Category: 87-91-2

87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, molecular formula is C8H14O6, COA of Formula: C8H14O6, belongs to chiral-catalyst compound, is a common compound. In a patnet, author is Wang, Xiaonan, once mentioned the new application about 87-91-2.

An efficient enantioselective addition of thiols to acyclic trifluoromethyl ketimines has been established by using a bifunctional squaramide catalyst, which was derived from quinine, and the reaction was completed in 5 to 10 min. The construction of chiral tetrasubstituted carbon centers bearing trifluoromethylatedN,S-ketals has been achieved in high yields (up to 96% yield) with excellent enantioselectivities (up to 99% ee).

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Reference:
Chiral Catalysts,
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In an article, author is Huang, Qintong, once mentioned the application of 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, molecular formula is C8H14O6, molecular weight is 206.19, MDL number is MFCD00009143, category is chiral-catalyst. Now introduce a scientific discovery about this category, Safety of (2R,3R)-Diethyl 2,3-dihydroxysuccinate.

ZSM-5 zeolites are commonly used as a heterogeneous catalyst for reactions. Four ZSM-5 catalysts (with various crystallite sizes and a similar ratio of Si/Al) and their ball-milling/surface-poisoning derivates were used to convert L-lactic acid to L, L-lactide. The reaction products were analyzed by three independent analytical methods (i.e., Proton nuclear magnetic resonance (H-1 NMR), high-pressure liquid chromatography (HPLC), and chiral gas chromatography (GC)) for determining the L, L-lactide yield and L-lactic acid conversion. A clear size effect, i.e., smaller catalysts providing better performance, was observed. Further ball-milling/surface-poisoning experiments suggested that the size effect of the ZSM-5 catalysts originated from the diffusion-controlled nature of the reaction under the investigated conditions.

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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare

One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, formurla is C8H14O6. In a document, author is Kelber, Julien B., introducing its new discovery. Computed Properties of C8H14O6.

Tuning the dihedral angle (DA) of axially chiral compounds can impact biological activity, catalyst efficiency, molecular motor performance, or chiroptical properties. Herein, we report gradual, controlled, and reversible changes in molecular conformation of a covalently linked binaphthyl moiety within a 3D polymeric network by application of a macroscopic stretching force. We managed direct observation of DA changes by measuring the circular dichroism signal of an optically pure BINOL-crosslinked elastomer network. Stretching the elastomer resulted in a widening of the DA between naphthyl rings when the BINOL was doubly grafted to the elastomer network; no effect was observed when a single naphthyl ring of the BINOL was grafted to the elastomer network. We have determined that ca. 170 % extension of the elastomers led to the transfer of a mechanical force to the BINOL moiety of 2.5 kcal mol(-1) angstrom(-1)(ca. 175 pN) in magnitude and results in the opening of the DA of BINOL up to 130 degrees.

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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, SMILES is O=C(OCC)[C@H](O)[C@@H](O)C(OCC)=O, in an article , author is Angamuthu, Venkatachalam, once mentioned of 87-91-2, Application In Synthesis of (2R,3R)-Diethyl 2,3-dihydroxysuccinate.

Brucine diol (BD) catalyzed asymmetric Morita-Baylis-Hillman (MBH) reaction is observed for the first time. Brucine N-oxide (BNO) was found to not have an effective chiral catalyst. Faster reaction rate was obtained using unsaturated ester or aromatic aldehydes in the presence of BNO. 4-Nitrobenzaldehyde and alpha,beta-unsaturated ketone/ester were converted to the MBH adduct in moderate yields (up to 74%) with 70% ee value by this catalytic system. The mechanism of BD catalysis is probably initiated by conjugating the vicinal diol of BD to the carbonyl group of the aromatic aldehyde through hydrogen bonding. The tertiary amine of BD acts as a nucleophile to activate vinyl ketone for coupling with the carbonyl of aldehyde through an intramolecular carbonylated reaction. Finally, the breakdown of the complex caused the formation of the MBH adduct (a benzyl-allyl alcohol). The chirality of the benzyl-allyl alcohol is likely affected by the interaction of the bulky asymmetric plane of BD.

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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare

Let¡¯s face it, organic chemistry can seem difficult to learn, Recommanded Product: 87-91-2, Especially from a beginner¡¯s point of view. Like 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, molecular formula is C12H22O12, belongs to tetrahydrofurans compound. In a document, author is Li, Geng, introducing its new discovery.

For efficient enantioseparation, eight organic-inorganic hybrid bead-type chiral packing materials (CPMs) with high organic contents have been developed using cellulose tris(3,5-dimethylphenylcarbamates) bearing small amount of 3-(triethoxysilyl)propyl groups and tetraethyl orthosilicate by a modified Stober process in the basic condition. The hybrid beads could be formed more efficiently in the basic condition without using surfactant, compared to that in the acidic condition. The preparation conditions, including type and amount of catalyst, amount of water and temperature, significantly affected the organic contents and morphology of the hybrid CPMs. Their chiral recognition properties were then examined by high-performance liquid chromatography. The obtained hybrid CPMs with a higher organic content possessed better enantioseparation ability than the traditional CPMs and previous analogue derived from the acidic condition. For some racemates, the hybrid CPMs exhibited even higher enantioselectivity than the commercial Chiralpak IB N, which is one of the most powerful immobilized-type CPMs and prepared from cellulose tris(3,5-dimethylphenylcarbamate). [GRAPHICS] .

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Reference:
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. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, molecular formula is C8H14O6. In an article, author is Martinez-Aguirre, Mayte A.,once mentioned of 87-91-2, Formula: C8H14O6.

Controlling the properties of supramolecular assemblies requires unveiling the specific interactions between their components. In the present work, the catalytic properties and structure of co-assemblies composed of a benzene-1,3,5-tricarboxamide (BTA) ligand coordinated to copper (the soldier) and seven enantiopure BTAs (the sergeants) have been determined. Whatever the sergeant, the enantioselectivity of the reaction is directly proportional to the optical purity of the supramolecular helices. More strikingly, the role played by the sergeant in the co-assembly process differs significantly: from almost pure intercalator (when it is incorporated in the stacks of the soldier and generates long homochiral helices) to pure chain capper (when it leads to the formation of partly helically biased and short assemblies). The former situation leads to optimal enantioselectivity for the catalytic system under study (58 % ee) while the latter situation leads to very low selectivity (8 % ee). The successful rationalization of this high and unexpected difference is crucial for the development of more efficient catalysts and more elaborate supramolecular systems.

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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, SMILES is O=C(OCC)[C@H](O)[C@@H](O)C(OCC)=O, in an article , author is Edelstein, Emma K., once mentioned of 87-91-2, HPLC of Formula: C8H14O6.

An enantio- and diastereoselective Rh-catalyzed conjugate addition reaction for the synthesis of proline analogues is reported. A high-throughput experimentation campaign was used to identify an efficient chiral catalyst which was able to afford the desired products in high yield and with high levels of diastereo- and enantioselectivity. This method was used to afford a range of 3-substituted proline derivatives from readily available dehydroproline electrophiles and boronic acid nucleophiles.

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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Filippini, Giacomo, once mentioned the application of 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, molecular formula is C8H14O6, molecular weight is 206.19, MDL number is MFCD00009143, category is chiral-catalyst. Now introduce a scientific discovery about this category, Product Details of 87-91-2.

Carbon nanodots stand as the missing link between the molecular and the nanoscale world, owing to the unique molecular-like behavior emerging from their synthetic precursors. A converging set of analytical and spectroscopic data yields a precise inventory of the surface reactive groups of amine-rich carbon dots (NCDs-1). As a result, NCDs-1 provide a multi-functional nano-platform that is able to covalently activate carbonyl groups, form iminium-ions and enamine intermediates, and efficiently promote diverse aminocatalytic transformations in water. Remarkably, the catalytic activity of carbon dots can also govern the stereoselectivity in the bond-forming event. Indeed, the use of chiral carbon dots (NCDs-7) as catalysts affords the final aldol products with significant enantiomeric excess. The successful implementation of carbon nanostructures into chemical roles so far restricted to molecular systems opens new avenues for advanced applications where the nanoscale and the molecular realms will merge and complement each other.

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Reference:
Chiral Catalysts,
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Electric Literature of 87-91-2, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, SMILES is O=C(OCC)[C@H](O)[C@@H](O)C(OCC)=O, belongs to chiral-catalyst compound. In a article, author is Chen Danyi, introduce new discover of the category.

A series of chiral phenylbenzothiazole methanol was obtained with up to 99% e.e. value via transfer hydrogenation from phenylbenzothiazolone, with readily available chiral diamine-derived ruthenium complex as a catalyst and sodium formate as a hydrogen source in a mixture of i-PrOH/H2O ( volume ratio 1: 1) under ambient conditions. In addition, the reduction of other aryl N-heteroaryl ketones was also attempted. This method has the advantages of mild rection conditions, readily available and inexpensive catalysts, simple operation.

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Reference:
Chiral Catalysts,
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Electric Literature of 87-91-2, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 87-91-2, Name is (2R,3R)-Diethyl 2,3-dihydroxysuccinate, SMILES is O=C(OCC)[C@H](O)[C@@H](O)C(OCC)=O, belongs to chiral-catalyst compound. In a article, author is Jia, Yihong, introduce new discover of the category.

A series of oligomeric (salen)Mn(III) complexes featuring tartrate linkers were prepared and immobilized over layered double hydroxide, and then used as catalysts for asymmetric epoxidation of unfunctionalized olefins. Comprehensive characterizations including H-1 NMR, FT-IR, UV-Vis, elemental analysis, GPC, and ICP-AES were used to illustrate structures of oligomeric (salen)Mn(III) complexes, while powdered XRD, nitrogen physisorption, together with XPS studies provided further details to detect structures of heterogeneous catalysts. Interestingly, scanning electron microscopy found an interesting morphology change during modification of layered supporting material. Catalytic experiments indicated that configuration of major epoxide products was determined by salen chirality more than that of tartrate linker, but enantioselectivity (e.e. values) could be enhanced when tartrate and salen showed identical chiral configurations. Furthermore, the (R,R)-salen moieties linked with (R,R)-tartrate spacers usually offered higher enantioselectivity compared to other combinations. Lastly, Zn(II)/Al(III) layered double hydroxide played as a rigid supporting material in catalysis, showing positive chiral induction and high recycling potential in catalytic reactions.

Electric Literature of 87-91-2, Because enzymes can increase reaction rates by enormous factors and tend to be very specific, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 87-91-2.

Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare