Category: chiral-catalyst

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. 2133-34-8, Name is (S)-Azetidine-2-carboxylic acid, molecular formula is C4H7NO2. In a Patent£¬once mentioned of 2133-34-8, Quality Control of: (S)-Azetidine-2-carboxylic acid

CYCLOHEXYLALANINE DERIVATIVES AS DIPEPTIDYL PEPTIDASE-IV INHIBITORS FOR THE TREATMENT OR PREVENTION OF DIABETES

The present invention is directed to novel cyclohexylalanine derivatives which are inhibitors of the dipeptidyl peptidase-IV enzyme (“”DP-IV inhibitors””) and which are useful in the treatment or prevention of diseases in which the dipeptidyl peptidase-IV enzyme is involved, such as diabetes and particularly type 2 diabetes. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which the dipeptidyl peptidase-IV enzyme is involved.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Quality Control of: (S)-Azetidine-2-carboxylic acid. In my other articles, you can also check out more blogs about 2133-34-8

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Chiral Catalysts,
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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. 23190-16-1, Name is (1R,2S)-(?)-2-Amino-1,2-diphenylethanol, molecular formula is C6H5CH(NH2)CH(C6H5)OH. In a Article£¬once mentioned of 23190-16-1, Product Details of 23190-16-1

Studies on reaction conditions and new entry to chiral ligands in the chiral lithium amide-mediated enantioselective aldol reaction

Reaction conditions for the enantioselective aldol reaction of 2,2-dimethyl-3-pentanone (3) and benzaldehyde using the chiral lithium amide 1b as a chiral auxiliary were thoroughly investigated. All three procedures, that is, (1) the combined use of lithium diisopropylamide and the chiral lithium amide 1b, (2) the use of an excess of the chiral lithium amide 1b, and (3) the regeneration of the chiral lithium amide 1b, afforded the aldol 4 in about 90% yield and 70% enantiomeric excess (ee). Investigation of the effects of solvent by utilizing 1-naphthaldehyde revealed that in tetrahydrofuran, (S,S)-aldol 5 of 77% ee was obtained as the major product, while in ether (R,R)-5 became the major isomer (38% ee). Furthermore, addition of hexamethylphosphoric triamide caused a dramatic change of stereoselectivity, and (S,S)-5 of 70% ee was obtained in ether with 20 eq of hexamethylphosphoric triamide. The aldol 4 of 74% ee was obtained when the new chiral lithium amide 6b was used.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Product Details of 23190-16-1, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 23190-16-1, in my other articles.

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Chiral Catalysts,
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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. 1806-29-7, C12H10O2. A document type is Article, introducing its new discovery., Recommanded Product: 1806-29-7

Metal tetrahydroborates and tetrahydroborato metallates, 30 [1]. Alkoxo-substituted alkali metal tetrahydroborates: Studies in solution and structures in the solid state

Reactions of MBH4 (M = Li, Na, K) with tBuOH, Ph3COH, PhOH, F5C6OH, and 2,4-tBu2C6H 3OH in THF in a 1:1 ratio were followed by 11B NMR spectroscopy. No M[H2B(OR)2] species could be detected, but minor amounts of M[H3BOR] and larger amounts of M[HB(OR) 3]. In the reaction of LiBH4 with 2,4-tBu 2C6H3OH also a fair proportion of (RO) 2BH was generated. The perfluorophenolato borane (F5C 6O)2BH¡¤THF was prepared from the phenol and BH 3¡¤THF in THF solution. It is unstable to disproportionation. Compound (C6F5O)3B¡¤THF was isolated and its crystal structure determined. Reaction of LiBH4 with F 5C6OH in hexane generated a solid that proved to be Li[H2B(OC6F5)2]. It is unstable in THF. On the other hand, 2,2?-dihydroxydiphenyl in the presence of secondary amines reacts to give Li[C12H8O 2B(NR2)2] (3-5). Li[B(O2C 12H8)2], 2, is formed when HN(tBu)Ph is used as a secondary amine. The unstable phthalatoborane H{C6H 4[C(O)O]2}BH¡¤THF (7), is stabilized as its pyridine adduct (phth)BH¡¤py (8). 7 reacts with 3 equivalents of LitBu to give [Li(HBtBu)3] (11), isolated as its tris(THF) solvate. Analogously, 7 reacts with LiNMePh to produce compound Li[HB(NMePh)3] (10). Similarly, 7 and NaOtBu (molar ratio 1:3) give access to Na[HB(OtBu) 3] (9). In attempts to grow single crystals, specimens resulting from a hexane solution showed that partial hydrolysis has occurred to give Na[HB(OtBu)3]¡¤Na[(tBuO)2BO]¡¤Na[tBuOB(O)H], which crystallizes as a centrosymmetric dimer. While catecholborane when treated with LitBu in THF and DME gave access to (dme)2Li[catB(tBu) 2], 12 (dme)2, several compounds were observed when Li piperidide was used as nucleophile. Amongst these, the most interesting one was (dme)(THF)Li2(cat)(catBH), 13 (dme)THF, the crystal structure of which was determined. In all cases where the borate species carried OR groups the O atoms of the RO or PhO group coordinate with the alkali metal cation. DFT calculations for the series of anions H4-nBXn- showed that HBX3- is the most stable species for X = F, OH, NH2. This confirms experimental results.

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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. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article£¬once mentioned of 33100-27-5, Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane

Formation of p-phenylenediamine-crown ether-[PMo12O 40]4- salts

Electron transfer from the electron donor of p-phenylenediamine (PPD) to the electron acceptor of (H+)3[PMo12O 40]3- forms a one-electron-reduced Keggin cluster of [PMO12O40]4-, bearing a S = 1/2 spin, while proton transfer from the proton donor of (H+)3[PMO 12O40]3- to the proton acceptor of PPD yielded mono- and diprotonated cations of 4-aminoanilinium (HPPD+) and p-phenylenediammonium (H2PPD2+). By introduction of crown ether receptors during the crystallization process, supramolecular cations of (HPPD+)(crown ethers) and/or (H2PPD2+)(crown ethers) were successfully introduced into three new alpha-[PMo 12O40]4- salts of (H2PPD 2+)2([12]crown-4)4[PMo12O 40]4- (1), (HPPD+)4-([15]crown-5) 4[PMo12O40]4- (2), and (HPPD +)2(H2PPD2+)([18]crown-6) 4[PMo12O40]4- (3) as the countercation. The protonated states of PPD and moleoular-assembly structures of the supramolecular cations depended on the size of the crown ethers. In salt 3, a novel mixed-protonated state of HPPD+ and H2PPD 2+ was confirmed to be complexed in the cation structure. According to the changes in the cation structures, the anion arrangements were modulated from those of the two-dimensional layer for salt 1 to the isolated cluster for salts 2 and 3. The temperature-dependent magnetic susceptibilities of salts 1-3 were consistent with the isolated spin arrangements of [PMo12O 40]4-. The electronic spectra of salts 1-3 indicated the intervalence optical transition from pentavalent MoV to hexavalent MoVI ions within the [PMo12O40]4- cluster. Temperature-dependent electron spin resonance spectra of salt 2 revealed the delocalization-localization transition of the S = 1/2 spin at 60 K. The spin on the [PMo12O40]4- cluster was localized on a specific MoV site below 60 K, which was thermally activated with an activation energy of 0.015 eV.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 33100-27-5, in my other articles.

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Chiral Catalysts,
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Application of 21436-03-3, An article , which mentions 21436-03-3, molecular formula is C6H14N2. The compound – (1S,2S)-Cyclohexane-1,2-diamine played an important role in people’s production and life.

SUBSTITUTED IMIDAZOLE COMPOUND AND USE THEREOF

The present invention relates to a compound represented by the formula: wherein each symbol is as defined in the description, or a salt thereof or a prodrug thereof. The compound of the present invention has a superior renin inhibitory activity, and thus is useful as an agent for the prophylaxis or treatment of hypertension, various organ damages attributable to hypertension, and the like.

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In an article, published in an article, once mentioned the application of 1436-59-5, Name is cis-Cyclohexane-1,2-diamine,molecular formula is C6H14N2, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 1436-59-5

Molecular design of modifying 4-position of dibenzofuran for high temperature stability and high efficiency

A molecular design modifying 4- position of dibenzofuran with a pyridoindole moiety for high temperature stability and high efficiency was examined as an approach to develop host materials for blue phosphorescent organic light-emitting diodes. The simple pyridoindole modification of 4- position of carbazole substituted dibenzofuran lead to high glass transition temperature above 130C in addition to high quantum efficiency in the blue phosphorescent device.

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Reference of 21436-03-3, An article , which mentions 21436-03-3, molecular formula is C6H14N2. The compound – (1S,2S)-Cyclohexane-1,2-diamine played an important role in people’s production and life.

Electronic tuning of the PNNP ligand for the asymmetric cyclopropanation of olefins catalysed by [RuCl(PNNP)]+

Cationic ruthenium complexes of the type [RuCl(L)(PNNP)]+ (L=OEt2, OH2), where PNNP is the CF3-subsituted PNNP ligand N,N?-bis[o-(bis(4-trifluoromethylphenyl)phosphino)benzylidene]- (1S,2S)-diaminocyclohexane 1b, catalyse the asymmetric cyclopropanation of styrene, alpha-Me-styrene, and 1-octene with ethyl diazoacetate. These complexes are more active and give higher cis- and enantioselectivities than their analogues containing the unsubstituted ligand 1a. Thus, [RuCl(OEt2)(1b)]PF6 cyclopropanates alpha-Me-styrene with 85% cis selectivity and 86% ee in 94% isolated yield.

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Application of 1806-29-7, Chemistry can be defined as the study of matter and the changes it undergoes. You¡¯ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology.1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a patent, introducing its new discovery.

A new carbazole-based hole-transporting material with low dopant content for perovskite solar cells

A new carbazole-based hole-transporting material incorporating a 3,3?-biphenyl central core has been synthesized via a facile route. A reference compound without carbazole moiety was also prepared. Their geometric structures, thermal stability and photovoltaic properties were investigated. This new carbazole-based material exhibits a high glass transition temperature (167.8 C) and a suitable highest occupied molecular orbital level well-matched with CH3NH3PbI3 perovskite. A low doping content of 4-tert-butylpyridine (120 mM) is observed for the best performance of perovskite solar cell in conjunction with a carbon counter electrode. The device achieves a power conversion efficiency of 4.53% under illumination of 100 mW cm-2. The performance is much better than that of the reference compound (0.19%), and comparable to that of spiro-OMeTAD at the same dopant level (5.10%). The results indicate the carbazole-based material is a promising class of hole-transporting materials for perovskite solar cells.

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In an article, published in an article, once mentioned the application of 1806-29-7, Name is 2,2-Biphenol,molecular formula is C12H10O2, is a conventional compound. this article was the specific content is as follows.category: chiral-catalyst

ALKYLATION OF PHENOLIC COMPOUNDS

The invention relates to a process for O-alkyiation of a phenolic compound comprising at least two hydroxyl groups bonded to an aromatic hydrocarbon, the process comprising reacting the phenolic compound with an alkylating agent in the presence of a base, at a suitable reaction temperature and for a suitable time period, thereby alkylating the at least two hydroxy] groups. The invention also relates to O-alkylaled phenolic compounds produced by this process.

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Synthetic Route of 33100-27-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane

Propene/propane separation with copolyimide membranes containing silver ions

The aim of this project was to produce crosslinked, plasticization resistant facilitated transport membranes which can be used for the separation of olefin/paraffin mixtures. Different crosslinkable 4,4?-hexafluoro- isopropylidene diphthalic anhydride (6FDA) based copolyimides were synthesized using 3,5-diamino benzoic acid as one of the monomers providing a crosslinkable group and 15-crown-5-ether diamine suitable for creating facilitated transport sites. Crown ethers are well known for strong complexation of light metal ions but also complex formation with silver ions is possible. Thereby the ions are bonded into the cavity of the crown ether. The main advantage of this type of facilitated transport polymers is that no carrier medium is necessary which means “dry” membranes can be applied. Separation characteristics for the 15-crown-5-ether copolyimides were determined by pure gas sorption and mixed gas permeation experiments using propene and propane up to feed pressures of 8 ¡Á 105 Pa (8 bar) at a membrane temperature of 35C. Besides this a short overview on facilitated transport membranes is given discussing the several existing mechanisms as well as membrane materials investigated in the last years.

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