جستجوی مقالات مرتبط با کلیدواژه « oxime » در نشریات گروه « شیمی »

Extensive utilization of pesticides in the agricultural sector is acknowledged for their potent insecticidal properties, effectively safeguarding crops and consequently enhancing both yield and quality. However, the organophosphate compounds (OPs) predominantly found in these pesticides are highly toxic and known for their rapid skin absorption, leading to acute poisoning and posing public health challenges. Early exposure requires immediate and efficient decontamination to prevent further skin absorption of OPs. The current cleaning agents, such as soap and bleach, are often associated with harsh chemicals that can be corrosive to the skin. Furthermore, these conventional options tend to merely wash away chemicals, potentially leaving effluent that still carries toxic compounds, causing pollution to the environment. Thus, there is a need for approaches that not only clean effectively but also degrade the harmful substances. This paper proposes a method to synthesize solid soap from palm oil incorporating 2-PAM as an active agent for effective decontamination. The resulting yellowish solid soaps exhibit pH values in the 9-10 range, lathering capabilities, and controlled moisture content (4.19 % for S1, 2.42 % for S2, 2.1 % for S3). FTIR analysis confirms successful 2-PAM integration in soaps S2 and S3, as evidenced by specific bands at 3016 cm-1 to 3015 cm-1, 1736 cm-1 to 1735 cm-1, 1368 cm-1 to 1364 cm-1, and 1217 cm-1 to 1215 cm-1. These characteristics set the stage for further research into the efficacy of these soaps in organophosphate decontamination and their role in environmental pollution control.

Water is the main pillar of human life, which experiencing widespread pollutions that turn clean waters to a non consumption form gradually. Contaminating resources of the clean waters are the human and industries have been made by the human. Because the available water resources for humans and organisms are limited, we must seek recovery of contaminated waters. Some novel oxime and azo dye-based compounds from spiro dihydrofurans were synthesized. All structures were characterized by IR, 1H, and 13C NMR spectroscopy techniques. Some pollutant metal cations of Ni2+, Cu2+, Co2+, Mn2+, and Zn2+ in water and industrial wastewater were examined in the presence of novel ligands. The UV-visible spectral data indicated that 4a selectively absorbed Ni2+ at room temperature and natural pH conditions. Instead, 4b absorbed all cations with exception of Ni2+ under the same condition.

The compounds used in this study, TET and OXM, were tested in vitro for their antibacterial activities against isolated strains from the hospital environment (S. aureus H, E. coli H and K. pneumoniae H) and reference strains (S. aureus A, E. coli A, B. subtilis A and P. aeruginosa A). The calculation of the MBC/minimum inhibitory concentration ratio of the products TET and OXM showed that the two products have a bactericidal effect on the strains tested.

Oxime extractants 3-tert-butyl-2-hydroxy-5-methyl benzaldehyde oxime (HL1) and 3-tert-butyl-2-hydroxy-5-methoxy benzaldehyde oxime (HL2) were synthesized and characterized by conventional spectroscopic methods. Suitable lipophilic nature of the prepared extractants allowed examining the ability of these molecules for extraction-separation of copper from its mixture with normally associated metal ions by performing competitive extraction experiments of Cu(II), Co(II), Ni(II), Zn(II), Cd(II) and Pb(II) ions from chloride solutions. Both ligands transfer selectively the copper ions into dichloromethane by a cation exchange mechanism. Conventional log-log analysis and isotherm curves showed that Cu(II) ions are extracted as the complexes with 1:2 metal to ligand ratio by both extractants. Verification of the effect of the organic diluent used in the extraction of copper ions by HL1 and HL2 demonstrated that the extraction efficiency varies as: dichloromethane ~ dichloroethane > toluene > xylene > ethylacetate. Time dependency investigation of the extraction processes revealed that the kinetics of the extraction of copper by HL2 is more rapid than that of HL1. The application of the ligands for extraction-separation of copper ions from leach solutions of cobalt and nickel-cadmium filter-cakes of a zinc production plants was evaluated.

Various aldoximes and ketoximes synthesis of corresponding aldehydes and ketones in the presence of SiO2@FeSO4 nano composite as recoverable nano catalyst and NH2OH·HCl. The SiO2@FeSO4 nano composite system was carried out between 10 to 15 min in oil bath (70-80 °C) under solvent-free condition in excellent yields in addition this protocol can be used for industrial scales. This method offers some advantages in term of clean reaction conditions, easy work-up procedure, short reaction time, applied to convert α-diketones to α-diketoximes (as longer than other carbonyl compounds), α,β-unsaturated aldehydes and ketones to corresponding oximes and suppression of any side product. So we think that NH2OH•HCl/SiO2@FeSO4 nano composite system could be considered a new and useful addition to the present methodologies in this area. Structure of products and nano composite elucidation was carried out by 1H NMR, 13C NMR, FT-IR, scanning electron microscopy (SEM).

o-Xylylenebis (triphenylphosphonium peroxymonosulfate) (1) was easily prepared from an aqueous solution of oxone and o-xylylenebis- (triphenylphosphonium bromide). This Compound (1) is a useful and selective reagent for conversion of oximes, semicarbazones and phenylhydrazones to the corresponding carbonyl compounds. The reaction was carried out under solvent-free conditions and in the presence of catalytic amount of aluminium chloride. This method shows a good selectivity in oxidation of oximes, semicarbazones and phenylhydrazones in the presence of aliphatic and aromatic alcohols. The advantages of the present method include good functional group tolerance, high yields of products, simple experimental procedure and purification, no solvent and short reaction times.

Nano silica-H2SO4 is an efficient and mild catalysis system for the regeneration of aldehyde from aldoximes. Ketoximes are converted to amides by Beckmann rearrangement in the presence of nano silica-H2SO4. The reactions are carried out in solvent-free conditions under microwave irradiation (600 W) within 50-120 sec in good yields.