The title compound, C(17)H(13)ClO(2), was obtained from the oxidation of 6-chloro-4-(2-phenyl-ethen-yl)chroman-2-ol, which was synthesized by the reaction of of (E)-3-(5-chloro-2-hy-droxy-phen-yl)acryl-aldehyde with styrylboronic acid using diethyl-amine as a catalyst. The six-membered pyran-one ring of the chromane system has a screw-boat conformation. The dihedral angle between the least-squa...

Sodium bis(2-ethylhexyl) sulfosuccinate (AOT) is well known to form nanometre sized aqueous droplets in organic solvents and used in several contemporary applications including templates of nanoparticle synthesis. However, the detailed structural characterization of AOT in aqueous media is relatively less attended. Here we have used dynamic light scattering technique for the structural characte...

A catalytic amount of tin(IV) chloride catalyzed formal [4+2] cycloaddition reaction of di-tert-butyl 2-ethoxycyclobutane-1,1-carboxylate with ketones or aldehydes to give diethyl 6-ethoxydihydro-2H-pyran-3,3(4H)-dicarboxylates, whereas two equivalents of trimethylsilyl triflate promoted tandem [4+2] cycloaddition and lactonization to afford 3-oxo-2,6-dioxabicyclo[2.2.2]octane-4-carboxylate est...

A novel donor-?-acceptor fluorescent dye as a chemosensor for Cu2+ ions is herein presented. The fluorophoric core consists of 3,5-diphenyl-dicyanomethylene-4H-pyran (DCM), with extended styryl chains on positions 2 and 6, bearing terminal di-(2-picolyl)amine (DPA) groups metal coordination. Optical characterization the reveals an absorption maximum at ca. 500 nm strong bathochromic shift in em...

Electrochemical synthesis suggested a mild, green and atom-efficient route to interesting useful molecules, thus avoiding harsh chemical oxidizing reducing agents used in traditional synthetic methods. Organic electrochemistry offers an excellent alternative conventional methods of organic creates modern tool for carrying out synthesis, including cascade multicomponent ones. In this research, n...

Abstract Background : It is a practice to use traditional medicine for curing various illnesses in West Africa. Acacia hebecladoides , albida and Gmelina arborea were selected based on their belief treating ailments such as: hallucinations, inflammation tuberculosis. The study sought validate the antitubercular activity, antioxidant properties phytochemical components of extracts fractions leav...

a simple, efficient, and high yielding one-pot protocol has been developed for the synthesis of 4h-benzo[b]pyrans scaffolds installing a three-component tandem knoevenagel-cyclocondensation reaction of an aldehyde, malononitrile and dimedone using guanidinium chloride as polyfunctional organocatalyst under solvent-free conditions in high to excellent yields. various aromatic aldehydes were util...