Day: March 19, 2021

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Cheng, Zhanjun, once mentioned the application of 1722-12-9, Name is 2-Chloropyrimidine, molecular formula is C4H3ClN2, molecular weight is 114.53, MDL number is MFCD00006060, category is pyrimidines. Now introduce a scientific discovery about this category, Quality Control of 2-Chloropyrimidine.

Transformation of nitrogen, sulfur and chlorine during waste tire pyrolysis

The transformation of N/S/Cl during pyrolysis of waste tire were investigated by Thermogravimetry-Mass Spectrum (TG-MS) and flow tube furnace reactor. The pyrolysis of waste tire included four stages, i.e., dehydration below 200 degrees C, decomposition of tire additives at 200-300 degrees C, degradation of natural rubber at 300-420 square, and cracking of synthetic rubber at 420-500 degrees C. The activation energy E alpha were calculated according to the Coats-Redfern integral method, ca. 154.72-158.23 and 200.46-231.58 kJ/mol for degradation of natural rubber and synthetic rubber, respectively. Most of nitrogen (60.32-67.78 wt.%), sulfur (56.73-62.38 wt.%), and chlorine (58.60-64.92 wt.%) were remained in the pyrolytic char. For the pyrolytic oil composition, expect for alkanes, alkenes, aromatic hydrocarbons, and oxygenates, the S-containing disulfide and sulfurous acid ester, N-containing quinoline and pyrimidine diamine, and Cl-containing silane, dichlorododecylmethylwere detected. The nitrogen, sulfur, and chlorine in pyrolytic gas had diverse types. The N-containing pollutants mainly derived from inorganic ammonium and heterocyclic-N. NH3 had a wide releasing temperature range, while NO, HCN, and HNCO were mainly generated at 300-600 degrees C. The C-S and -SH radicals mainly contributed to S containing pollutants, i.e., H2S, COS, CS2, SO2, CH3SH, and C6H5SH. The Cl-containing pollutants exhibited dominant release within the temperature range of 300-600 degrees C. Overall, higher heating rate promoted gas emissions, especially for NO, HCN, CH3SH, and HCl. This article provides basic knowledge on hazardous N/S/Cl transformation in solid char, liquid oil, and gas during pyrolysis of waste tire that will provide valuable information for future control technologies of pollutants emission.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Electric Literature of 908240-50-6, As an important bridge between the micro and macro material world, chemistry is one of the main methods and means for humans to understand and transform the material world. 908240-50-6, Name is 2,4-Dichloropyrido[3,4-d]pyrimidine, SMILES is ClC1=NC2=C(C=CN=C2)C(Cl)=N1, belongs to pyrimidines compound. In a article, author is Ramesh, Deepthi, introduce new discover of the category.

Therapeutic potential of uracil and its derivatives in countering pathogenic and physiological disorders

Uracil is one of the most notable pharmacophores in medicinal chemistry as the pyrimidine nucleobase forms an integral part of many commercial drugs. Though the name uracil is usually associated with cancer drugs, there are many uracil-based compounds which can treat different diseases when they are employed. So far, there has been no in-depth review concerning uracil drugs in the market, or in the different stages of clinical trials, including those approved or discontinued. The current work focuses on the importance of uracil and its derivatives in treating different diseases. The use of uracil compounds in treating viral infections, cancer, diabetic, thyroid and autosomal recessive disorders are discussed in the review. The mechanism of action of each uracil drug with emphasis on their structure and properties are discussed in detail. The targeted action of these drugs on sites or on the different stages of a disorder/ pathogenic life cycle are also discussed. This review encompasses uracil drugs approved as well as those in development from the 1950’s onwards. The utility of uracil in drug discovery and its association with a wide range of diseases is brought forth within this review to demonstrate its potential to a wider audience. (C) 2020 Elsevier Masson SAS. All rights reserved.

Electric Literature of 908240-50-6, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 908240-50-6 is helpful to your research.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

In an article, author is Serevicius, Tomas, once mentioned the application of 947533-45-1, Category: pyrimidines, Name is 2-bromo-5-fluoropyrimidine, molecular formula is C4H2BrFN2, molecular weight is 176.97, MDL number is MFCD09835164, category is pyrimidines. Now introduce a scientific discovery about this category.

Single-exponential solid-state delayed fluorescence decay in TADF compounds with minimized conformational disorder

Thermally activated delayed fluorescence (TADF) compounds with rapid triplet upconversion in solutions frequently yield drastically lowered upconversion rates in solid hosts due to the conformational disorder, resulting in prolonged multiexponential TADF decay profiles. The dispersion of singlet-triplet gaps was shown to be the nature of this unwanted effect, minimized in compounds with more sterically confined molecular structure, though the observation of low solid-state disorder still is scarce. Therefore, here we present the unambiguous realization of rapid single-exponential solid-state TADF decay in the optimized acridine-pyrimidine TADF compound ACRPyr. The compound was designed to have a rigid molecular structure with negligible conformational disorder along with small singlet-triplet energy gaps, leading to rapid solid-state TADF with a lifetime of about 1.76 mu s, a fluorescence quantum yield of about 0.67 and an exceptional rISC rate of 5.7 x 10(6) s(-1). Furthermore, the ACRPyr based sky-blue OLED device showed a peak EQE of 14.3% with minor roll-off.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 671-35-2, Name is 5-Fluoro-4-hydroxypyrimidine, SMILES is O=C1NC=NC=C1F, in an article , author is EL-mahdy, Kamelia M., once mentioned of 671-35-2, SDS of cas: 671-35-2.

Easy preparation, characterization and reactions of new 8-chloro-7-formyl-4-oxo-2-phenyl-4H-pyrimido[1,2-a]pyrimidine-3-carbonitrile

8-Chloro-7-formyl-4-oxo-2-phenyl-4H-pyrimido[1,2-a]pyrimidine-3-carbonitrile (3) is constructed using N-(5-cyano-6-oxo-4-phenyl-1,6-dihydropyrimidin-2-yl) acetamide (2) via Vilsmeier-Haack formylation reaction. Compound 3 reacted with 3-(triethoxysilyl)propan-1-amine under different conditions. Condensation of pyrimidopyrimidine 3 with thiosemicarbazone derivative gave Schiff base 8, which upon treating with Vilsmeier-Haack reagent afforded pyrazole carbothioamide 9. Cyclocondensation of compound 3 with some binucleophiles namely thiocarbohyrazide, hydrazine carbodithioic acid, benzyl hydrazinecarbodithioate and/or 2-thioxopyrimidinone was investigated. Structures of the new synthesized compounds were confirmed by their analytical and spectral data.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

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. 4270-27-3, Name is 6-Chloropyrimidine-2,4(1H,3H)-dione, molecular formula is C4H3ClN2O2. In an article, author is Abdallah, M.,once mentioned of 4270-27-3, Application In Synthesis of 6-Chloropyrimidine-2,4(1H,3H)-dione.

Expired amoxicillin and cefuroxime drugs as efficient anticorrosives for Sabic iron in 1.0 M hydrochloric acid solution

The effects of two expired antibacterial drugs, amoxicillin (Amo) cefuroxime (Cef), on the corrosion behavior of Sabic iron in 1.0 M HCl solution were examined using weight loss, galvanostatic polarization (GAP), potentiodynamic anodic polarization, and electrochemical impedance spectroscopy techniques. The outcomes showed that the inhibition efficiency increased with increasing concentrations of Amo and Cef and decreased with temperature. The activity of inhibition of these compounds was elucidated by adsorption on Sabic iron surfaces. The adsorption process obeyed the Langmuir isotherm. The activation and adsorption thermodynamic parameters have been determined and clarified. GAP studies indicated that expired Amo and Cef served as mixed inhibitors. The impedance data showed capacitive loop which indicates that charge transfer governs corrosion reactions. Expired Amo and Cef drugs are good pitting inhibitors by positively shifting the pitting potential. There is a complete agreement between the inhibition efficacies obtained from the different measurements

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. 156-83-2, Name is 6-Chloropyrimidine-2,4-diamine, molecular formula is C4H5ClN4, belongs to pyrimidines compound. In a document, author is Selby, Christopher P., introduce the new discover, Application In Synthesis of 6-Chloropyrimidine-2,4-diamine.

Mycobacteria excise DNA damage in 12-or 13-nucleotide-long oligomers by prokaryotic-type dual incisions and performs transcription-coupled repair

In nucleotide excision repair, bulky DNA lesions such as UV-induced cyclobutane pyrimidine dimers are removed from the genome by concerted dual incisions bracketing the lesion, followed by gap filling and ligation. So far, two dual-incision patterns have been discovered: the prokaryotic type, which removes the damage in 11-13-nucleotide-long oligomers, and the eukaryotic type, which removes the damage in 24-32-nucleotide-long oligomers. However, a recent study reported that the UvrC protein of Mycobacterium tuberculosis removes damage in a manner analogous to yeast and humans in a 25-mer oligonucleotide arising from incisions at 15 nt from the 3 ‘ end and 9 nt from the 5 ‘ end flanking the damage. To test this model, we used the in vivo excision assay and the excision repair sequencing genome-wide repair mapping method developed in our laboratory to determine the repair pattern and genome-wide repair map of Mycobacterium smegmatis. We find that M. smegmatis, which possesses homologs of the Escherichia coli uvrA, uvrB, and uvrC genes, removes cyclobutane pyrimidine dimers from the genome in a manner identical to the prokaryotic pattern by incising 7 nt 5 ‘ and 3 or 4 nt 3 ‘ to the photoproduct, and performs transcription-coupled repair in a manner similar to E. coli.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law. In my other articles, you can also check out more blogs about 156-83-2. Application In Synthesis of 6-Chloropyrimidine-2,4-diamine.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Chemistry, like all the natural sciences, Formula: C5H4IN5, begins with the direct observation of nature¡ª in this case, of matter.151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, SMILES is NC1=C2C(NN=C2I)=NC=N1, belongs to pyrimidines compound. In a document, author is Xiang, Weiguo, introduce the new discover.

The 3-D conformational shape of N-naphthyl-cyclopenta[d]pyrimidines affects their potency as microtubule targeting agents and their antitumor activity

A series of methoxy naphthyl substituted cyclopenta [d]pyrimidine compounds, 4-10, were designed and synthesized to study the influence of the 3-D conformation on microtubule depolymerizing and antiproliferative activities. NOESY studies with the N,2-dimethyl N-(6′-methoxynaphthyl-1′-amino)-cyclopenta [d]pyrimidin-4-amine (4) showed hindered rotation of the naphthyl ring around the cyclopenta[d]pyrimidine scaffold. In contrast, NOESY studies with N,2-dimethyl-N-(5′-methoxynaphthyl-2′-amino)-cyclopenta[d]pyrimidin-4-amine (5) showed free rotation of the naphthyl ring around the cyclopenta[d]pyrimidine scaffold. The rotational flexibility and conformational dissimilarity between 4 and 5 led to a significant difference in biological activities. Compound 4 is inactive while 5 is the most potent in this series with potent microtubule depolymerizing effects and low nanomolar IC50 values in vitro against a variety of cancer cell lines. The ability of 5 to inhibit tumor growth in vivo was investigated in a U251 glioma xenograft model. The results show that 5 had better antitumor effects than the positive control temozolomide and have identified 5 as a potential preclinical candidate for further studies. The influence of conformation on the micmtubule depolymerizing and antitumor activity forms the basis for the development of conformation-activity relationships for the cyclopenta [d] pyrimidine class of microtubule targeting agents.

Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 151266-23-8. Formula: C5H4IN5.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

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. 7226-23-5, Name is 1,3-Dimethyltetrahydropyrimidin-2(1H)-one, molecular formula is C6H12N2O. In an article, author is Yu, Yuan,once mentioned of 7226-23-5, Recommanded Product: 7226-23-5.

Combining photo-redox and enzyme catalysis for the synthesis of 4H-pyrimido[2,1-b] benzothiazole derivatives in one pot

A novel strategy combining visible-light and enzyme catalysis in one pot for the synthesis of 4H-pyrimido [2,1-b] benzothiazole derivatives from alcohols is described for the first time. Fourteen 4H-pyrimido [2,1-b] benzothiazole derivatives were prepared with yields of up to 98% under mild reaction conditions by a simple operation. The photoorgano catalyst rose Bengal (rB) was employed to oxyfunctionalise alcohols to aldehydes. Compared with aldehydes, alcohols with more stable properties and lower cost, thus we used photocatalysis to oxidize alcohols into aldehydes. Next, the enzyme was used to further catalyze the reaction of Biginelli to produce the target product of 4H-pyrimidine [2,1-b] benzothiazole. Experimental results show that this method provides a more efficient and eco-friendly strategy for the synthesis of 4H-pyrimido [2,1-b] benzothiazole derivatives.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

In an article, author is Kaspar, Felix, once mentioned the application of 1981-58-4, Name is Sulfamethazine sodium, molecular formula is C12H13N4NaO2S, molecular weight is 300.31, MDL number is MFCD00068333, category is pyrimidines. Now introduce a scientific discovery about this category, Computed Properties of C12H13N4NaO2S.

The Peculiar Case of the Hyper-thermostable Pyrimidine Nucleoside Phosphorylase from Thermus thermophilus**

The poor solubility of many nucleosides and nucleobases in aqueous solution demands harsh reaction conditions (base, heat, cosolvent) in nucleoside phosphorylase-catalyzed processes to facilitate substrate loading beyond the low millimolar range. This, in turn, requires enzymes that can withstand these conditions. Herein, we report that the pyrimidine nucleoside phosphorylase from Thermus thermophilus is active over an exceptionally broad pH (4-10), temperature (up to 100 degrees C) and cosolvent space (up to 80 % (v/v) nonaqueous medium), and displays tremendous stability under harsh reaction conditions with predicted total turnover numbers of more than 10(6) for various pyrimidine nucleosides. However, its use as a biocatalyst for preparative applications is critically limited due to its inhibition by nucleobases at low concentrations, which is unprecedented among nonspecific pyrimidine nucleoside phosphorylases.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Elkanzi, Nadia Ali Ahmed, once mentioned the application of 156-83-2, Name is 6-Chloropyrimidine-2,4-diamine, molecular formula is C4H5ClN4, molecular weight is 144.56, MDL number is MFCD00006097, category is pyrimidines. Now introduce a scientific discovery about this category, Computed Properties of C4H5ClN4.

Synthesis and Biological Activities of some Pyrimidine derivatives: (A-Review)

Nitrogen containing synthetically and biologically important heterocyclic ring system namely pyrimidine possess both biological and pharmacological activities and defend as aromatic six heterocyclic with 1 and 3 nitrogen atom in ring. Preparation of pyrimidine via different methods offer its importance in fields of medicinal chemistry and Chemistry. Pyrimidines and their derivatives act as anti-inflammatory, anti-malaria, anti-tumor, cardiovascular agents, anti-neoplastic, anti-tubercular, anti-HIV, diuretic, anti-viral, anti-microbial, analgesic. This review give light up on biological and pharmacological activities of pyrimidine nucleus.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia