Copper complexes of two cycloalkanespiro-5-dithiohydantoins: Synthesis, oxidation states and characterization

Zhao

et al. 2011

Ind. Eng. Chem. Res.

One of effective ways to reduce pollution from cigarette butts is introduced by recycling the cigarette butts. Inhibitor from recycled cigarette butts shows good inhibition properties, but we do not know whether CuCl can help to improve the inhibition efficiency. So, in this study, the impact of CuCl on recycled cigarette butts as corrosion inhibitor for N80 steel at 90 °C in 15% HCl is studied by weight loss, electrochemical noise, polarization, impedance, and X-ray photoelectron spectroscopy. All the results show that the inhibition efficiency of water extracts from cigarette butts in the presence of CuCl is higher than in absence of CuCl, and it can reach 95.3% when 9% water extracts with copper added is used. The X-ray photoelectron spectroscopy results indicate that the N80 steel specimen surface is undamaged and covered with a protective coat formed by copper-added water extracts from cigarette butts. CuCl has synergizing action on recycled cigarette butts as a corrosion inhibitor for N80 steel at 90 °C in 15% HCl.

Section: Resultsmentioning

confidence: 99%

Synergized Action of CuCl on Recycled Cigarette Butts as Corrosion Inhibitor for N80 Steel at 90 °C in 15% HCl

Zhao

et al. 2011

Ind. Eng. Chem. Res.

“…Coordination with some transition metals was previously studied. [30][31][32][33][34][35] . The resulting complexes can contain 2-thiohydantoins as either neutral ligands or monoanions, which are formed upon deprotonation of the N-H group.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and cytotoxicity of palladium(II) complex of 3-[(2-hydroxy-benzylidene)-amino]-2-thioxo-imidazolidin-4-one

Šmit

Pavlovic

Radosavljevic-Mihailovic³

et al. 2013

JSCS

The polydentate ligand, 3-[(2-hydroxy-benzylidene)-amino]-2-thioxo-imidazolidin-4-one, was synthesized by intermolecular cyclocondensation reaction of 2-hydroxybenzaldehyde thiosemicarbazone and ethylchloroacetate. Novel palladium(II) complex was obtained by nucleophilic substitution of both DMSO ligands from cis-[Pd(DMSO)2Cl2] with iminic nitrogen and thiolactamic sulfur from ligand. The structure of compounds was characterized on the basis of their spectral data. The cytotoxic activity of the ligand and palladium(II) complex was studied on tumor cell lines: human colon carcinoma HCT-116 and SW-480 cells using MTT viability test. The results show that investigated palladium(II) complex has significantly greater cytotoxic effect compared to ligand. [Projekat Ministarstva nauke Republike SRbije, br. 172011 and III41010

“…The 1 H, 13 C and 19 F NMR spectra were recorded in CDCl 3 solvents or d 6 -DMSO solvents on an NMR spectrometer using TMS as the internal standard. HRMS was measured on an electrospray ionization (ESI) apparatus using time-of-flight (TOF) mass spectrometry.…”

Section: Experimental Section General Considerationsmentioning

confidence: 99%

“…Thus, a series of 2,4-dithiohydantoin metal complexes had been synthesized and investigated. [19] Although several methods have been developed for the synthesis of 2,4dithiohydantoins compounds, some deficiencies have always existed, such as the use of highly toxic reagents: cyanide compound (Scheme S1 in the ESI †). Different from previous synthetic efforts (Scheme S1 in the ESI †), our work on the (3 + 2) cyclization reaction of αketo sulfines with N-substituted thioureas translates to a simple, step-economic synthetic protocol without harsh reagents.…”

mentioning

confidence: 99%

Regiospecific Formal [3+2] Annulations of α‐keto Sulfines and N‐Substituted Thioureas

et al. 2023

A series of 2,4-dithiohydantoins were synthesized regiospecificlly from various phenacyl sulfoxides bearing 1-methyl-1H-tetrazole and Nsubstituted thioureas in moderate to excellent yields. The proposed mechanism involved the generation of α-sulfines from sulfoxides through thermolytic elimination, carbonphilic attack of sulfines by substituted thioureas, and dehydration condensation. The current method provides a safe strategy for the preparation of 2,4-dithiohydantoins.