Category: 627-93-0

Zhang, Ziyang published the artcileTi³⁺ Tuning the Ratio of Cu⁺/Cu⁰ in the Ultrafine Cu Nanoparticles for Boosting the Hydrogenation Reaction, SDS of cas: 627-93-0, the publication is Small (2021), 17(23), 2008052, database is CAplus and MEDLINE.

Hydrogenation of diesters to diols is a vital process for chem. industry. The inexpensive Cu⁺/Cu⁰-based catalysts are highly active for the hydrogenation of esters, however, how to efficiently tune the ratio of Cu⁺/Cu⁰ and stabilize the Cu⁺ is a great challenge. In this work, it is demonstrated that doped Ti ions can tune the ratio of Cu⁺/Cu⁰ and stabilize the Cu⁺ by the Ti-O-Cu bonds in Ti-doped SiO₂ supported Cu nanoparticle (Cu/Ti-SiO₂) catalysts for the high conversion of di-Me adipate to 1,6-hexanediol. In the synthesis of the catalysts, the Ti⁴⁺-O-Cu²⁺ bonds promote the reduction of Cu²⁺ to Cu⁺ by forming Ti³⁺-O_V-Cu⁺ (O_V: oxygen vacancy) bonds and the amount of Ti doping can tune the ratio of Cu⁺/Cu⁰. In the catalytic reaction, the O vacancy activates C-O in the ester by forming new Ti^3+δ-O_R-Cu^1+δ bonds (O_R: reactant oxygen), and Cu⁰ activates hydrogen. After the products are desorbed, the Ti^3+δ-O_R-Cu^1+δ bonds return to the initial state of Ti³⁺$-O_V-Cu⁺ bonds. The reversible Ti-O-Cu bonds greatly improve the activity and stability of the Cu/Ti-SiO₂ catalysts. When the content of Ti is controlled at 0.4 wt%, the conversion and selectivity can reach 100% and 98.8%, resp., and remain stable for 260 h without performance degradation

Small published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C9H9ClN2, SDS of cas: 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Yang, Xingchuan published the artcileLiquid-Liquid Equilibrium Measurement and Correlation for the Ternary Systems (Dimethyl Succinate + 1,4-Butanediol)/(Dimethyl Glutarate + 1,5-Pentanediol)/(Dimethyl Adipate + 1,6-Hexanediol) + Water at Different Temperatures, Recommanded Product: Dimethyl adipate, the publication is Journal of Chemical & Engineering Data (2020), 65(4), 1875-1885, database is CAplus.

Liquid-liquid equilibrium (LLE) data for esters + diols + water ternary systems were measured at 101.3 kPa at four different temperatures, namely, 293.15, 303.15, 313.15, and 323.15 K. The Othmer-Tobias equation and the Hand equation were applied to examine the reliability of the LLE data in which both regression coefficients were higher than 0.98. The calculated distribution coefficients and separation factors were larger than 1, which means that it is feasible to extract the diols from the corresponding ester with water. In addition, NRTL and UNIQUAC models were applied to correlate the exptl. data, and the binary interaction parameters were obtained. The calculated root-mean-square deviation values show that both models are in good agreement with the exptl. data.

Journal of Chemical & Engineering Data published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C22H32O2, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Pellis, Alessandro published the artcileEnzymatic synthesis of biobased polyesters utilizing aromatic diols as the rigid component, Computed Properties of 627-93-0, the publication is European Polymer Journal (2020), 109680, database is CAplus.

In the present work, the biocatalyzed synthesis of a series of aromatic-aliphatic polyesters based on the aliphatic diesters di-Me succinate, di-Me adipate and di-Me sebacate and the aromatic diols 2,5-bis(hydroxymethyl)furan, 3,4-bis(hydroxymethyl)furan and 2,6-pyridinedimethanol were investigated. A similar series of polyesters based on the petroleum-based 1,3-benzenedimethanol, 1,4-benzenedimethanol and 1,4-benzenediethanol were also synthesized for comparison. Data show that the enzymic syntheses were successful starting from all diols, with the obtained polymers having isolated yields between 67 and over 90%, number average mol. weights between 3000 Da and 5000 Da and d.p. (DP) of 6-18 (based on the used aliphatic diesters and aromatic diols) when polymerized in di-Ph ether as solvent. Only using 3,4-bis(hydroxymethyl)furan as the diol led to shorter oligomers with isolated yields around 50% and DPs of 3-5. DSC and TGA thermal analyses show clear correlation between polymer crystallinity and aliphatic carbon chain length of the diester.

European Polymer Journal published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Computed Properties of 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xu, Xiao-Feng published the artcileSynthesis of adiponitrile from dimethyl adipate and ammonia in the vapor-phase over niobium oxide, SDS of cas: 627-93-0, the publication is Catalysis Science & Technology (2022), 12(12), 3947-3956, database is CAplus.

An environmentally benign route leading to adiponitrile (ADN), a nylon-6,6 intermediate, was achieved by direct vapor-phase nitrilation of di-Me adipate (DMA) with ammonia (NH₃) in a fixed-bed reactor. The challenges of this reaction include not only inhibiting both intramol. cyclization and the intermol. polycondensation of the electron-withdrawing group functionalized carbon chain but also suppressing the thermolysis of aliphatic DMA and ADN. Both amphoteric oxides and acidic oxides enable the transformation but exhibit different reactivities. Under evaluation conditions, the acidic oxides exhibit moderate to good nitrile selectivity, while the amphoteric oxides exhibit high DMA conversions with relatively low nitrile selectivity. Under the optimized conditions, the desired ADN was obtained with a selectivity of 84.3% with 97.7% DMA conversion over Nb₂O₅-1000 consisting of a monoclinic structure/phase (H-Nb₂O₅). The structure-performance relationship of this catalyst was preliminarily discussed. Furthermore, a tentative reaction pathway consisting of ammonolysis and dehydration processes in a tandem mode was proposed.

Catalysis Science & Technology published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C15H10O2, SDS of cas: 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ding, Guang-Rong published the artcileChemoselective nitrilation of dimethyl adipate with ammonia over carbon encapsulated WO_x catalysts under continuous flow conditions, Name: Dimethyl adipate, the publication is Catalysis Science & Technology (2022), 12(12), 3982-3991, database is CAplus.

Adiponitrile (ADN) is a key intermediate for the industrial production of polyamides represented by nylon 66. In this study, the chemoselective nitrilation of di-Me adipate (DMA) with ammonia (NH₃) under continuous flow conditions was studied on carbon encapsulated oxygen-deficient WO_x<3 catalysts (WO_x@C/C). A combination of dispersed anchor sites at a poly(ionic liquid) (PIL) template, the porosity of active carbon support, and the calcination procedure allows the formation of effective WO_x@C-600-0.25-A1, persisting high BET sp. surface area and WO_2.83 active phase of appropriate size. It delivers ADN and Me 5-cyanopentanoate (MCP) with an excellent selectivity of up to 95.8% at a weight hourly space velocity of DMA (WHSV_DMA) of ∼0.64 g_DMA g_cat^-1 h^-1 and an NH₃/DMA molar ratio of 13 : 1. A tandem reaction route from DMA to ADN via MCP was elucidated, wherein the second nitrilation of MCP to ADN proceeds very slowly. Besides, both C_DMA and TON_ADN/TON_MCP are significantly influenced by the phys. dispersion and size of the active WO_2.83 phase in WO_x@C/C.

Catalysis Science & Technology published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Name: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Li, Yinwen published the artcileCatalytic Transformation of PET and CO₂ into High-Value Chemicals, Application In Synthesis of 627-93-0, the publication is Angewandte Chemie, International Edition (2022), 61(10), e202117205, database is CAplus and MEDLINE.

Polyethylene terephthalate (PET) and CO₂, two chem. wastes that urgently need to be transformed in the environment, are converted simultaneously in a one-pot catalytic process through the synergistic coupling of three reactions: CO₂ hydrogenation, PET methanolysis and di-Me terephthalate (DMT) hydrogenation. More interestingly, the chem. equilibrium of both reactions were shifted forward due to a revealed dual-promotion effect, leading to significantly enhanced PET depolymerization The overall methanol yield from CO₂ hydrogenation exceeded the original thermodn. equilibrium limit since the methanol was in situ consumed in the PET methanolysis. The degradation of PET by a stoichiometric ratio of methanol was significantly enhanced because the primary product, DMT was hydrogenated to di-Me cyclohexanedicarboxylate (DMCD) or p-xylene (PX). This synergistic catalytic process provides an effective way to simultaneously recycle two wastes, polyesters and CO₂, for producing high-value chems.

Angewandte Chemie, International Edition published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Application In Synthesis of 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ning, Lei published the artcileA Reductive Deuteration Approach to the Efficient Synthesis of Deuterated Polymers, Synthetic Route of 627-93-0, the publication is Synlett (2022), 33(8), 771-776, database is CAplus.

Deuterated polymers have wide applications but limited synthetic methods. In this study, we report an efficient two-step approach for the synthesis of deuterated polyesters and polyurethanes. Firstly, two practical single-electron transfer (SET) reductive-deuteration methods have been developed for site-selective introduction of C(sp³)-D into diol monomers. Nine deuterated diol monomers with high deuterium incorporations were synthesized under SmI₂-D₂O and/or Na-EtOD- d₁SET reductive-deuteration conditions. Then, six typical deuterated polyesters and polyurethanes were synthesized using those deuterated monomers under typical polymerization conditions. In all the synthesized polymers, high deuterium incorporation was fully maintained, which showcased the potential application of this approach for the synthesis of polymers with site-specific deuterium labeling.

Synlett published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Synthetic Route of 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhang, Guowen published the artcileDesign and Control for the Dimethyl Adipate Process with a Side-Reactor Column Configuration, Synthetic Route of 627-93-0, the publication is Chemical Engineering & Technology (2021), 44(9), 1716-1725, database is CAplus.

A side-reactor column (SRC) configuration, which integrates vacuum distillation with atm. reaction, was developed for di-Me adipate (DMA) production The sequential optimization method was applied to optimize the design parameters including side stream drawn stage, reactor numbers, and catalyst loading with total annual cost (TAC) as objective function in order to realize the economical design. The best economic performance was achieved as the result of the specific SRC configuration featuring one column with 20 stages where DMA was drawn from the 5th stage and one side-reactor was equipped in the bottom. Moreover, a proportion-temperature cascade control structure was successfully developed which avoids the disturbance of inlet flow rate and composition

Chemical Engineering & Technology published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C16H24BF4Ir, Synthetic Route of 627-93-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Weichao published the artcileDetermining Roles of Cu⁰ in the Chemosynthesis of Diols via Condensed Diester Hydrogenation on Cu/SiO₂ Catalyst, Category: esters-buliding-blocks, the publication is ChemCatChem (2020), 12(15), 3849-3852, database is CAplus.

Copper-based catalyst was applied in the condensed diester hydrogenation with unexpected high selectivity (∼100%) to 1,6-hexanediol. On basis of the mass transfer anal. and kinetics results, the reaction rate of the condensed diester hydrogenation was deduced to be controlled by the activation of hydrogen on Cu⁰ sites, which was further demonstrated by the correlations between the catalytic activity and different copper species. Importantly, this catalysis mechanism is different with that of gas-phase diester hydrogenation, which is generally determined by the adsorption of ester on Cu⁺ species.

ChemCatChem published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H7ClO3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zheng, Qi published the artcileEffect of irradiation on volatile compound profiles and lipid oxidation in chicken powder seasoning, Recommanded Product: Dimethyl adipate, the publication is Radiation Physics and Chemistry (2022), 109851, database is CAplus.

The effects of two types of industrial irradiation sources (10 MeV electron beam (EB) and gamma ray (GR), irradiation at 4 kGy and 7 kGy, resp.) on off-odor, volatile compounds, and lipid oxidation in chicken powder seasoning were studied. Irradiation induced off-odor and lipid oxidation in a dose-dependent manner. EB was better than GR at the same dose, with less off-odor and lower peroxide value (POV) and thiobarbitunic acid reactive substance (TBARS) values. GC/MS anal. revealed the presence of 121 volatile compounds, including 113 in non-irradiated chicken powder seasoning followed by 98 in EB 4 kGy, 91 in EB 7 kGy, 80 in GR 4 kGy, and 76 in GR 7 kGy. Irradiation decreased terpenes and terpenoids, and increased aldehydes/alkenes and induced formation of E-1,8-dodecadiene, which correlated to increasing radiation dose. EB induced higher alkenes, terpenes, and terpenoids as well as lower aldehydes than GR at the same dose. In GR 7 kGy-irradiated chicken powder seasoning, 3-octen-2-one, 3,5-octadien-2-one, hexanal, and hexanoic acid were higher than other irradiation treatments. These results suggest that dose contributes to off-odor intensity, and EB has an advantage over GR for chicken powder seasoning irradiation, with more original volatile compounds, lower off-odor, and less lipid oxidation

Radiation Physics and Chemistry published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C9H12O, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics