Results 11 to 20 of about 4,172 (223)

Phosphosulfonic acid, an efficient solid acid catalyst for the one-pot preparation of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes under solvent-free conditions [PDF]

Journal of the Serbian Chemical Society, 2013
An expeditious procedure for the synthesis of 14- aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes through one-pot pseudo three component condensation of β-naphthol or dimedone with various aryl aldehydes is described.
Kiasat Reza Ali, Mouradzadegun Arash, Saghanezhad Jafar Seyyed   +2 more
doaj   +3 more sources

Synthesis and characterization of selected fused isoxazole and pyrazole derivatives and their antimicrobial activity [PDF]

Journal of the Serbian Chemical Society, 2009
New potent antibacterials, fused isoxazole and pyrazole derivatives, were synthesized using 5,5-dimethylcyclohexane-1,3-dione (1) and 3-[(4-chlorobenzylidene)amino]-2-thioxoimidazolidin-4-one (2) as synthons. Aromatic aldehydes on condensation with 1 and
VIJAY V. DABHOLKAR, FAISAL Y. ANSARI
doaj   +5 more sources

The use of tristimulus colorimetry for the determination of hydrogen cyanide in air by a modified König method [PDF]

Journal of the Serbian Chemical Society, 2010
A simple visual and tristimulus colorimetric method (three-dimensional system CIE-L*a*b*) for the determination of trace amounts of hydrogen cyanide in air has been developed.
VLADIMÍR PITSCHMANN, IVANA TUŠAROVÁ, EMIL HALÁMEK, ZBYNĚK KOBLIHA   +3 more
doaj   +3 more sources

Surfactant Derived From Stearoyl Chloride and Benzimidazole for Micellar-Promoted Synthesis of N-Aryl-1,8-dioxo-decahydroacridines in Water at Room Temperature. [PDF]

ChemistryOpen
A new anionic surfactant was synthesized via a one‐pot reaction of stearoyl chloride and benzimidazole with aluminum chloride under reflux. The surfactant was effective in synthesizing 1,8‐dioxodecahydroacridines, achieving a 96% yield in water without the need for cocatalysts.
Asadian S, Moradian M, Safari J.
europepmc   +2 more sources

Isolable Cysteine Sulfenyl Iodide: Stabilization by a Molecular Cradle, Crystal Structure, and Biologically Relevant Reactivity. [PDF]

Chembiochem
An isolable cysteine sulfenyl iodide (Cys–SI) stabilized by a molecular cradle is reported. X‐ray analysis and reactivity studies reveal hydrolysis to sulfenic acid, electrophilic substitution with indoles, and high reactivity toward amines and dimedone, providing direct evidence for long‐standing proposals on iodine‐mediated protein modification ...
Otaka S, Sano T, Sase S, Kuwano S, Goto K.   +4 more
europepmc   +2 more sources

Cysteine perthiosulfenic acid (Cys-SSOH): A novel intermediate in thiol-based redox signaling?

Redox Biology, 2018
The reversible oxidation of protein cysteine residues (Cys-SH) is a key reaction in cellular redox signaling involving initial formation of sulfenic acids (Cys-SOH), which are commonly detected using selective dimedone-based probes.
David E. Heppner, Milena Hristova, Tomoaki Ida, Ana Mijuskovic, Christopher M. Dustin, Virág Bogdándi, Jon M. Fukuto, Tobias P. Dick, Péter Nagy, Jianing Li, Takaaki Akaike, Albert van der Vliet   +11 more
doaj   +1 more source

Gas phase carbon acidity and correlations with aqueous pK~a~ values: A comparison of B3LYP/6-311++G(d,p), Gaussian-4 (G4), and experimental approaches [PDF]

, 2010
Gas phase standard state (298.15 K, 1 atm) calculations were conducted at the B3LYP/6-311++G(d,p) density functional and the Gaussian-4 (G4) composite method levels of theory to estimate the acidity of various carbon acids.
Kaya Forest, Sierra Rayne
core   +2 more sources

Synthesis and Biological Evaluation of Some Newly Synthesized Barbiturates and Their Derivatives by Using Task Specific Ionic Liquid [Bmim]OH

Orbital: The Electronic Journal of Chemistry, 2019
Eco-friendly synthesis of some selected Barbiturates, Thiobarbiturates and Dimedone derivatives has been developed by using task specific ionic liquid Bmim[OH], which not only act as catalyst but also  are best solvent media for the Knoevenagel ...
Giribala Madhavrao Bondle, Sandeep T. Atkore   +1 more
doaj   +3 more sources

Tandem Aldol-Michael reactions in aqueous diethylamine medium: a greener and efficient approach to dimedone-barbituric acid derivatives [PDF]

, 2014
BACKGROUND: Green chemistry is a rapidly developing new field that provides us with a proactive avenue for the sustainable development of future science and technologies.
Abdulaziz Al-Ghamdi, Abdullah Al-Majid, Assem Barakat, Hazem A Ghabbour, Hoong-Kun Fun, Mohammed Rafiq Hussain Siddiqui, Yahia Mabkhot   +6 more
core   +1 more source

Ultrasound assisted synthesis of tetrahydrobenzocxanthene-11-ones using CAN as catalyst [PDF]

, 2012
Tetrahydrobenzocxanthenes-11-ones was synthesized by a three component reaction of α-naphthol, aromatic aldehyde and dimedone. Ceric ammonium nitrate acts as a suitable eco-friendly catalyst for this method.
Pasha, M.A., Sudha, S.
core   +2 more sources