Fouad Malek

Synthesis and X-Ray Structure of (N,N-Bis(3,5-dimethylpyrazol- 1-ylmethyl)-1-hydroxy-2-aminoethane)(3,5-dimethylpyrazole) copper(II) dinitrate

The tridentate ligand N,N-Bis(3,5-dimethylpyrazol-1-ylmethyl)-1-hydroxy-2-aminoethane (L) has been prepared in one step by condensation of two equivalents of 1-hydroxymethyl-3,5-dimethylpyrazole with one equivalent of 2-aminoethanol. This reaction is carried out under microwave irradiation (60 W) in the absence of solvent for 20 min [1]. Using this ligand L a new Cu(II) dinitrate complex has been prepared. The single-crystal X-ray structure of the title compound, [N,N-bis(3,5-dimethylpyrazol-1-ylmethyl)-1-hydroxy-2-aminoethane] (3,5-dimethylpyrazole)copper(II) dinitrate, revels that the copper (II) ion is coordinated to two pyrazole nitrogens, one tertiary amine nitrogen of the ligand L and 3,5-dimethylpyrazole, and in the apical position by an alcohol O atom.

Pyrazolic tripods synthesis and cation binding properties

The synthesis of two new bipyrazolic tripods with different functionalised arms is described. The complexing properties of these compounds towards heavy metal ions (Hg2+, Cd2+, Pb2+) and alkaline metal ions (K+, Na+, Li+) were studied by a liquid–liquid extraction process and the extracted cation percentage was determined by atomic absorption measurements.

Water soluble and fluorescent copolymers as highly sensitive and selective fluorescent chemosensors for the detection of cyanide anions in biological media

We report a simple colorimetric method based on a water soluble polymer (WSP) for the sensitive and selective detection of cyanide in a biological solution. The WSPs were prepared from a radical polymerization of a methacrylate with a cyanide chemosensor moiety based on a coumarin–dicyano-vinyl derivative motif, and the polymer was then rendered water soluble by copolymerizing this hydrophobic monomer with other glyco-conjugated methacrylate derivatives. The lowest concentration for the quantification of cyanide ions was 0.05 μM, and the polymer exhibited nearly no calorimetric response to the presence of other common anions. Therefore, the chemical incorporation of some carbohydrates, as lactose or its usual monosaccharide moieties (glucose, lactose), represents a new method for the implementation of polymers for the detection of cyanide anions in water, exhibiting both good selectivity and efficiency.

1-(4-{[(3,5-dimethyl-1H-pyrazol-1-yl)methyl] amino} phenyl) ethanone

A mixture of (3,5-dimethyl-1H-pyrazol-1-yl)methanol 1 [1] (1.86 g, 14.8 mmol) and 4-amino-acetophenone 2 (1g, 7.4 mmol) in acetonitrile (50 mL) was stirred in a closed vessel at room temperature for 6 days [2,3,4].[...]

2-{bis[(1,5-dimethyl-1H-pyrazol-3-yl)methyl]amino}ethanol

To a mixture of 3-chloromethyl-1,5-dimethylpyrazole 1 [1] (6g, 41mmol) and sodium carbonate (17g, 160mmol) in 150 mL of acetonitrile was added slowly 2-aminoethanol 2 (1.25g, 20.5 mmol).[...]

3-methyl-1-[3-(3-methyl-2-oxobutylidene)-1,4-dihydro-6-methyl-quinoxalin-2-ylidene]butan-2-one.

To a solution of 3,8-dihydroxy-2,9-dimethyl deca-3,7-diene-5,6-dione 2 [1] (452 g, 2 mmol) in absolute ethanol (15 mL) was added the 4-methylorthophenylenediamine 1 (244 mg, 2 mmol) and the mixture was refluxed for 90 min [2].[...]

2-[-3-(2-(4-methylphenyl)-2-oxoethylidene)-1,4-dihydro- quinoxaline-2(1H)-ylidene]-1-(4-methylphenyl) ethanone

The product 3 was prepared by the condensation of dienone 2 [1] (1g, 3.1 mmol) with 3,4-diaminotoluene 1 (0.38 g, 3.1 mmol) by refluxing an ethanol (50 mL) solution for 1 h.[...]

4-{[(3,5-dimethyl-1H-pyrazol-1-yl)methyl]amino}benzoic acid

A mixture of (3,5-dimethyl-1H-pyrazol-1-yl)methanol 1 [1] (1.84 g, 14.6 mmol) and 4-aminobenzoic acid 2 (1g, 7.3 mmol) in acetonitrile (50 mL) was stirred in a closed vessel at room temperature for 6 days [2,3,4].[...]

2-[3-(2-Oxo-2-phenylethylidene)-1,4-dihydro-6-methyl Quinoxalin-2-ylidene]-1-phenyl Ethanone

To a solution of dienone 2 [1] (1 g, 3.4 mmol) in absolute ethanol (20 mL) was added 4-methyl o-phenylenediamine 1 (0.41 g, 3.4 mmol) and the mixture was refluxed for 1 hour [2, 3].[...]