The cationic cobalt(II) porphyrin complex: 5,10,15,20-tetrakis[4-(diethylmethylammonio)phenyl]porphyrinatocobalt(II) tetraiodide has been found to be an efficient catalyst for the oxidation of 2,6-di-tert-butylphenol by dioxygen in aqueous medium. The oxidation reaction afforded mainly the corre...

The novel metalloporphyrins (M = HH, Fe, Mn, Co, Cu, Zn) bearing 2,6-di-tert-butylphenol pendants as antioxidant substituents, and a long chain hydrocarbon palmitoyl group have been synthesized. The oxidation of compounds by PbO2 leads to the formation of the corresponding 2,6-di-tert-butylpheno...

A series of cytotoxic organotin compounds with Sn–S bonds of formulae Me2Sn(SR)2 (1); Et2Sn(SR)2 (2); (n-Bu)2Sn(SR)2 (3); Ph2Sn(SR)2 (4); R2Sn(SR)2 (5); Me3SnSR (6) Ph3SnSR (7) (R = 3,5-di-tert-butyl-4-hydroxyphenyl), synthesized recently, have been used to study the possible mechanisms of thei...

This paper reports a compilation of data for PE+Vitamin E and 2,6-di-tert-butylphenols oxidation in radio-thermal ageing. Data unambiguously show that Vitamin E reacts with P and POO whereas 2,6-di-tert-butyl phenols only react with POO. Kinetic parameters of the stabilization reactions for both...

It was shown that it was possible to perform fluoroalkylation of both sterically-hindered phenolates and phenols with the use of 2,6-di-tert-butylphenol as an example. The role of sulfur dioxide as an activator of the interaction process was established.

The present study revealed a facile, ultrasound assisted ceria nanoparticle synthesis route by the reduction of cerium nitrate hexahydrate in different solvents at room temperature. The different solvents employed were methanol (MeOH), ethylene glycol (EG), water (aq) and isopropyl alcohol (IPA)...

3-Methylindol-2-yl methyl ketone reacted with phosphoryl chloride in dimethylformamide to give 3-chloro-3(3-methylindol-2-yl), propenal (4). 2-Carbomethoxy- and 2-carbethoxy-1-chloro- 9H-pyrrolo[1,2-a]indol-9-ylidene acetaldehyde (10a and b) were formed by reaction with the same reagent of 3(3-m...

An approach for the enantioselective synthesis of functionalized γ-lactones and its application to the syntheses of (−)-muricatacin 1a and 5-epi-(−)-muricatacin 1b is reported. A sequential oxidation of the intermediate 4 with m-chloroperoxybenzoic acid was conducted to realize the reaction mec...

Cinnabar (α-HgS), has been formulated in Traditional Chinese Medicines (TCMs) for thousands of years. Since the total Hg content was accepted widely as the toxicity criteria, the safety alerts have been issued about the cinnabar containing TCMs for exceeding Hg limits. However, cinnabar is almo...

Beginning around 1400 BCE, cinnabar (HgS) was highly valued and widely traded in prehispanic Peru. A review of the ethnohistoric and archaeological evidence suggests that this mercury ore was mainly used in powdered form as a face and/or body paint on special occasions and that its application w...

Realgar and cinnabar are commonly used mineral medicine containing arsenic and mercury in Traditional Chinese Medicine (TCM). Angong Niuhuang Wan (AGNHW) is a representative realgar- and cinnabar-containing TCM formula for treating acute ischemic stroke, but its toxicology and neuropharmacologic...

BackgroundCinnabar has a long history of uses in Chinese traditional medicines as an ingredient in various remedies. However, the detailed mechanism of cinnabar in medication remains unclear, and the toxicity of cinnabar has been a debate due to its containing mercury sulfide. This study was des...

The darkening process of cinnabar and vermilion-based paint surfaces as well as pigment-binder interactions upon weathering have been studied by subjecting egg-yolk tempera dosimeters to UV-aging, RH cycling, and 2-year outdoor weathering with and without direct exposure to rain and sunlight. X-...

Three artificial electron acceptors potassium hexacyanoferrate (K3Fe(CN)6) ‘ferricyanide’ (HCF III), potassium hexachloroiridate (K2 IrCl6) (HCl IV), and potassium hexabromoiridate (K2IrBr6) (HBI IV), have been compared with respect to their reduction by roots, membrane permeability, phytotoxi...

N-tert-Butylbenzenesulfenamide (1)-catalyzed oxidation of various primary and secondary alcohols to the corresponding aldehydes and ketones was efficiently carried out by using N-chlorosuccinimide (NCS) in the coexistence of potassium carbonate and molecular sieves 4 Å at easy-to-control tempera...

The heavy metals are naturally occurring elements and becoming the main source of pollution in our eco-environment due to their commercial applications. So, for the probe of heavy metal cations, bidentate chelating agents N,N′-(ethane-1,2-diyl)bis(4-methoxybenzene sulfonamide) [EDBMBS] and N,N′...

Two bis-sulfonamides, N,N′-(ethane-1,2-diyl)bis(2,5-dimethoxybenzenesulfonamide) (EBDMBS) and N,N′-(ethane-1,2-diyl)bis(2-methoxy-5-bromobenzenesulfonamide) (EBMBBS) were synthesized to study their applications as heavy metal sensors. These molecules were prepared via very environment friendly...

A number of 1,2-dialkynyl-3-alkyl or 3-aryl allylic esters underwent a facile Eu(fod)3-catalyzed rearrangement at 20–132 °C to give exclusively cis-enediynes. The esters capable of forming a chelate with Eu(III) exhibited a remarkably enhanced reactivity; the C3 aryl group facilitated the rear...

The proton magnetic resonance spectra of the adducts of Ln(fod)3 with 2,2′-bipyridyl and 1,10-phenanthroline, where Ln = La, Lu, Pr, Nd, Sm, Eu and Yb, have been studied in solution. The chemical shifts recorded have been analysed for these complexes and are dipolar in origin. Shifts are larger...

This study presents the effects of nanoscale zero valent iron (nZVI) concentration on the biomethanation of gaseous CO2. During anaerobic batch experiment with 9 times injection of CO2, the CO2 concentration in the headspace rapidly decreased by dissolution. Then, when nZVI was added at 6.25 and...