Thematische Bibliographien / Chloro/Nitro-4H

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Auswahl der wissenschaftlichen Literatur zum Thema „Chloro/Nitro-4H“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Chloro/Nitro-4H"

Safieh, Kayed A. Abu, Feda’a S. Al-Masri, Mikdad T. Ayoub, Mustafa M. El-Abadelah und Wolfgang Voelter. „Synthesis of Some 1,3-Dimethyl-6-substituted-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones“. Zeitschrift für Naturforschung B 66, Nr. 11 (01.11.2011): 1136–40. http://dx.doi.org/10.1515/znb-2011-1109.

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A series of new 6-substituted-1,3-dimethyl-1H-pyrazolo[3,4-b]pyrazin-5(4H)-ones (13a - e) and 1,3-dimethyl-5a,6a,7,8-tetrahydro-1H-pyrazolo[4,3-e]pyrrolo[1,2-a]pyrazin-5(4H)-one (15) have been synthesized. The synthetic strategy involves direct interaction of D,L-α-amino acids with 5- chloro-1,3-dimethyl-4-nitro-1H-pyrazole (10) to produce the respective N-(1,3-dimethyl-4-nitro-1Hpyrazol- 5-yl) D,L-α-amino acids 11a - e and 14. The latter compounds underwent reductive lactamization to deliver the corresponding target heterocyclic systems 13a - e and 15

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Ishikawa, Yoshinobu. „6-Chloro-8-nitro-4-oxo-4H-chromene-3-carbaldehyde“. Acta Crystallographica Section E Structure Reports Online 70, Nr. 5 (12.04.2014): o547. http://dx.doi.org/10.1107/s1600536814007788.

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In the title compound, C10H4ClNO5, the non-H atoms of the 6-chlorochromone unit are coplanar (r.m.s. deviation = 0.017 Å) with the largest deviation from the mean plane [0.031 (2) Å] being found for the C=O C atom. The nitro group (NO2) is inclined to the chromone unit mean plane by 13.3 (2) °. The formyl group is also twisted with respect to the attached ring [C—C—C—O torsion angles = 10.8 (4) and −171.8 (2)°]. In the crystal, molecules are linked via C-H...O hydrogen bonds forming slab-like networks lying parallel to (-301). The slabs are linked by π–π interactions involving the benzene rings of the chromone units [centroid–centroid distance = 3.770 (3) Å].

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SG, Jawarkar, und Game MD. „Synthesis, Characterization and Antimicrobial Activity of Novel 2-Azetidinones Compounds“. INTERNATIONAL JOURNAL OF PHARMACEUTICAL QUALITY ASSURANCE 15, Nr. 01 (25.03.2024): 242–48. http://dx.doi.org/10.25258/ijpqa.15.1.38.

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A series of 2-azetidinone derivatives were synthesized by the formation of triazole, followed by synthesis of Schiff’s bases by condensation of various substituted aldehydes. The Schiff’s bases further reacted to chloroacetyl chloride in the presence of triethyl amine, and undergoes cyclocondensation to give substituted 3-chloro-1-(3-mercapto-5-((5-methoxy-1H-indol-1-yl)methyl)-4H-1,2,4-triazol-4-yl)-4-phenylazetidin-2-one which on further reaction with ethyl chloroacetate, gives substituted ethyl 2-((4-(3-chloro-2-oxo-4-phenylazetidin-1-yl)-3-((5-methoxy-1H-indol-1-yl)methyl)-4,5-dihydro-1H-1,2,4-triazol-5-yl)thio)acetate. Synthesized compounds were by characterized by fourier-transform infrared (FTIR), nuclear magnetic resonance (NMR) (1H, 13C), and mass spectroscopy. All synthesized compounds were evaluated for its in-vitro antimicrobial activity against Gram-positive and gram-negative bacterial as well as fungal strains. The antimicrobial activity results revealed that A-VI, A-IX, A-XVIII, displayed equipotent activity when compared with the standard drug. The compounds with p-chloro and p-nitro group exhibited the most potent antimicrobial agent.

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M. Daoud, Khalid, Amal N. Ali und Amina A. Ahmed. „Synthesis of 2-(3-chloro-4-nitro-1-benzothien-2-yl)-1,3,4-oxadiazole-1,3,4-thiadiazole and 5-(3-chloro-4-nitro-1-benzothien-2-yl)-4H-1,2,4-triazole-3-thiol“. JOURNAL OF EDUCATION AND SCIENCE 23, Nr. 4 (01.12.2010): 19–26. http://dx.doi.org/10.33899/edusj.2010.59245.

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Ajermoun, N., A. loudiki, A. Farahi, S. Lahrich, S. Saqrane, M. Bakasse und M. A. El Mhammedi. „Review—Sensor Evaluation for Thiamethoxam Detection in Different Matrices“. Journal of The Electrochemical Society 168, Nr. 11 (01.11.2021): 116508. http://dx.doi.org/10.1149/1945-7111/ac38f5.

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Thiamethoxam (3-[(2-chloro-5-thiazolyl)methyl] tetrahydro-5-methyl-N-nitro-4H-1,3,5-oxadiazin-4- imine) is a representative compound of new neonicotinoid insecticides, which can selectively act on the central nervous system of insects and is widely used to control sucking insect pests. Due to its extensive usage, high water solubility, high leaching capability, low soil adsorption, and poor biodegradability, the residues of the thiamethoxam persist in the environment with adverse effects. Therefore, it is necessary to develop analytical tools for the monitoring of thiamethoxam. An electrochemical sensor is suitable for rapid and simple analyses of pesticides, which are likely to persist at a trace level in agro-environments, including agricultural products, soil, and water. Here, the new trends in sensors development and the application for the detection of thiamethoxam in the environmental are described. The fundamental analytical performance of the electrodes is discussed. The application of these sensors for thiamethoxam monitoring in different matrices is reported.

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Raja, Rajamani, Subramani Kandhasamy, Paramasivam T. Perumal und A. SubbiahPandi. „Crystal structure of 4-(6-chloro-4-oxo-4H-chromen-3-yl)-2-methylamino-3-nitro-4H,5H-pyrano[3,2-c]chromen-5-one chloroform monosolvate“. Acta Crystallographica Section E Crystallographic Communications 71, Nr. 7 (27.06.2015): o512—o513. http://dx.doi.org/10.1107/s2056989015011810.

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In the title compound, C23H14Cl4N2O7, the pyran ring has an envelope conformation with the methine C atom as the flap. The chromene rings are almost planar (r.m.s. deviations of 0.027 and 0.018 Å) and their mean planes are inclined to one another by 85.61 (10)°. The mean planes of the pyran ring and the chromene ring fused to it are inclined to one another by 7.41 (13)°. The molecular structure is stabilized by an intramolecular N—H...O hydrogen bond, generating anS(6) ring motif. In the crystal, molecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers with anR22(12) ring motif. The dimers are linked by pairs of C—H...O hydrogen bonds, enclosingR22(18) ring motifs, forming chains along [010]. Within the chains there are C—H...π interactions. The chains are linkedviaslipped parallel π–π interactions, forming a three-dimensional structure [the shortest inter-centroid distance is 3.7229 (19) Å].

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Jyoti Thakur, Anup Kumar Chakraborty, Jaya Pandey und Manoj Chincholkar. „Potential Utility Of 2-(2-(5-Nitro-1-H-Benzo[D]Thiazole-2-Yl) Vinyl)-4H-6-Chloro Chromene-4-One to Mitigate the Toxic Impact of Xenobiotics in Mammals“. Journal of Advanced Zoology 44, S-5 (18.11.2023): 2507–16. http://dx.doi.org/10.17762/jaz.v44is-5.1934.

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This research aimed to investigate the individual and combined effects of two substances, 2-(2-(5-nitro-1-H-benzo[d]thiazole-2-yl) vinyl)-4H-6-Chloro Chromene-4-one referred as S1 and 2-(2-(5-nitro-1-H-benzo[d]thiazole-2-yl) vinyl)-4H Chromene-4-one referred as S2, on the survival of rats and the characteristics of total mRNA involved in molecular genetic processes in these animals. The study was conducted using Wistar Han (SPF) rats. S1, when administered at doses of 13 and 0.013 mg/kg body weight, which correspond to 1/100 and 1/100000 of the lethal dose (DL50), did not result in any clinical signs of intoxication in the rats. S1 was found to increase the level of hybridization in mRNA preparations obtained from both rat liver and blood cells. This effect was more pronounced at the higher dose of 13 mg/kg body weight compared to the lower dose of 0.013 mg/kg body weight. In contrast, when rats were exposed to S2 at a dose of 540 mg/kg body weight, equivalent to 1 DL50, pronounced intoxication was observed after 6 hours, leading to a 40% mortality rate among the animals. Interestingly, when rats were first intraperitoneally administered S1, followed by oral administration of S2 at the same doses (after 24 hours), the rats remained viable. Furthermore, the degree of hybridization of cytoplasmic mRNA with [ɑ32P]-cDNA only showed a slight decrease by the end of the second day. By the third day, the overall condition of the animals had returned to normal. This combined treatment also resulted in an increase in the degree of hybridization between the mRNA molecules isolated from control rats and [ɑ32P]-cDNA obtained from the experimental group. In summary, this study suggests that S1, even at higher doses, does not induce intoxication in rats and can enhance mRNA hybridization. Furthermore, when administered before S2, it appears to protect the rats from the toxic effects of S2, as indicated by their improved survival and the recovery of molecular genetic processes.

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Srinivasulu, D., und C. Devendranath Reddy. „ChemInform Abstract: Synthesis and Antimicrobial Activity of 2-Substituted-6-chloro-8-nitro-4-trichloromethyl-4H-1,3,2-benzodioxaphos phorin 2-Oxides.“ ChemInform 32, Nr. 3 (16.01.2001): no. http://dx.doi.org/10.1002/chin.200103144.

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Anupam, Anupam, Mohammed Al-Bratty, Hassan Ahmad Alhazmi, Shamim Ahmad, Supriya Maity, Md Shamsher Alam und Waquar Ahsan. „Synthesis and biological evaluation of triphenyl-imidazoles as a new class of antimicrobial agents“. European Journal of Chemistry 9, Nr. 4 (31.12.2018): 369–74. http://dx.doi.org/10.5155/eurjchem.9.4.369-374.1785.

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Newer triphenyl-imidazole derivatives (4a-h) were synthesized in good yields by the reaction of benzil and substituted benzaldehydes in equimolar quantities and refluxing the product with acetyl chloride thereafter. Structures were confirmed by using FT-IR, 1H NMR and 13C NMR spectroscopic methods. All the synthesized compounds were tested for their antimicrobial activity using agar diffusion technique against Gram positive (Staphhylococcus aureus and Bacillus subtilis), Gram negative (Escherichia coli and Pseudomonas aureginosa) as well as Fungal strain (Candida albicans). Interestingly compounds 4a, 4b, 4f and 4h showed significant antibacterial activity, whereas compound 4b was found to have remarkable activity against the fungal strain. The Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of most active compounds were determined by broth dilution method and compound 4b emerged to have potent activities against most of the strains having MIC in the range of 25-200 µg/mL. To check the possible toxicities of the most active compounds, they were orally administered in rats and the concentration of liver enzymes serum glutamic-oxaloacetic transaminase (SGOT), serum glutamic pyruvic transaminase (SGPT) and alkaline phosphatase (ALKP) were determined. Compound 4h showed significant increase in the enzymes level depicting the hepatotoxicity. The structure-activity relationship studies showed the importance of electron withdrawing groups at the distant phenyl ring at ortho and para positions as the compounds having chloro or nitro at these positions tend to be more active than the compounds with electron releasing groups such as methoxy. These compounds may act as lead compounds for further studies and appropriate modification in their structure may lead to agents having high efficacy with lesser toxicity.

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Dauzonne, Daniel, Hubert Josien und Pierre Demerseman. „(2-chloro-2-nitroethenyl)benzenes as synthons: a general method for the preparation of 2,3-dihydro- 2-nitro-3-phenyl-4H-furo [3,2-c] [1]benzopyran-4-ones and 3-phenyl-4H-furo[3,2-c][1]benzopyran-4-ones“. Tetrahedron 46, Nr. 21 (Januar 1990): 7359–71. http://dx.doi.org/10.1016/s0040-4020(01)89053-0.

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Dissertationen zum Thema "Chloro/Nitro-4H"

Dasgupta, Jhinuk. „Investigation on some 2-Alkylamido 6-chloro/Nitro-4H-1, 3, 2-Benjodi-oxaphosphorin-2 - Sulphides having pesticidal activities“. Thesis, University of North Bengal, 1988. http://hdl.handle.net/123456789/1130.

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