Tag: M.W:300-400

Reference of 10343-06-3. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 10343-06-3, Name is 2,3,4,6-Tetra-o-acetyl-D-glucopyranose

Synthetic studies of moenomycin a disaccharide analogues. Protection of the anomeric centre with long-chain protective groups

Two new C9 protecting groups for the anomeric position of carbohydrates are reported. Methods both for their introduction and removal are described. The C9-protected compounds are much less polar than the corresponding allyl protected analogues. The new protecting group chemistry has been used to prepare compound 17 en route to a disaccharide analogue of the antibiotic moenomycin A.

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Reference of 10343-06-3. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 10343-06-3, Name is 2,3,4,6-Tetra-o-acetyl-D-glucopyranose. In a document type is Article, introducing its new discovery.

Esterase catalyzed regioselective hydrolyses of acetylated monosaccharides

Deacylations of fully acylated D-glucopyranoses, methyl D-glucopyranosides, 2-acetamido-2-deoxy-D-glucopyranoses glucopyranoses and methyl 2-acetamido-2-deoxy-D-glucopyranosides catalyzed by rabbit serum or the esterase isolated from rabbit serum were investigated. Depending on the structure of the acyl protecting group a high degree of regioselectivity is observed. Products of enzymic hydrolysis followed by intramolecular migrations of acetyl groups are also described.

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a Article，once mentioned of 499-40-1, Application In Synthesis of (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal

Electronic properties? modulation of D?A?A via fluorination of 2-cyano-2-pyran-4-ylidene-acetic acid acceptor unit for efficient DSSCs: DFT-TDDFT approach

Considerable attentions have been drawn towards modulation of organic dyes with the goal of realizing effectual dye-sensitized solar cells using density functional theory (DFT). In this respect, a series of D?A1?A2 dyes containing 2-vinyl-5-(5-vinyl-2-thienyl) thiophene bridged with C=S group (A1), 2-Cyano-2-pyran-4-ylidene-acetic acid (A2) and tertiary aromatic amines as donor (D) were designed and theoretically investigated for dye-sensitized solar cells (DSSCs). These dyes were simulated using DFT and time-dependent density functional theory to calculate their electronic and optical properties, molecular reactivity indices, natural population analysis, maximum open circuit voltage (VOC) and light harvesting efficiency (LHE). The results showed that the position as well as number of fluorine atoms on Cyano-2-pyran-4-ylidene-acetic acid unit have effect on the electronic properties without necessary change the band gap energy of the dyes; therefore tuned/modulated molecular properties of the dyes. Also, dyes with donor unit containing N,N-diphenylaniline (DA-7) presented lowest band gap than those containing N-(2-pyridyl)pyridin-2-amine (DA-8) and carbazole (DA-9); thus N-phenyl-aniline unit is a better electron donor.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Application In Synthesis of (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, you can also check out more blogs about499-40-1

Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Reference of 64519-82-0, An article , which mentions 64519-82-0, molecular formula is C12H24O11. The compound – (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol played an important role in people’s production and life.

Low calorie sweeteners differ in their physiological effects in humans

Low calorie sweeteners (LCS) are prevalent in the food supply for their primary functional property of providing sweetness with little or no energy. Though tested for safety individually, there has been extremely limited work on the efficacy of each LCS. It is commonly assumed all LCS act similarly in their behavioral and physiological effects. However, each LCS has its own chemical structure that influences its metabolism, making each LCS unique in its potential effects on body weight, energy intake, and appetite. LCS may have different behavioral and physiological effects mediated at the sweet taste receptor, in brain activation, with gut hormones, at the microbiota and on appetitive responses. Further elucidation of the unique effects of the different commercially available LCS may hold important implications for recommendations about their use for different health outcomes.

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a Article，once mentioned of 499-40-1, Formula: C12H22O11

Non-covalent DNA binding and cytotoxicity of certain mixed-ligand ruthenium(II) complexes of 2,2?-dipyridylamine and diimines

A series of mixed ligand ruthenium(ii) complexes [Ru(Hdpa) 2(diimine)](ClO4)21-5, where Hdpa is 2,2?-dipyridylamine and diimine is 1,10-phenanthroline (phen) and a modified/extended 1,10-phenanthroline such as, 5,6-dimethyl-1,10-phenanthroline (5,6-dmp), dipyrido[3,2-d:2?,3?-f]quinoxaline (dpq), 5-methyldipyrido[3,2-d:2?,3?-f]quinoxaline (mdpq) and dipyrido[3,2-a:2?,3?-c]phenazine (dppz) have been isolated and characterized by analytical and spectral methods. The complex [Ru(Hdpa) 2(phen)](PF6)21 has been structurally characterized and the coordination geometry around Ru(ii) in it is described as distorted octahedral. 1H NMR spectral data reveal that 1-5 should have a C2 symmetry lying on the diimine plane due to the rapid flapping of the coordinated Hdpa ligands. The interaction of the complexes with calf thymus (CT) DNA has been explored by using absorption and emission spectral and viscometry and electrochemical techniques and the mode of DNA binding of the complexes has been proposed. The DNA binding affinity of the complexes decreases with decrease in number of planar aromatic rings in the co-ligand supporting the intercalation of the diimine co-ligands in between the DNA base pairs. Circular dichroic spectral studies reveal that the complexes 3-5 exhibit induced circular dichroism upon binding to CT DNA. Interestingly, upon interaction with CT DNA all the complexes show an increase in anodic current in the cyclic voltammograms suggesting that they are involved in electrocatalytic guanine oxidation. Interestingly, of all the complexes, only 5 alters the DNA superhelicity upon binding with supercoiled pBR322 DNA, which is consistent with its higher DNA binding affinity. Further, the cytotoxicities of the complexes against human cervical epidermoid carcinoma cell line (ME180) have been examined. Interestingly, 5 exhibits a cytotoxicity against ME180 higher than other complexes with potency approximately 8 times more than cisplatin for 24 h incubation but 4 times lower than cisplatin for 48 h incubation. The Royal Society of Chemistry 2008.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C12H22O11. In my other articles, you can also check out more blogs about 499-40-1

Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 499-40-1, Name is (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal, molecular formula is C12H22O11. In a Article，once mentioned of 499-40-1, Formula: C12H22O11

Preparation, crystal structures and spectroscopic properties of vanadium(III) complexes with [V-O-V]4+ cores

Dinuclear vanadium(III) complexes, [V2(mu-O)(phen)4Cl2]Cl2 ·2Me2CO (1) and [V2(mu-O)(dpya)4Cl2]Cl2 (2) [phen = 1,10-phenanthroline; dpya = bis(2-pyridyl)amine], have been synthesized from the reaction of VCl3 or VCl3(THF)3 with bidentate nitrogenous ligands. The ligand substitution reaction between NaNCS and 2 yields a brown dinuclear complex, [V2(mu-O)(dpya)3(NCS)4]·2THF (3), in which each vanadium ion has a different coordination environment, and an orange mononuclear complex, [V(dpya)(NCS)4]·(Hdpya)·THF (4). Complexes 1-3 contain singly bridged [V-O-V]4+ cores. From the temperature dependence of the magnetic susceptibilities, weak magnetic interactions are observed for 1-3. UV-Vis and resonance Raman spectra of these complexes are described. The 1H NMR spectrum of 1, in which two vanadium ions are coupled antiferromagnetically, and those of its analogs have been measured and assigned.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Formula: C12H22O11. In my other articles, you can also check out more blogs about 499-40-1

Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Application of 10034-20-5. Let’s face it, organic chemistry can seem difficult to learn. Especially from a beginner’s point of view. Like 10034-20-5, Name is (2S,3R,4R,5S,6R)-6-(Acetoxymethyl)-3-aminotetrahydro-2H-pyran-2,4,5-triyl triacetate hydrochloride. In a document type is Article, introducing its new discovery.

Study on synthesis of 2-(substituted benzylidene)amino-2-deoxy-1,3,4,6- tetra-O-acetyl-beta-D-glucopyranoses from D-glucosamine

The conditions in catalysts and in reaction time for the reaction of protected beta-D-glucosamine hydrochloride with different substituted benzaldehydes have been investigated in the presence of various inorganic and organic bases. Based on obtained results, the general procedure for the synthesis of Schiff’s bases from tetra-O-acetyl-beta-D-glucosamine hydrochloride and substituted benzaldehydes has been optimized. Reaction yields were 28-80%. Azomethines 6a-i have the scavenging effect on the DPPH radical with values of IC50 of 50-75 muM.

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Related Products of 499-40-1, An article , which mentions 499-40-1, molecular formula is C12H22O11. The compound – (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal played an important role in people’s production and life.

In vitro cytotoxicity, DNA cleavage and SOD-mimic activity of copper(II) mixed-ligand quinolinonato complexes

Six mixed-ligand copper(II) complexes with the composition [Cu(qui)(L)]BF4·xH2O (1-6), where Hqui = 2-phenyl-3-hydroxy-4(1H)-quinolinone, L = 2,2?-bipyridine (bpy) (1), 1,10-phenanthroline (phen) (2), bis(2-pyridyl)amine (ambpy) (3), 5-methyl-1,10-phenanthroline (mphen) (4), 5-nitro-1,10-phenanthroline (nphen) (5) and bathophenanthroline (bphen) (6), were prepared, fully characterized and studied for their in vitro cytotoxicity on human osteosarcoma (HOS) and human breast adenocarcinoma (MCF7) cancer cell lines. The overall promising results of the cytotoxicity were found for all the complexes, while the best results were achieved for complex 6, with IC50 = 2.6 ± 0.8 muM (HOS), and 1.3 ± 0.5 muM (MCF7). The interactions of the Cu(II) complexes 1-6 with calf thymus DNA were investigated by the UV-visible spectral titration. An agarose-gel electrophoretic method of oxidative damage determination to circular plasmid pUC19 was used to assess the ability of the complexes to act as chemical nucleases. A high effectiveness of DNA cleavage was observed for 2, 4 and 5. In vitro antioxidative activity of the complexes was studied by the superoxide dismutase-mimic (SOD-mimic) method. The best result was afforded by complex 1 with IC50 = 4.7 ± 1.0 muM, which corresponds to 10.2% of the native Cu,Zn-SOD enzyme activity. The ability of the tested complexes to interact with sulfur-containing biomolecules (cysteine and reduced glutathione) at physiological levels was proved by electrospray-ionization mass spectrometry (ESI-MS).

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.81025-04-9, Name is Lactitol monohydrate, molecular formula is C12H26O12. In a Article，once mentioned of 81025-04-9, Recommanded Product: 81025-04-9

Swelling and protein absorption/desorption of thermo-sensitive lactitol- based polyether polyol hydrogels

A series of thermo-sensitive hydrogels has been prepared from reactions of acylated poly(ethylene glycol) bis(carboxymethyl) ether (PEGBCOCl) (M(n)) = 600 dalton) with lactitol based polyether polyols (LPEPs). These LPEP hydrogels swelled extensively in water at neutral pH and their swelling behaviors depended strongly on the PEGBCOCl:LPEP molar ratios or extent of PEGBCOCl crosslinking. A maximum swelling of 81 fold was observed on hydrogels formed with LPEP (M(n)) = 4055 dalton) at a PEGBCOCl:LPEP molar ratio of 4.25. At temperatures above 25C, the hydrogels exhibited a phase transition and collapsed, expelling water. These super-absorbent hydrogels were stable under acidic conditions, but were sensitive to base hydrolysis. Enzyme proteins, i.e. lipase, were incorporated in the hydrogels (0.4-1.2 mg/g) by immersing the collapsed hydrogels in the protein solutions at 25C. Protein desorption at 40C occurred rapidly with over 90% of protein released during the first hour. The extent of protein desorption was similar among hydrogels with varying levels of absorbed proteins. The release of the lipase protein molecules is due to the structural collapse of the hydrogels and is not diffusion controlled. (C) 2000 Elsevier Science Ltd. A series of thermo-sensitive hydrogels has been prepared from reactions of acylated poly(ethylene glycol) bis(carboxymethyl) ether (PEGBCOCl) (Mn = 600 dalton) with lactitol-based polyether polyols (LPEPs). These LPEP hydrogels swelled extensively in water at neutral pH and their swelling behaviors depended strongly on the PEGBCOCl:LPEP molar ratios or extent of PEGBCOCl crosslinking. A maximum swelling of 81 fold was observed on hydrogels formed with LPEP (Mn = 4055 dalton) at a PEGBCOCl:LPEP molar ratio of 4.25. At temperatures above 25 C, the hydrogels exhibited a phase transition and collapsed, expelling water. These super-absorbent hydrogels were stable under acidic conditions, but were sensitive to base hydrolysis. Enzyme proteins, i.e. lipase, were incorporated in the hydrogels (0.4-1.2 mg/g) by immersing the collapsed hydrogels in the protein solutions at 25 C. Protein desorption at 40 C occurred rapidly with over 90% of protein released during the first hour. The extent of protein desorption was similar among hydrogels with varying levels of absorbed proteins. The release of the lipase protein molecules is due to the structural collapse of the hydrogels and is not diffusion controlled.

The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 81025-04-9 is helpful to your research., Recommanded Product: 81025-04-9

Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 499-40-1, C12H22O11. A document type is Article, introducing its new discovery., Application In Synthesis of (2R,3S,4R,5R)-2,3,4,5-Tetrahydroxy-6-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexanal

Crystal structures, spectro-structural correlation and structural pathways of eight [Cu(dpyam)2(NCO)][Y] complexes (dpyam = di-2-pyridylamine), Y = Br-, CF3 SO3-, BF4- · dpyam, Cl- · 4H2O, NO3-, PF6-, ClO[…].

The crystal structures of eight new [Cu(dpyam)2(NCO)][Y] complexes which Y = Br- (1), CF3 SO3- (2), BF4- · dpyam (3), Cl- · 4H2O (4), NO3- (5), PF6- (6), ClO4- (7) and BPh4- (8), respectively have been determined by X-ray crystallography. Five of the complexes, 1-5 (tau = 0.09-0.30) have a CuN4N? chromophore with a trigonal bipyramidal distorted square based pyramidal (TBDSBP) stereochemistry, 6 and 7 (tau = 0.53-0.54) involve an intermediate five-coordinate stereochemistry, while 8 (tau = 0.76) involves a square base pyramidal distorted trigonal bipyramidal (SBPDTB) stereochemistry. The structures of 1-8 are compared by scatter-plot analysis with [Cu(dpyam)(NCO)][SO4]0.5 · dpyam · 0.5H2O (9), the only complex of known crystal structure within this series reported to date. Scatter plots of the cations distortion isomers of the [Cu(dpyam)2(NCO)][Y] series of complexes suggests that all nine complexes lie on a common structural pathway, involving a mixture of symmetric, nusym, C2 mode and asymmetric, nuasym, non-C2 modes of vibration of the CuN4N? chromophore. The resulting linear and parallel structural pathways are consistent with the direct observation of the effect of vibronic coupling on the stereochemistries of the complexes, which can range from SBPDTB to TBDSBP which correlate with electronic spectral data. The EPR spectra (K-band and V-band) of complexes 1-7 are in rhombic type, while complex 8 is axial with g? = 2.185 and g? = 2.005, consistent with a dz2 ground state for the approximately trigonal bipyramidal stereochemistry of the CuN4N? chromophore. These are in agreement with electronic reflectance spectra of the complexes and correspond to their stereochemistries.

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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics