Tag: M.W=250-300

Ghosh, Titli; Mukherji, Ananya; Kancharla, Pavan K. published the artcile< Sterically Hindered 2,4,6-Tri-tert-butylpyridinium Salts as Single Hydrogen Bond Donors for Highly Stereoselective Glycosylation Reactions of Glycals>, Product Details of C12H20O6, the main research area is oligosaccharide preparation sterically hindered butylpyridinium catalyst stereoselective glycosylation glycal.

We demonstrate here that the strained and bulky protonated 2,4,6-tri-tert-butylpyridine salts serve as efficient catalysts for highly stereoselective glycosylations of various glycals. Moreover, the mechanism of action involves an interesting single hydrogen bond mediated protonation of glycals and not via the generally conceived Bronsted acid pathway. The counteranions also play a role in the outcome of the reaction.

Organic Letters published new progress about Glycals Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, Product Details of C12H20O6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Krishnan, Nithiyanandan; Perumal, Devanathan; Atchimnaidu, Siriki; Harikrishnan, Kaloor S.; Golla, Murali; Kumar, Nilima Manoj; Kalathil, Jemshiya; Krishna, Jithu; Vijayan, Dileep K.; Varghese, Reji published the artcile< Galactose-Grafted 2D Nanosheets from the Self-Assembly of Amphiphilic Janus Dendrimers for the Capture and Agglutination of Escherichia coli>, Related Products of 4064-06-6, the main research area is galactose grafted 2D nanosheet selfassembly Janus dendrimer Escherichia agglutination; 2D materials; amphiphiles; bacterial capture; fluorescence; self-assembly.

High aspect ratio, sugar-decorated 2D nanosheets are ideal candidates for the capture and agglutination of bacteria. Herein, the design and synthesis of two carbohydrate-based Janus amphiphiles that spontaneously self-assemble into high aspect ratio 2D sheets are reported. The unique structural features of the sheets include the extremely high aspect ratio and dense display of galactose on the surface. These structural characteristics allow the sheet to act as a supramol. 2D platform for the capture and agglutination of E. coli through specific multivalent noncovalent interactions, which significantly reduces the mobility of the bacteria and leads to the inhibition of their proliferation. Our results suggest that the design strategy demonstrated here can be applied as a general approach for the crafting of biomol.-decorated 2D nanosheets, which can perform as 2D platforms for their interaction with specific targets.

Chemistry – A European Journal published new progress about Agglutination. 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, Related Products of 4064-06-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Sun, Shang-Zheng; Romano, Ciro; Martin, Ruben published the artcile< Site-Selective Catalytic Deaminative Alkylation of Unactivated Olefins>, Category: alcohols-buliding-blocks, the main research area is catalyst deaminative alkylation unactivated olefin.

A catalytic deaminative alkylation of unactivated olefins is described. The protocol was characterized by its mild conditions, wide scope, including the use of ethylene as substrate, and exquisite site-selectivity pattern for both α-olefins and internal olefins, thus unlocking a new catalytic platform to forge sp3-sp3 linkages, even in the context of late-stage functionalization.

Journal of the American Chemical Society published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Von Nehring, Erich Scott; Dragojlovic, Veljko published the artcile< Handling of air-sensitive and moisture-sensitive reagents in an undergraduate chemistry laboratory: the importance of the syringe>, Formula: C19H16O, the main research area is air moisture sensitive reagent graduate education chem laboratory.

A relatively large number of organic and inorganic chem. reagents are air- or moisture-sensitive, and undergraduate students should be trained in their use. When handling such reagents, it is important to select the correct syringe and to use that syringe correctly. We have found that the best syringe for use in an undergraduate setting is a fully plastic polypropylene (PP) Luer lock syringe. While generally safe, such a syringe should be treated as a single-use syringe. Repeated exposure to an organic solvent causes progressively more resistance to the movement of the plunger, or its complete freeze. Thus, when drawing in a volume of liquid that is close to the capacity of the syringe, the plunger could be inadvertently pulled out causing a spill.

Journal of Chemical Education published new progress about Chemical spills. 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Formula: C19H16O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liu, Na; Zhang, Jince; Wen, Jingyi; You, Xiaolei; Fang, Dawei published the artcile< Immortal polymerization of LA: the influence of steric effects, electronic effects and pKa on chain transfer agents>, Safety of Triphenylmethanol, the main research area is lactide immortal ring opening polymerization chain transfer agent; steric electronic effect.

The “”immortal”” ring-opening polymerization (iROP) of L-LA, catalyzed by ligand-free Ca[N(SiMe3)2]2(THF)2 in combination with different chain transfer agents (alcs., phenols and PhCH2NH2) was systematically investigated for the first time. When alcs. were used as CTAs (pKa: 14.36-12.73), the polymerization proceeded smoothly and efficiently in excess of PhCH2OH and Ph2CHOH feeding, through which the mol. weights of the obtained PLAs could be precisely controlled by the monomer/alcs. and the mol. weight distributions were maintained at a very narrow level, showing a typically immortal characterization. Upon increasing the steric effect of the alc. (Ph3COH), the activity became lower and the mol. weight distribution became broader than those of PhCH2OH and Ph2CHOH, indicating that the steric effect of alcs. has a significant influence on the iROP of LA. Whereas for the phenol-based CTAs (pKa: 10.17-7.15), the electronic effect was obvious for the ROP of L-LA. The study of the active species indicated that the Ca-O group was the initiation group for alc.- and phenol-based systems. There exists two active species (Ca-NHCH2Ph/Ca-N(SiMe3)2) in the Ca[N(SiMe3)2]2(THF)2/PhCH2NH2 system. The polymerization kinetic behaviors showed that the catalytic activity follows the order of PhCH2OH > Ph2CHOH > PhOH > PhCH2NH2. The kapp of Ph2CHOH increased firstly and then decreased with the increase of the CTA, indicating that the CTA promoted the propagation of polymerization firstly and then decreased the propagation of polymerization

Polymer Chemistry published new progress about Chain transfer agents. 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Safety of Triphenylmethanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ma, Zhiyuan; Cunningham, Alexander J.; Zhu, X. X. published the artcile< Enzymatic Conversion of Galactose Polymers into Copolymers Containing Galactonic Acid by Glucose Oxidase>, SDS of cas: 4064-06-6, the main research area is copolymer PEG glycopolymer glucose oxidase.

Sugar oxidase can oxidize a carbohydrate substrate into an acid, but there have been no reports on the successful enzymic conversion of glycopolymers containing carbohydrate pendants. We introduced a poly(ethylene glycol) (PEG) spacer between the carbohydrate and the methacrylic units, and glucose oxidase (GOx) showed enzymic activity when the PEG spacer is sufficiently long, converting the galactose pendant into galactonic acid and yielding a copolymer. The glycopolymers with a PEG spacer showed stronger binding to the sugar-specific lectin than those without the spacer, while the binding was gradually weakened as the sugar pendants were converted to acid groups. To the best of our knowledge, this is the first example to use a hydrophilic PEG spacer to enzymically convert a substrate attached on a polymer chain. The enzymic conversion of such glycopolymers represents a useful green chem. approach to obtain copolymers based on carbohydrates.

Biomacromolecules published new progress about Enzymic oxidation. 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, SDS of cas: 4064-06-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Otsuka, Yuji; Yamamoto, Toshihiro; Fukase, Koichi published the artcile< β-Selective Glycosylation by Using O-Aryl-Protected Glycosyl Donors>, Recommanded Product: ((3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4′,5′-d]pyran-5-yl)methanol, the main research area is aryl thioglycoside preparation stereoselective glycosylation aryliodonium triflate; glycosylation; protecting groups; stereoselectivity; synthetic methods; thioglycosides.

New glycosyl donors have been developed that contained several para-substituted O-aryl protecting groups and their stereoselectivity for the glycosylation reaction was evaluated. A highly β-selective glycosylation reaction was achieved by using thioglycosides that were protected by 4-nitrophenyl (NP) groups, which were introduced by using the corresponding diaryliodonium triflate. Anal. of the stereoselectivities of several glycosyl donors indicated that the β-glycosides were obtained through an SN2-type displacement from the corresponding α-glycosyl triflate. The NP group could be removed by reduction of the nitro group and acylation, followed by oxidation with ceric ammonium nitrate (CAN).

Chemistry – An Asian Journal published new progress about Acylation. 4064-06-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H20O6, Recommanded Product: ((3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyltetrahydro-3aH-bis([1,3]dioxolo)[4,5-b:4′,5′-d]pyran-5-yl)methanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Mondal, Prasenjit; Lovisari, Marta; Twamley, Brendan; McDonald, Aidan R. published the artcile< Fast Hydrocarbon Oxidation by a High-Valent Nickel-Fluoride Complex>, Category: alcohols-buliding-blocks, the main research area is hydrocarbon oxidation kinetics bond dissociation enthalpy activation entropy; fluorination; high-valent oxidants; metal-oxo species; oxidation catalysis; reactive intermediates.

In the search for highly reactive oxidants we have identified high-valent metal-fluorides as a potential potent oxidant. The high-valent Ni-F complex [NiIII(F)(L)] (2, L=N,N’-(2,6-dimethylphenyl)-2,6-pyridinedicarboxamidate) was prepared from [NiII(F)(L)]- (1) by oxidation with selectfluor. Complexes 1 and 2 were characterized by using 1H/19F NMR, UV-vis, and EPR spectroscopies, mass spectrometry, and X-ray crystallog. Complex 2 was found to be a highly reactive oxidant in the oxidation of hydrocarbons. Kinetic data and products anal. demonstrate a hydrogen atom transfer mechanism of oxidation The rate constant determined for the oxidation of 9,10-dihydroanthracene (k2=29 M-1 s-1) compared favorably with the most reactive high-valent metallo-oxidants. Complex 2 displayed reaction rates 2000-4500-fold enhanced with respect to [NiIII(Cl)(L)] and also displayed high kinetic isotope effect values. Oxidative hydrocarbon and phosphine fluorination was achieved. Our results provide an interesting direction in designing catalysts for hydrocarbon oxidation and fluorination.

Angewandte Chemie, International Edition published new progress about Activation enthalpy. 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Meng, Shan-Shui; Tang, Xiaowen; Luo, Xiang; Wu, Ruibo; Zhao, Jun-Ling; Chan, Albert S. C. published the artcile< Borane-Catalyzed Chemoselectivity-Controllable N-Alkylation and ortho C-Alkylation of Unprotected Arylamines Using Benzylic Alcohols>, Computed Properties of 76-84-6, the main research area is borane catalyzed chemoselectivity controllable nitrogen ortho carbon alkylation; alkylation unprotected arylamine benzylic alc DFT calculation.

An unprecedented protocol for the efficient and highly chemoselective alkylation of unprotected arylamines using alcs. catalyzed by B(C6F5)3 has been developed. The reaction gives N-alkylated products and ortho C-alkylated products in different solvents in good chemoselectivities and yields. Control experiments and DFT calculations indicated that the borane underwent alc./arylamine exchange to ensure catalytic activity, and a possible mechanism involving a carbocation is proposed.

ACS Catalysis published new progress about Alkylation. 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Computed Properties of 76-84-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhang, Shi-Yue; Gong, Wei-Tao; Qu, Wei-Dong; Deng, Xiao-Rong; Dong, Kai-Xun; Zhang, Shu-Guang; Ning, Gui-Ling published the artcile< Construction of Ionic Porous Organic Polymers (iPOPs) via Pyrylium Mediated Transformation>, Formula: C19H16O, the main research area is chromium carbon dioxide ionic porous organic polymer adsorption.

Two new ionic porous organic polymers (iPOPs) with different counter anions were successfully fabricated via well-known pyrylium mediated transformation into pyridinium. 13C solid-state NMR, XPS, and FTIR were analyzed and confirmed the formation of pyridinium in the network. Containing charged and aromatic networks, both iPOPs exhibit a high affinity towards toxic hexavalent chromium Cr(VI) ions. What is more, it has been demonstrated that both CO2 adsorption and Cr(VI) removal properties can be tuned by simply varying counter anions.

Chinese Journal of Polymer Science published new progress about Adsorption. 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Formula: C19H16O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts