Day: April 13, 2022

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Processing of flavor-enhanced oils: optimization and validation of multiple headspace solid-phase microextraction-arrow to quantify pyrazines in the oils, published in 2021, which mentions a compound: 13925-00-3, mainly applied to rapeseed oil flavor pyrazine solid phase microextraction; flavor edible oil; internal standard method; multiple headspace solid-phase microextraction; pyrazine; solid-phase microextraction-arrow, Quality Control of 2-Ethylpyrazine.

An efficient and effective multiple headspace-solid phase microextraction-arrow-gas chromatog.-mass spectrometry (MHS-SPME-arrow-GCMS) anal. protocol is established and used to quantify the flavor compounds in oils. SPME conditions, such as fiber coating, preincubation temperature, extraction temperature, and time were studied. The feasibility was compared between SPME-arrow and the traditional fiber by loading different sample amounts It was found that the SPME-arrow was more suitable for the MHS-SPME. The limit of detection (LODs) and limit of quantitation (LOQs) of pyrazines were in the range of 2-60 ng and 6-180 ng/g oil, resp. The relative standard deviation (RSD) of both intra- and inter-day were lower than 16%. The mean recoveries for spiked pyrazines in rapeseed oil were in the range of 91.6-109.2%. Furthermore, this newly established method of MHS-SPME-arrow was compared with stable isotopes dilution anal. (SIDA) by using [2H6 ]-2-methyl-pyrazine. The results are comparable and indicate this method can be used for edible oil flavor anal.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of Agricultural and Food Chemistry called UV ozonation of paraquat, Author is Kearney, Philip C.; Ruth, John M.; Zeng, Qiang; Mazzocchi, Paul, which mentions a compound: 22468-26-4, SMILESS is O=C(O)C1=NC=CC(O)=C1, Molecular C6H5NO3, Category: chiral-catalyst.

The use of UV irradiation in the presence of O2 or O3 was investigated as a method for degrading paraquat (I) [4685-14-7] prior to soil disposal. A solution of 1500 ppm of formulated I was slowly degraded after 7 h in a unit containing 66 low-pressure Hg vapor lamps with a maximum energy output at 254 nm. Addition of acetone  [67-64-1] as a photosensitizer accelerated the rate of oxidative cleavage of I in laboratory-scale studies. Loss of 14C from [methyl-14C]I was observed in I solutions at 150 ppm, but not at 1500 ppm. Reaction products identified from I were 4-carboxy-1-methylpyridinium ion  [36455-39-7] at 1500 ppm by HPLC, 4-picolinic acid  [55-22-1], hydroxy-4-picolinic acid  [22468-26-4], succinic acid  [110-15-6], N-formylglycine  [2491-15-8], malic acid  [6915-15-7], and oxalic acid  [144-62-7] as their Me3Si derivatives, and 4,4′-bipyridyl in dilute solutions by gas chromatog.-mass spectrometry.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Product Details of 931-40-8. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about A Facile Approach to Develop Rice Husk Derived Green Catalyst for One-pot Synthesis of Glycerol Carbonate from Glycerol. Author is Arora, Shivali; Gosu, Vijayalakshmi; Arun Kumar, U. K.; Subbaramaiah, Verraboina.

The profitability margin of biodiesel production hampering due to surplus amount of glycerol with the low market price. Thus, developing an alternative route highly demanded for the conversion of glycerol into value-added chems. In the present manuscript, green synthesis route was explored by utilizing rice husk derived catalyst. The catalytic properties of the prepared catalyst were investigated by using various characterization techniques. The basic strength of the catalyst was influenced by varying the calcination temperature (200 °C to 500 °C) as well as active metal (cerium) loading (5[n.8198]weight % to 20[n.8198]weight %). The present investigation revealed that 10[n.8198]weight % Ce on Na2SiO3 catalyst calcined at 400 °C exhibited the moderate basic sites of 13.89[n.8198]mmol/g, which showed potential catalytic activity for the transesterification of glycerol to glycerol carbonate under optimum condition: 92 % glycerol carbonate yield and 98 % glycerol conversion. The catalyst stability study revealed that the catalyst could be reused up to four consecutive cycles without an appreciable drop in catalytic activity. The kinetics of the reaction was also studied, and the activation energy was calculated as 23.80[n.8198]kJ/mol.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one(SMILESS: O=C1OCC(CO)O1,cas:931-40-8) is researched.HPLC of Formula: 13925-00-3. The article 《Applicability of Organic Carbonates as Green Solvents for Membrane Preparation》 in relation to this compound, is published in ACS Sustainable Chemistry & Engineering. Let’s take a look at the latest research on this compound (cas:931-40-8).

Common polar aprotic solvents, like N,N-dimethylformamide (DMF), 1,4-dioxane, N,N-dimethylacetamide (DMA) and THF, are excellent for membrane preparation However, due to their toxicity or volatile nature, it would be useful to replace them by “”greener”” solvents for environmental and health reasons. In this work, organic carbonates, obtainable through carbon dioxide fixation, were selected as green solvents to find possible use in membrane preparation Polymer solubility experiments were performed to screen their applicability in the phase inversion process to create porous membrane with appropriate structures and selectivities. Hansen solubility parameters were used to rationalize the solubility results. Membrane morphol. and pore structure were characterized using SEM, while the performance of the membrane was determined by applying a 35 μM aqueous feed solution of rose bengal (RB, MW = 1017 Da) to screen the potential of these polymer/organic carbonate systems toward nanofiltration application.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

HPLC of Formula: 13925-00-3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-Ethylpyrazine, is researched, Molecular C6H8N2, CAS is 13925-00-3, about Influence of under-fermented cocoa mass in chocolate production: Sensory acceptance and volatile profile characterization during the processing. Author is Britto de Andrade, Aurora; Lins da Cruz, Margarida; Antonia de Souza Oliveira, Fernanda; Soares, Sergio Eduardo; Druzian, Janice Izabel; Radomille de Santana, Ligia Regina; Oliveira de Souza, Carolina; da Silva Bispo, Eliete.

Under-fermented cocoa mass (UCM) presents, as well as the fresh cocoa seed, a high content of phenolics compounds For this reason, a chocolate with UCM added to the fermented cocoa mass (FCM) was developed. The sensory quality of chocolate is broadly determined by the composition of volatile compounds resulted from microbial metabolism during fermentation and Maillard reactions, that occur during drying, roasting, and conching. The aim of this work was to investigate the effect of adding UCM (20%-80%) to the FCM on the sensory characteristics of the chocolates produced and their volatile profiles during the process chain. The UCM and FCM were obtained through fermentation (48 h and 144 h, resp.), drying, roasting, and grinding processes. In general, the chocolate samples with a higher content of UCM presented lower scores for flavor acceptance, due to their higher bitterness and astringency. The great acceptance was observed on samples with 80% and 65% of FCM. A total of 55 different volatile compounds were identified by HS-SPME-GC-MS. The PCA analyses showed that the profile of the volatile compounds in the chocolate samples was influenced by the fermentation process, as well as the chocolate quality (flowery, honey, fruit, roasted, and chocolate flavors).

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called α,α-Disubstituted butanolides. Preparation of 2-bromo-2-methylbutanolide. New synthesis for 2-hydroxy-2-methylbutanolide, published in 1973, which mentions a compound: 542-58-5, mainly applied to butanolide bromo hydroxy; malonate chloroethanol cyclization, Reference of 2-Chloroethyl acetate.

Butanolides I (R = CO2Et, H) were obtained by cyclizing NaCMe(CO2Et)2 with ClCH2CH2OH or ClCH2CH2OAc. I (R = CO2Et) was decarboxylated in boiling 3N HCl. I (R = H) was brominated with PBr3 and the I (R = Br) hydrolyzed to I (R = OH).

Compounds in my other articles are similar to this one(2-Chloroethyl acetate)Reference of 2-Chloroethyl acetate, you can compare them to see their pros and cons in some ways,such as convenient, effective and so on.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Progress of catalytic valorization of bio-glycerol with urea into glycerol carbonate as a monomer for polymeric materials》. Authors are Zhang, Heng; Li, Hu; Wang, Anping; Xu, Chunbao; Yang, Song.The article about the compound:4-(Hydroxymethyl)-1,3-dioxolan-2-onecas:931-40-8,SMILESS:O=C1OCC(CO)O1).Electric Literature of C4H6O4. Through the article, more information about this compound (cas:931-40-8) is conveyed.

A review. Versatile polymers with highly adjustable characteristics and a broad range of applications are possibly developed owing to the contemporary industrial polymerization techniques. However, industrial production of large amounts of chems. and polymers heavily depends on petroleum resources which are dwindling and unsustainable. Of particular interest is to utilize sustainable and green resources for the manufacture of polymeric materials. The efficient transformation of bio-glycerol to the relevant functional derivatives are being widely investigated owing to the increasing demand for enhancing the value of glycerol manufactured by biodiesel and oleochem. industries. With respect to glycerol-based polymer chem. and technol., considering the economy and environmental benefits, using effective catalysts for the selective transformation of bio-glycerol and urea into glycerol carbonate (GC) as a polymer monomer is of great significance. In this review, recent studies on GC synthesis involving the catalysts such as zinc, magnesium, tungsten, ionic liquid-based catalysts, reaction conditions, and possible pathways are primarily described. Some critical issues and challenges with respect to the rational development of heterogeneous catalytic materials like well-balanced acid-base sites are also illustrated.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 2-Ethylpyrazine( cas:13925-00-3 ) is researched.Category: chiral-catalyst.Procida, Giuseppe; Lagazio, Corrado; Cateni, Francesca; Zacchigna, Marina; Cichelli, Angelo published the article 《Characterization of Arabica and Robusta volatile coffees composition by reverse carrier gas headspace gas chromatography-mass spectrometry based on a statistical approach》 about this compound( cas:13925-00-3 ) in Food Science and Biotechnology. Keywords: Coffea volatile compoundd chem composition gas chromatog mass spectrometry; Arabica and Robusta coffee; Dynamic head space; GC–MS; Green and roasted coffee; Volatile compound. Let’s learn more about this compound (cas:13925-00-3).

Nineteen samples of Arabica and 14 of Robusta coming from various plantation were analyzed by dynamic headspace capillary gas chromatog.-mass spectrometry to characterize the volatile fraction of green and roasted samples and the relationships of the same species with geog. origin. As concerns green beans, Arabica species appear characterized by high content of n-hexanol, furfural and amylformate, while Robusta species by greater content of ethylpyrazine, dimethylsulfone and 2-heptanone. Four variables, 4-methyl-2,3-dihydrofuran, n-hexanol, limonene and nonanal, appear involved in the characterization of the geog. origin of the analyzed samples. The volatile fraction of the roasted Arabica samples, appear characterized by high content of pyridine, diacetyl, propylformate, acetone and 2,3-pentanedione, while Robusta samples by high content of methylbutyrate, 2,3-dimethylpyrazine and 3-hexanone. Considering geog. origin of the analyzed samples, four compounds appear involved, in particular 2-butanone, methylbutyrate, methanol and ethylformate. Very accurate (error rate lower than 5%) rules to classify samples as Arabica or Robusta according to their compounds profile were developed.

In some applications, this compound(13925-00-3)Category: chiral-catalyst is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

Product Details of 10466-61-2. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: H-Leu-NH2.HCl, is researched, Molecular C6H15ClN2O, CAS is 10466-61-2, about Preparation of peptides using surfactant-coated enzymes in supercritical carbon dioxide. Author is Mishima, Kenji; Matsuyama, Kiyoshi.

Preparation of peptides using surfactant-coated enzymes in supercritical carbon dioxide was studied. Surfactant-coated enzymes were prepared by W/O emulsion method. Synthesized peptides were determined by HPLC and UV. Reaction rate of peptide synthesis was increased more than 100 times when used surfactant-coated enzymes in supercritical carbon dioxides than in organic solvents. Enzyme activity was increased when water was added moderately.

In some applications, this compound(10466-61-2)Product Details of 10466-61-2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 2-Chloroethyl acetate, is researched, Molecular C4H7ClO2, CAS is 542-58-5, about Synthesis, characterization, theoretical studies and bioactivity of Co(II), Ni(II), Cu(II), Pd(II), Pt(IV) and Cd(II) complexes with bidentate 3-{[(Z)-1H-pyrrol-3-ylmethylidene]amino}-2-thioxoimidazolidin-4-one, the main research direction is pyrrolylmethylideneamino thioxoimidazolidinone preparation transition metal complexation; transition metal pyrrolylmethylideneamino thioxoimidazolidinone complex preparation antibacterial antifungal; mol structure calculation transition metal pyrrolylmethylideneamino thioxoimidazolidinone complex.Formula: C4H7ClO2.

Chelation complexes of Co(II), Ni(II), Cu(II), Pd(II), Pt(IV) and Cd(II) were synthesized with new heterocyclic ligand [3-{[(Z)-1H-pyrrol-3-ylmethylidene]amino}-2-thioxoimidazolidin-4-one]. This ligand was characterized by C,H,N,S anal., FTIR, UV-Vis, 1H NMR, 13C NMR and mass spectral anal.,the synthesized complexes were identified and their geometrical were suggested in solid state by using (FT-IR) and (UV-Vis) spectroscopy, elemental anal. (C.H.N.S), flame at. absorption technique, in addition to magnetic susceptibility and conductivity measurements. Hyperchem-8 program has been used to predict structural geometries of ligand and their metal complexes. The electrostatic potential (Ep) of the ligand was calculated, furthermore the heat of formation (ΔHf), binding energy (ΔEb), vibration spectra and bond length for the ligand and its metal complexes were calculated by PM3 methods. The antimicrobial activity of the ligand and its complexes has been extensively studied in microorganisms such as Escherichia coli and Staphylococcus aureus and fungi Candida albicans and Aspergillus flavus.

In some applications, this compound(542-58-5)Formula: C4H7ClO2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare