á/sulfonamide in alc./water gave 84% (2R,3S)-1-diphenylphosphinoylbutane-2,3-diol. The dihydroxylation results are thus of both mechanistic and synthetic value.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic 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 C15H15OP, Category: catalysis-chemistry.

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

Grayson, J. Ian published the artcile[(Phenylthio)allyl]- and [(phenylthio)vinyl]phosphine oxides. Synthesis of 1-(phenylthio)butadienes and a three-component synthesis of ketones, Synthetic Route of 4141-48-4, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1987), 967-76, database is CAplus.

The functionalization of some substituted allyl- and vinyldiphenylphosphine oxides is explored and routes to substituted ¦Ã-phenylthioallyl- and ¦Ã-phenylthiovinylphosphine oxides are described. These reagents are used in the synthesis of the title compounds Thus, reaction of Ph₂P(O)CHMeSPh (I) with Ac₂O for 8 days under acidic conditions gives 65% Ph₂P(O)C(SPh):CH₂ (II). I also forms 66% II by direct chlorination with N-chlorosuccinimide in CCl₄ and subsequent HCl elimination on silica. Treatment of II with RLi (R = Me, Bu, Me₂CHCH₂) followed with NH₄Cl-H₂O affords Ph₂P(O)CH(CH₂R)SPh. Addition of MeLi to II followed with PhCHO gives PhSC(CH₂Me):CHPh, which is hydrolyzed to give MeCH₂COCH₂Ph. The deprotonation and subsequent alkylation or thiolation reactions are presented for a variety of alkenyldiphenylphosphine oxides.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) 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, Synthetic Route of 4141-48-4.

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