Day: April 6, 2022

Rezaei, Golbon; Meloni, Giovanni published the article 《Study of the Synchrotron Photoionization Oxidation of Alpha-Angelica Lactone (AAL) Initiated by O(3P) at 298, 550, and 700 K》. Keywords: alpha angelica lactone synchrotron photoionization oxidation radiation; biofuel; multiplexed mass spectrometry; oxidation; reaction pathways; synchrotron photoionization.They researched the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8 ).Product Details of 591-12-8. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:591-12-8) here.

In recent years, biofuels have been receiving significant attention because of their potential for decreasing carbon emissions and providing a long-term renewable solution to unsustainable fossil fuels. Currently, lactones are some of the alternatives being produced. Many lactones occur in a range of natural substances and have many advantages over bioethanol. In this study, the oxidation of alpha-angelica lactone initiated by ground-state at. oxygen, O(3P), was studied at 298, 550, and 700 K using synchrotron radiation coupled with multiplexed photoionization mass spectrometry at the Lawrence Berkeley National Lab (LBNL). Photoionization spectra and kinetic time traces were measured to identify the primary products. Ketene, acetaldehyde, Me vinyl ketone, methylglyoxal, di-Me glyoxal, and 5-methyl-2,4-furandione were characterized as major reaction products, with ketene being the most abundant at all three temperatures Possible reaction pathways for the formation of the observed primary products were computed using the CBS-QB3 composite method.

If you want to learn more about this compound(5-Methylfuran-2(3H)-one)Product Details of 591-12-8, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Quality Control of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, is researched, Molecular C8H12ClNO2, CAS is 148-51-6, about Correlation between protein function and ligand binding profiles. Author is Shortridge, Matthew D.; Bokemper, Michael; Copeland, Jennifer C.; Stark, Jaime L.; Powers, Robert.

The authors report that proteins with the same function bind the same set of small mols. from a standardized chem. library. This observation led to a quantifiable and rapidly adaptable method for protein functional anal. using exptl. derived ligand binding profiles. Ligand binding is measured using a high-throughput NMR ligand affinity screen with a structurally diverse chem. library. The method was demonstrated using a set of 19 proteins with a range of functions. A statistically significant similarity in ligand binding profiles was only observed between the two functionally identical albumins and between the five functionally similar amylases. This new approach is independent of sequence, structure, or evolutionary information and, therefore, extends the ability to analyze and functionally annotate novel genes.

If you want to learn more about this compound(5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride)Quality Control of 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(148-51-6).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

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 Humins with Efficient Electromagnetic Wave Absorption: A By-Product of Furfural Conversion to Isopropyl Levulinate via a Tandem Catalytic Reaction in One-Pot, published in 2021-09-01, which mentions a compound: 591-12-8, mainly applied to humin electromagnetic wave absorption furfural isopropyl levulinate tandem catalysis; biomass conversion; by-product; catalysis; electromagnetic wave absorption; nano-porous carbon, Formula: C5H6O2.

Both one-pot catalytic conversion of furfural (FAL) to iso-Pr levulinate (PL) and carbonization of byproduct (humins) for electromagnetic wave absorption are discussed, which provides inspiration that humins can be applied to electromagnetic wave absorption. In the former, phosphotungstic acid (PW) is employed as a homogeneous catalyst to convert FAL to PL via a tandem reaction in one pot, with the formation of a vast amount of humins. With FAL and various intermediates as substrates, it was found that humins was a polymerization product of FAL, furfuryl alc. (FOL) and furfuryl ester (FE) with furan rings. In addition, the in situ attenuated total reflection IR (ATR-IR) spectra also provided a basis for the proposed reaction route. In the latter, with the humins as raw material, P species and WO3 doped nano-porous carbon (Humins-700) platform formed after high-temperature annealing is used for electromagnetic wave absorption and manifests desirable absorption performance. The min. reflection loss (RLmin) value is -47.3 dB at 13.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth reaches 4.5 GHz (11.2-5.7 GHz).

If you want to learn more about this compound(5-Methylfuran-2(3H)-one)Formula: C5H6O2, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Reference of 2-Bromo-3-methoxypropanoic acid. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 2-Bromo-3-methoxypropanoic acid, is researched, Molecular C4H7BrO3, CAS is 65090-78-0, about Tailored Synthesis of Skeletally Diverse Stemona Alkaloids through Chemoselective Dyotropic Rearrangements of β-Lactones.

The collective synthesis of skeletally diverse Stemona alkaloids featuring tailored dyotropic rearrangements of β-lactones as key elements is described. Specifically, three typical 5/7/5 tricyclic skeletons associated with stemoamide, tuberostemospiroline and parvistemonine were first accessed through chemoselective dyotropic rearrangements of β-lactones involving alkyl, hydrogen, and aryl migration, resp. By the rational manipulation of substrate structures and reaction conditions, these dyotropic rearrangements proceeded with excellent efficiency, good chemoselectivity and high stereospecificity. Furthermore, several polycyclic Stemona alkaloids, including saxorumamide, isosaxorumamide, stemonine and bisdehydroneostemoninine (I – IV, resp.), were obtained from the aforementioned tricyclic skeletons through late-stage derivatizations. A novel visible-light photoredox-catalyzed formal [3+2] cycloaddition was also developed, which offers a valuable tool for accessing oxaspirobutenolide and related scaffolds.

If you want to learn more about this compound(2-Bromo-3-methoxypropanoic acid)Reference of 2-Bromo-3-methoxypropanoic acid, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(65090-78-0).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Synthetic Route of C5H14Cl2N2. 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: Piperidin-4-amine dihydrochloride, is researched, Molecular C5H14Cl2N2, CAS is 35621-01-3, about Putrescine or spermidine binding site of aminopropyltransferases and competitive inhibitors. Author is Shirahata, Akira; Morohohi, Toru; Fukai, Masayo; Akatsu, Sakae; Samejima, Keijiro.

A model of the active site of aminopropyltransferases was proposed based on the study of a number of monoamino and diamino compounds as potential inhibitors and substrates, resp., of spermidine synthase purified from pig liver. The active site seems to have a relatively large hydrophobic cavity adjacent to a neg. charged site, to which a protonated amino group of putrescine binds, with another amino group of putrescine being situated in the hydrophobic cavity as a free form to be aminopropylated by decarboxylated S-adenosylmethionine. On the basis of the above-mentioned model, another modified one was proposed for spermine synthase, and several compounds designed according to the modified model were found to potently inhibit spermine synthase, purified from rat brain, in competition with spermidine. The newly developed inhibitors were about two orders of magnitude more potent in vitro than a known inhibitor of spermine synthase, dimethyl(5′-adenosyl)sulfonium perchlorate.

If you want to learn more about this compound(Piperidin-4-amine dihydrochloride)Synthetic Route of C5H14Cl2N2, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(35621-01-3).

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis of 4-aminopiperidine》. Authors are Yakhontov, L. N.; Yatsenko, S. V.; Rubtsov, M. V..The article about the compound:Piperidin-4-amine dihydrochloridecas:35621-01-3,SMILESS:NC1CCNCC1.[H]Cl.[H]Cl).Related Products of 35621-01-3. Through the article, more information about this compound (cas:35621-01-3) is conveyed.

Hydrogenation of 4-aminopyridine in alc. HCl over Pt at room temperature and 80 atm. H gave 16.5% 4-aminopiperidine-2HCl (I), m. 331-3° (picrate m. 245°). Hydrogenation of isonicotinic hydrazide in 4% HCl over Pt at room temperature gave 76% isonipecotinic hydrazide-2HCl, m. 240-2°. This treated with NaNO2 at -5°, then concentrated, and the resulting precipitate extracted with hot EtOH gave after refluxing 6 hrs. further with concentrated HCl 35% 4-aminopiperidine, isolated as HCl salt identical with the above. Hydrogenation of isonicotinic acid-HCl in 4% HCl over Pt gave isonipecotinic acid-HCl, decompose 299°, which treated with NaN3 in the presence of H2SO4 in C6H6 at 40° gave after aqueous treatment with NaOH 66% 4-aminopiperidine, isolated as HCl salt. Isonipecotinic acid HCl salt (II) and HN3 in H2SO4 and C6H6 gave at 80° 62% 4-aminopiperidine HCl salt. Refluxing II with NaO2CH and HCO2H 3 hrs. gave 44% 1-formylisonipecotinic acid, m. 136-38°. Heating I with HCO2Na in HCONH2 7 hrs. gave after aqueous treatment 62.5% 1-formyl-4-formamidopiperidine, m. 77-9°.

If you want to learn more about this compound(Piperidin-4-amine dihydrochloride)Related Products of 35621-01-3, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(35621-01-3).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

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 Study of the Synchrotron Photoionization Oxidation of Alpha-Angelica Lactone (AAL) Initiated by O(3P) at 298, 550, and 700 K, published in 2021, which mentions a compound: 591-12-8, mainly applied to alpha angelica lactone synchrotron photoionization oxidation radiation; biofuel; multiplexed mass spectrometry; oxidation; reaction pathways; synchrotron photoionization, COA of Formula: C5H6O2.

In recent years, biofuels have been receiving significant attention because of their potential for decreasing carbon emissions and providing a long-term renewable solution to unsustainable fossil fuels. Currently, lactones are some of the alternatives being produced. Many lactones occur in a range of natural substances and have many advantages over bioethanol. In this study, the oxidation of alpha-angelica lactone initiated by ground-state at. oxygen, O(3P), was studied at 298, 550, and 700 K using synchrotron radiation coupled with multiplexed photoionization mass spectrometry at the Lawrence Berkeley National Lab (LBNL). Photoionization spectra and kinetic time traces were measured to identify the primary products. Ketene, acetaldehyde, Me vinyl ketone, methylglyoxal, di-Me glyoxal, and 5-methyl-2,4-furandione were characterized as major reaction products, with ketene being the most abundant at all three temperatures Possible reaction pathways for the formation of the observed primary products were computed using the CBS-QB3 composite method.

If you want to learn more about this compound(5-Methylfuran-2(3H)-one)COA of Formula: C5H6O2, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 276684-04-9, is researched, Molecular C10H6Cl2N2O2, about Utility of β-(3,4-dichlorobenzoyl)-α-(phenylthio)propionic acid in heterocyclic synthesis, the main research direction is dichlorobenzoylphenylthiopropionic acid preparation reaction nucleophile.Recommanded Product: 276684-04-9.

β-(3,4-Dichlorobenzoyl)-α-(phenylthio)propionic acid (I) was prepared via the treatment of β-(3,4-dichlorobenzoyl)acrylic acid (II) with thiophenol in dry benzene. The reactivity of I and II with different nucleophilic reagents was investigated; the mass spectra of some products are discussed.

If you want to learn more about this compound(5-(3,4-Dichlorophenyl)-1H-pyrazole-3-carboxylic acid)Recommanded Product: 276684-04-9, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(276684-04-9).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Name: 5-Methylfuran-2(3H)-one. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Catalytic co-pyrolysis of seaweeds and cellulose using mixed ZSM-5 and MCM-41 for enhanced crude bio-oil production.

Catalytic co-pyrolysis of seaweed Enteromorpha clathrata (EN) and cellulose (CEL) with catalysts ZSM-5 and MCM-41 was investigated by TG, Py-GC/MS and fixed-bed experiments The effects of temperature, catalysts, seaweed and cellulose ratio were examined on product yields distribution and bio-oil compositions by catalytic co-pyrolysis. The maximum bio-oil yield was recorded at the ratio of 1:1 (EN and CEL) with ZSM-5/MCM-41 at 500°C on co-pyrolytic process. The interaction of radicals and faster heat transfer rate of EN/CEL induces the synergistic effects with catalysts. The advantage of mesoporous mol. sieve along with acidic microporous zeolite of ZSM-5/MCM-41 improved the cracking, dehydration, decarbonylation, decarboxylation, dealkylation, aromatization, oligomerization and deamination reactions. The overall study revealed that the amount of N-containing compounds were decreased and significantly elevated bio-oil production with increased furans and aromatics

If you want to learn more about this compound(5-Methylfuran-2(3H)-one)Name: 5-Methylfuran-2(3H)-one, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 591-12-8, is researched, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2Journal, Journal of Catalysis called Investigation of solvent effects in the hydrodeoxygenation of levulinic acid to γ-valerolactone over Ru catalysts, Author is Mamun, Osman; Saleheen, Mohammad; Bond, Jesse Q.; Heyden, Andreas, the main research direction is levulinic acid hydrodeoxygenation valerolactone ruthenium catalyst solvent effect.Reference of 5-Methylfuran-2(3H)-one.

Liquid phase, reductive deoxygenation of biomass derived platform chems. over transition metal surfaces constitutes an efficient scheme for upgrading lignocellulosic biomass. The solvation effects on the reaction kinetics of the hydrodeoxygenation (HDO) of levulinic acid (LA) towards the formation of γ-valerolactone (GVL) over Ru(0 0 0 1) has been studied in three condensed phase media, i.e., liquid water, methanol, and 1,4-dioxane. Detailed microkinetic models have been developed incorporating various catalytic pathways including formation of 4-hydroxypentanoic acid (HPA) and α-angelicalactone (AGL) to simulate the catalytic activity of Ru(0 0 0 1) under various reaction conditions of solvent, temperature, and partial pressures. Our microkinetic models suggest that direct catalytic conversion with alkoxy formation is the preferred reaction mechanism in all reaction environments. Furthermore, we find that water facilitates the reaction kinetics significantly and that the solvent effect is strongest at lower temperatures (T < 373 K). Here, rate increases due to liquid water solvation effects of 2-4 orders of magnitude are observed All solvents increase the rate of reaction relative to the gas phase; however, solvation effects decrease with decrease in polarity. 1,4-dioxane increases the rate only minimally due to competitive adsorption of the solvent mols. despite facilitating the partially rate controlling step of the LA hydrogenation to an alkoxy intermediate. If you want to learn more about this compound(5-Methylfuran-2(3H)-one)Reference of 5-Methylfuran-2(3H)-one, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia