Phytochemical research on the dry flower of Carthamus tinctorius L. led to the isolation of two new epimeric tetrahydro-β-carboline alkaloids (1 and 2), together with three known analogues (3–5). Their planar structures were determined by comprehensive 1D, 2D-NMR, and HR-ESI–MS spectroscopic ...
A simple method for the preparation of enantiopure furo[2,3-b]pyrroles, a rare class of concave bicyclic nitrogen and oxygen heterocycle, in promising yield has been developed. The 3-substituted pyrrolidinediones prepared from (2S,3S)-tetrahydro-3-hydroxy-5-oxo-2,3-furandicarboxylic acid (Garcin...
1,4,5,6-Tetrahydro-1-tosyl-6-tosylhydrazinopyridazines were prepared by reaction of a 1,4-ketoaldehyde with two equivalents of tosylhydrazine. Thus-obtained hydropyridazines were utilized as a substrate for synthesis of various 1,4,5,6-tetrahydropyridazine derivatives by activation with a Lewis ...
A novel I2-catalyzed one-pot multicomponent protocol for the synthesis of a variety of elusive furo[2,3-b]pyrrole and thieno[2,3-b]pyrrole libraries has been established. To date, cyclization among alkanone, hydrazine and 2-bromobenzofuran or 2-bromobenzo[b]thiophene has not been explored in one...
A new fused heterocyclic derivatives of pyrrole containing acetonitrile or cyanoacetonitrile moiety at 3-position is described by a one-pot multicomponent reaction. The reaction of dimedone, various aniline, aryl glyoxal with malononitrile/ethyl cyanoacetate/methyl cyanoacetate under mild condit...
Reaction of methyl 1-bromocyclobutanecarboxylate with zinc and 1-aryl-2-(arylimino)ethanones leads to 4,6a-diaryl-3,3:6,6-dipropano- tetrahydro-2H-furo[3,2-b]pyrrole-2,5(3H)-diones. Structure of one of these compounds is confirmed by X-ray analysis.
DNA damage plays an important role in mutagenesis, carcinogenesis, aging and several other pathophysiological conditions. Crotonaldehyde is a four carbon unsaturated bifunctional aldehyde produced both exogenously and endogenously. It reacts with deoxyguanosine in DNA to form adducts. In this st...
Crotonaldehyde, a highly toxic α, β-unsaturated aldehyde, is a major component of cigarette smoke (CS) and a ubiquitous environmental pollutant. Exposure to crotonaldehyde-rich pollutants such as CS is associated with suppression of respiratory host defense against infections. The aim of this ...
Crotonaldehyde is an important intermediate in the chemical industry and usually produced from acetaldehyde in aqueous solution. Recently, new results on the reactions which yield crotonaldehyde from acetaldehyde have become available. It was shown that the formation of aldoxane from acetaldehyd...
Crotonaldehyde is a liquid that is naturally found in some foods and also acts as an environmental pollutant. Crotonaldehyde is commercially used in the leather and rubber industry; therefore, people working with manufacturing such products are exposed to higher levels of this compound. Signific...
IntroductionCrotonaldehyde is an α,β-unsaturated carbonyl compound that is a potent eye, respiratory, and skin irritant. Crotonaldehyde is a major constituent of tobacco smoke and its exposure can be quantified using its urinary metabolite N-acetyl-S-(3-hydroxypropyl-1-methyl)-L-cysteine (HPMM...
For trans- and cis-crotonaldehydes CH3CHCHCHO in the triplet and singlet lowest excited electronic states of n,π* and π,π* types, the geometries of conformers, conformer energy differences, and conformational dynamics have been addressed using ab initio multi-reference techniques (CASSCF and ...
Crotonaldehyde is an ubiquitous hazardous pollutant in the environment which can be produced naturally, artificially and endogenously. Acute exposure of crotonaldehyde was reported to induce severe lung injury in humans and experimental animals. However, the exact toxicity mechanisms of crotonal...
Crotonaldehyde is a common environmental contaminant. Autophagy, apoptosis, and necrosis, were all respectively reported to be induced by crotonaldehyde. However, the relationships between programmed cell deaths, especially between autophagy and apoptosis, have not been elucidated. In the presen...
This study investigated the performance of a biofilter to remove crotonaldehyde from air. Total average of removal efficiency (RE) and elimination capacity (EC) were 88% and 0.73 g m−3 h−1, respectively. Nearly 57% of the RE was occurred in the first 20 cm of the biofilter, where the bacterial p...
The condensation reaction of butyraldehyde with poly(vinyl alcohol) at various degrees of polymer conversion was studied from the kinetic point of view. The reaction was carried out at 20–50 °C. On the basis of the effective rate constants calculated from the kinetic investigations, it was inf...
A simple sol–gel process is followed to construct a thin layer of mesoporous silica shell core–shell structure on micrometer sized and nanometer sized zeolite A (micro-zeolite [email protected]2 and nano-zeolite [email protected]2 respectively). Further thickness of the silica shells has been ...
Steam reforming (SR) of n-butanol and its main reaction intermediates, i.e., 1-butene, and butyraldehyde, was studied over 0,5 wt.% Rh/ZrO2 catalyst at 500 and 700 °C, atmospheric pressure and steam to carbon (S/C) molar ratio of 4. Coke deposits on the spent catalyst samples were characterized...
Dielectric barrier discharge DBD-plasma based technologies have been widely investigated for the abatement of air pollutants. More recently, photocatalysis (TiO2/UV-lamp) has also showed promising results for air pollution abatement. In this work, these two methods were used separately and combi...
A promising alternative for the production of butyraldehyde is the use of n-butanol as raw material. This alcohol can be produced via fermentation from renewable resources. n-Butanol can be converted to butyraldehyde by dehydrogenation or by partial oxidation and for both reactions Cu catalysts ...
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