Category: 13031-04-4

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Synthesis of dihydro-2,3-furandiones from diethyl oxalate and aldehydes through the action of sodium methoxide

Dihydro-4,4-dimethyl-2,3-furandione (4e) was synthesized from diethyl oxalate, methylpropanal (1a) and formaldehyde in the presence of sodium methoxide. In a similar manner, analogs of dihydro-2,3-furandione 4 were prepared using other aldehydes.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 13031-04-4, name is 4,4-Dimethyldihydrofuran-2,3-dione, introducing its new discovery. name: 4,4-Dimethyldihydrofuran-2,3-dione

Inversion of enantioselectivity in the hydrogenation of ketopantolactone on platinum modified by ether derivatives of cinchonidine

Asymmetric hydrogenation of ketopantolactone was studied on a 5 wt% Pt/Al2O3 catalyst in the presence of cinchonidine and its O-methyl, -ethyl, -phenyl and -trimethylsilyl derivatives. Inversion of enantioselectivity with the latter two bulky substituents proved that in the enantiodifferentiating step cinchonidine adsorbs via the quinoline ring lying approximately parallel to the Pt surface. The striking nonlinear effect observed with cinchonidine-O-phenyl-cinchonidine mixtures is attributed to differences in the adsorption strength and geometry of the modifiers.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, belongs to tetrahydrofurans compound, is a common compound. Application In Synthesis of 4,4-Dimethyldihydrofuran-2,3-dioneIn an article, once mentioned the new application about 13031-04-4.

Chiral dipyridylphosphine ligand P-Phos was used in the Ru catalyzed asymmetric hydrogenation of alpha- and beta-keto esters in room temperature ionic liquids (RTILs) with high conversions and good to excellent enantioselectivities. The catalyst was recycled by simple extraction and reused five times without loss of activity and enantioselectivity.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Synthetic Route of 13031-04-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, molecular formula is C6H8O3. In a Article，once mentioned of 13031-04-4

Continuous enantioselective hydrogenation of activated ketones

Heterogeneous enantioselective hydrogenation of activated ketones in a fixed-bed reactor was achieved by continuous feeding of minute amounts of chiral modifier to the reactant stream. The potential of this concept is illustrated using the hydrogenation of ketopantolactone and ethyl pyruvate over Pt/alumina modified by cinchonidine. Production rates and enantiomeric excesses (ee) achieved without optimization at room temperature and 40 bar were 94 mmol/gcat·h and 83.4% ee for ketopantolactone, and 23 mmol/gcat·h and 89.9% ee for ethyl pyruvate. Transient measurements by stopping of the cinchonidine flux indicate that continuous feeding of the modifier in ppm concentration is essential.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Reference of 13031-04-4, 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. 13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, molecular formula is C6H8O3. In a Article，once mentioned of 13031-04-4

Determination of Enantiomeric Excess and Degree of Hydrogenation in the Enantioselective Hydrogenation of Ketopantolactone

A new gas chromatographic method for the simultaneous determination of the degree of hydrogenation of ketopantolactone and the enantiomeric excess of pantolactone does not require any derivatisation. Keywords.Ketopantolactone; Enantioselective hydrogenation; Catalyses with phospines; Gaschromatography on Chirasil-L-Val

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Related Products of 13031-04-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, molecular formula is C6H8O3. In a Article，once mentioned of 13031-04-4

A practical RuCl3-catalyzed oxidation using trichlproisocyanuric acid as a stoichiometric oxidant under mild nonacidic conditions

The combined use of catalytic RuCl3 (1.0 mol %) and stoichiometric trichloroisocyanuric acid (TCCA; 1.0 equiv) in the presence of n-Bu4NBr (2.0 mol %) and K2CO3 (3.0 equiv) in 1:1 MeCN/H2O at 25-45C allows smooth oxidation of primary alcohols to carboxylic acids. Secondary alcohols can be oxidized to ketones when using the same set of the reagents in 1:1 MeCN/ H2O or 1:1 AcOEt/H2O. By proceeding under the nonacidic biphasic conditions dispensing with hazardous reagents, the oxidation reactions are applicable to structurally diverse alcohols, easy to work up, environmentally benign, and basically high-yielding.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 13031-04-4, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 13031-04-4

Process for the oxidation of alcohols

A process for oxidizing primary and secondary alcohols to the corresponding aldehydes and ketones is disclosed. The oxidation is carried out by reacting the primary or secondary alcohol with an organic N-chloro compound oxidizing agent in the presence of a catalyst of the formula: STR1 wherein the substituent groups are as defined in the specification.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Reference of 13031-04-4, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, molecular formula is C6H8O3. In a article，once mentioned of 13031-04-4

Porous Aerogels from Shape-Controlled Metal Nanoparticles Directly from Nonpolar Colloidal Solution

Porous architectures of noble metal nanocrystals are promising for many catalytic as well as for fuel cell applications. Here we present the synthesis of porous, extremely lightweight aerogels of self-supported Pt nanocubes and nanospheres by direct destabilization from nonpolar colloidal solution using hydrazine monohydrate (N2H4·H2O) as gelation reagent. The template-free voluminous lyogels of the Pt nanocrystals are converted to macroscopic solid aerogel monoliths by supercritical drying. The aerogels from Pt nanocubes mostly exhibit (100) as the exposed crystal facets throughout the entire monolithic surface, while the aerogels from quasi-spherical Pt nanocrystals exhibit many crystal facets such as (111) and (100). Furthermore, the aerogels exhibit remarkably low densities of ?0.19 g cm-3 ± 0.038 g cm-3 (?0.9% of bulk Pt) and a specific surface area in the range of ?6400-7000 m2 mol-1. The nanocube gels show better catalytic performance than the nanosphere gels when employed for asymmetric hydrogenation reaction, which is exemplarily shown for 4,4-dimethyldihydrofuran-2,3-dione to d-/l-pantolactone conversion with an excess of 9% for the d-enantiomer. Owing to their high specific surface area and certain type of exposed crystal facets, Pt aerogels developed here are highly promising for possible future applications in facet selective catalytic reactions.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Reference of 13031-04-4, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.13031-04-4, Name is 4,4-Dimethyldihydrofuran-2,3-dione, molecular formula is C6H8O3. In a article£¬once mentioned of 13031-04-4

A thermoregulated phase-separable chiral Pt nanocatalyst for recyclable asymmetric hydrogenation of alpha-ketoesters

The design and preparation of a chiral Pt nanocatalyst system possessing thermoregulated phase-separation property and its application in recyclable asymmetric hydrogenation of alpha-ketoesters are presented.

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Reference£º
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Product Details of 13031-04-4, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 13031-04-4, name is 4,4-Dimethyldihydrofuran-2,3-dione. In an article£¬Which mentioned a new discovery about 13031-04-4

Role of guiding groups in cinchona-modified platinum for controlling the sense of enantiodifferentiation in the hydrogenation of ketones

Systematic structural variations of cinchona-type modifiers used in the platinum-catalyzed hydrogenation of ketones give insight into the adsorption mode of the modifier and its interaction with the substrate on the platinum surface under truly in situ conditions. The performance of a new modifier, O-(2-pyridyl)-cinchonidine, is compared to that of O-phenyl-cinchonidine and cinchonidine (CD). In the hydrogenation of ethyl pyruvate, ketopantolactone, and 2-methoxyacetophenone, CD gives the (R)-alcohol in excess. Introduction of the bulky O-phenyl group favors the (S)-enantiomer, whereas upon replacement of the phenyl by a 2-pyridyl group the (R)-alcohol is again the major product. This finding is particularly striking, because the two ether groups have virtually identical van der Waals volumes. A catalytic study including the nonlinear behavior of modifier mixtures, and attenuated total reflection infrared spectroscopy of the solid-liquid interface in the presence of hydrogen, revealed the adsorption mode and strength of the modifiers on Pt. Theoretical calculations of the modifier-substrate interactions offered a feasible explanation for the different role of the bulky ether groups: repulsion by the phenoxy and attraction by the 2-pyridoxy groups. Simulation of the interaction of o-pyridoxy-CD with ketopantolactone on a model Pt surface suggests that formation of two N-H-O-type H-bonds-involving the quinuclidine and pyridine N atoms, and the two keto-carbonyls in the substrate-controls the adsorption of the substrate during hydrogen uptake. This mechanistic study demonstrates the potential of insertion of suitable substituents into CD and their influence on adsorption and stereocontrol on the platinum surface.

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Reference£º
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem