Day: April 15, 2022

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Vitamin B6. II. Reactions and derivatives》. Authors are Harris, Stanton A..The article about the compound:5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloridecas:148-51-6,SMILESS:OC1=C(C)C(CO)=CN=C1C.[H]Cl).Name: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride. Through the article, more information about this compound (cas:148-51-6) is conveyed.

Vitamin B6-HCl (I) in an equal mixture of C5H5N and Ac2O, allowed to stand overnight and then heated on a steam bath for 20 min., gives vitamin B6 triacetate-HCl [2-methyl-3-acetoxy-4,5-bis(acetoxymethyl)-pyridine-HCl], m. 157°; it is stable in 0.01 N HCl but is slowly hydrolyzed in 0.01 N alkali at 37°. Vitamin B6 dibromide-HBr (II) and 3 equivalents AcOAg in a 22% solution of AcOK in AcOH, heated on the steam bath for 0.5 hrs., give 25% of vitamin B6 diacetate-HCl [2-methyl-3-hydroxy-4,5-bis(acetoxymethyl) pyridine-HCl], m. 160-1°; the aqueous solution gives a good FeCl3 test; it has the same relative stability as the tri-Ac derivative Reduction of II with a PdBaSO4 catalyst in EtOH gives 40% of 2,4,5-trimethyl-3-hydroxypyridine, m. 178°; HCl salt, m. 216°. Catalytic reduction of I with the Adams catalyst gives 2,4-dimethyl-3-hydroxy-5-hydroxymethylpyridine-HCl, m. 267-8°; this is weakly active for the growth and promotion of acid formation by Streptobacterium plantarum, whereas III is inactive. I, exactly neutralized with 1 equivalent of MeONa in MeOH and heated at 125° for 4 hrs., gives a small yield of 2-methyl-3-hydroxy-4-methoxymethyl-5-hydroxymethylpyridine-HCl (III), m. 181°.

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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, LWT–Food Science and Technology called Inhibitory activity of Co-microencapsulation of cell free supernatant from Lactobacillus plantarum with propolis extracts towards fish spoilage bacteria, Author is Kuley, Esmeray; Kuscu, Metanet Muhammet; Durmus, Mustafa; Ucar, Yilmaz, the main research direction is propolis extract microencapsulation fish spoilage bacteria Lactobacillus.Application of 591-12-8.

Antibacterial properties of microencapsulated Lactobacillus plantarum cell-free supernatant (CFS) in combinations with aqueous or ethanolic propolis extract at doses of 1% against fish spoilage bacteria were investigated. Microencapsulated samples contained more than 17 compounds, of which furyl alc., acetic acid, maltol, and 2(5H) furanon were identified as common compounds The effects of microencapsulated CFS from L. plantarum in combination with or without propolis extracts on the fish spoilage bacteria varied according to the bacterial species. Among the fish spoilage bacteria, the highest antimicrobial activity of samples was observed against P. damselae with >15.5 mm inhibition diameter zone. Pure and microencapsulated CFS from L. plantarum showed the lowest antimicrobial effects on P. mirabilis with a corresponding inhibition diameter zone of 8.33 and 8.00 mm. Microencapsulated CFS from L. plantarum in combination with aqueous propolis extract had 25 mg/mL of MIC and 50 mg/mL of MBC on all bacteria although the bactericidal effect of microencapsulated samples in combination with ethanolic propolis extract occurred at a level of above 50 mg/mL. The study results revealed that co-microencapsulation of CFS obtained from L. plantarum with propolis extract, especially its aqueous extract, could be potentially used as antimicrobial agents to overcome microbial growth in foods.

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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 Phosphorescence characteristics of several antimetabolites, published in 1969, which mentions a compound: 148-51-6, mainly applied to phosphorescence antimetabolites; antimetabolites phosphorescence, Electric Literature of C8H12ClNO2.

Phosphorescence excitation and emission wavelength peaks, lifetimes, limits of detection, and concentration ranges of anal. usefulness of 37 antimetabolites in rigid (77°K.) ethanolic solution were determined Seventeen of the metabolites produced anal. useful phosphorescence, whereas the remaining 20 were of limited or no anal. use.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride( cas:148-51-6 ) is researched.HPLC of Formula: 148-51-6.Koerner, Wilhelm F.; Nowak, Herbert published the article 《Quantitative determination of the biological antivitamin B6 effect of pyridoxol antagonists》 about this compound( cas:148-51-6 ) in Internationale Zeitschrift fuer Vitaminforschung. Keywords: PYRIDOXOL DEOXY VITAMIN B6; DEOXYPYRIDOXOL VITAMIN B6; ANTIVITAMIN B6 PYRIDOXOLS; VITAMIN B6 PYRIDOXOLS. Let’s learn more about this compound (cas:148-51-6).

Rats were fed a vitamin B6-free diet for 20 days; however, during the last 10 days the diets were supplemented with 30 γ pyridoxol-HCl. During the next 5 days, the animals were loaded with daily oral doses of 200 mg. L-tryptophan/kg., and during days 26-30 of the experiment 4′-deoxypyridoxol-HCl (0.1-100 mg./kg.) was given i.p. 4′-Deoxypyridoxol-HCl had an antivitamin B6 activity (measured by xanthinuric acid excretion) beginning at the 0.3 mg./kg. dose. The antivitamin B6 activity of pyramin-HCl (10-100 mg./kg.) was 60% that of 4′-deoxypyridoxol-HCl.

This literature about this compound(148-51-6)HPLC of Formula: 148-51-6has given us a lot of inspiration, and I hope that the research on this compound(5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Liu, Zhenghui; Yang, Zhenzhen; Wang, Peng; Yu, Xiaoxiao; Wu, Yunyan; Wang, Huan; Liu, Zhimin published an article about the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8,SMILESS:O=C1OC(C)=CC1 ).Formula: C5H6O2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:591-12-8) through the article.

A cobalt-based catalytic system composed of Co(BF4)2·6H2O and ligand P(CH2CH2PPh2)3 was developed for hydrogenation of levulinic acid to γ-valerolactone (GVL), which showed high efficiency for this reaction, affording a GVL yield of 95% under atm. pressure and 100 °C. Co(BF4)2·6H2O combined with P(CH2CH2PPh2)3 is highly efficient for hydrogenation of levulinic acid to γ-valerolactone under atm. pressure.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Synthetic Route of C5H6O2. 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: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Ozonolysis of α-angelica lactone: a renewable route to malonates. Author is DellAcqua, Andrea; Wille, Lukas; Stadler, Bernhard M.; Tin, Sergey; de Vries, Johannes G..

Industrially relevant intermediates such as malonic acid, malonates and 3-oxopropionates waseasily accessed by ozonolysis of α-angelica lactone, derived from the platform chem. levulinic acid. The roles of the solvent and of the quenching conditions were of key importance for the outcome of the reaction.

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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, Safety of 5-Methylfuran-2(3H)-one.

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.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

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 Heterocyclic Chemistry called The synthesis of a series of 7-amino-1-cyclopropyl-8-fluoro-1,4-dihydro-4-oxo-1,6-naphthyridine-3-carboxylic acids as potential antibacterial agents, Author is Sanchez, Joseph P.; Gogliotti, Rocco D., which mentions a compound: 35621-01-3, SMILESS is NC1CCNCC1.[H]Cl.[H]Cl, Molecular C5H14Cl2N2, Product Details of 35621-01-3.

A series of title compounds I [R = 3-aminopyrrolidin-1-yl, 3-(ethylaminomethyl)pyrrolidin-1-yl, 4-aminopiperidin-1-yl, piperazin-1-yl] was prepared and evaluated for antibacterial activity (no data). I were prepared by the displacement of the chloro substituent from I (R = Cl) with the requisite nitrogen nucleophile. The naphthyridine acid was synthesized in ten steps from pyridinecarboxylate II (R1 = OH, R2 = NO2). The key step in the sequence was a Schiemann reaction of II (R1 = Cl, R2 = N2+ PF6-) to give II (R1 = Cl, R2 = F).

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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, Article, Chemical Communications (Cambridge, United Kingdom) called Ozonolysis of α-angelica lactone: a renewable route to malonates, Author is DellAcqua, Andrea; Wille, Lukas; Stadler, Bernhard M.; Tin, Sergey; de Vries, Johannes G., the main research direction is angelica lactone ozone ozonolysis; malonic acid preparation; malonate preparation; oxopropionate preparation.Computed Properties of C5H6O2.

Industrially relevant intermediates such as malonic acid, malonates and 3-oxopropionates waseasily accessed by ozonolysis of α-angelica lactone, derived from the platform chem. levulinic acid. The roles of the solvent and of the quenching conditions were of key importance for the outcome of the reaction.

This literature about this compound(591-12-8)Computed Properties of C5H6O2has given us a lot of inspiration, and I hope that the research on this compound(5-Methylfuran-2(3H)-one) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Wendt, Gerhard; Bernhart, F. W. published the article 《The structure of a sulfur-containing compound with vitamin B6 activity》. Keywords: VITAMIN B 6/chemistry.They researched the compound: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride( cas:148-51-6 ).HPLC of Formula: 148-51-6. 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:148-51-6) here.

Pyridoxal-HCl (0.001 mole) was added to a warm solution of 0.001 mole 2,4-dinitrophenylhydrazine in 40 ml. of 95% EtOH, the mixture gently heated 5 min., after cooling the orange-yellow crystals collected and suspended 3 times in water with stirring (30 min.) (the crystal color changed to red), filtered off, dried, and recrystallized from iso-BuOH to give yellow crystals of 2,4-dinitrophenylhydrazone, m. 256-7°. To 500 mg. diacetate of bis-4-pyridoxyl disulfide (IV) (500 mg.) in 5 ml. 0.1N HCl was added acetone to a slight turbidity. After standing in the cold, 360 mg. crystals of di-HCl salt separated, m. 222°. IV.2HCl (441 mg.) dissolved in 220 ml. H2O, neutralized with 168 mg. NaHCO3, shaken with 2.0 g. Raney Ni catalyst and 3 atm. H 4 hrs. at 25°, the catalyst removed, the combined filtrates concentrated in vacuo in 10 ml., solid NaHCO3 added to pH 8.6, the solution extracted with CHCl3 30 hrs., the extract concentrated to a sirup which was dissolved in EtOH, and alc. HCl added yielded 250 mg. crystals, m. 264-5°. IV.2HCl (500 mg.), 600 mg. Sn foil, and 6 ml. 4N HCl was shaken 20 hrs. at room temperature; after diluting with H2O the Sn removed as sulfide by filtration, the filtrate dried in vacuo, and recrystallized from EtOH gave 250-300 mg. 4-pyridoxyl mercaptan (VI). VI (100 mg. in 25 ml. H2O) was adjusted to pH 8.5 with 2N NH4OH and air passed through the solution until the nitroprusside test was neg. Oxidation was accompanied by the precipitation of the free base of IV in 66% yield, m. 222°. A mixed sample of SB8.2HCl (Berhart, et al., CA 54, 19993c) and IV.2HCl did not depress the m.p. The identity of both compounds was proved by paper chromatography.

This literature about this compound(148-51-6)HPLC of Formula: 148-51-6has given us a lot of inspiration, and I hope that the research on this compound(5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia