The present paper reports on the systematic hydrolysis kinetic studies of the monomer N-vinylbenzylidene-3-aminopyridine Im and its corresponding copolymers Cpa and Cpb. These studies were established in homogeneous media with pH range from 4 to 10 using UV-Vis spectrophotometer for analysis. The experimental kinetic constants were calculated and a hydrolysis mechanism was proposed. The pH-rate diagram profile was also determined for the monomer and copolymers.
K. Diaf, Z. El Bahri, N. Chafi, A. Mesli, N. Besbes
3-aminopyridine, monomer, copolymer support, hydrolysis mechanism, kinetic, Schiff base.
A new variety of 1,4-oxazines was prepared by the reaction of cyanoesters epoxides or α-chlorocyanohydrins with 2-aminoethanol. The condensation was carried out under mild conditions at room temperature and at very suitable reaction times with good yields.
M. Saadouni, T. Ghailane, S. Boukhris, R. Ghailane, N. Habbadi, A. Hassikou, A. Souizi
Epoxides, cyanhydrins, α-chlorocyanhydrins, 1,4-oxazines
New rearrangements of 3-ethoxycarbonyl iminocoumarin into benzopyrano[2,3-c]pyrazole under the action of various hydrazines and hydrazides as N-nucleophiles, were described. The structures of all the synthesized products were characterized by IR, 1H NMR, 13C NMR and elemental analysis.
N. Abid-Jarraya, H. Turki-Guermazi, H. Ammar, S. Abid, R. El Gharbi
Iminocoumarin, benzopyrano[2,3-c]pyrazole, hydrazide, hydrazine
Synthesis of a series of cyclic fused-isoxazolines has been accomplished by regioselective and chemioselective 1,3-dipolar cycloaddition of ethyl 1-allyl-2-benzyl-3-oxo-2, 3-dihydro-1H-isoindole-1-carboxylates 5 to arylnitrile oxides 6. The structure of the cycloadducts was elucidated by 1H and 13C NMR spectroscopy. The regioselectivity observed is in accordance with the one normally found in nitrile oxide cycloaddition with terminal alkenes.
A. Laouiti, M.M. Rammah, M. Askri, M.B. Rammah
The salt C16H20ClFN2O2 crystallizes in the monoclinic system, space group P21/c. The parameters of the unit cell are: a = 6.038(1) Å, b = 20.140(1) Å, c = 14.180(1) Å, β = 101,00(1)° and Z = 4. The structure is built up from (C16H20FN2O2)+ cations and Cl- anions linked by N-H..Cl hydrogen bond. The organic cation has a benzyl group linked to the ammonium group (NH2)+ which is attached to a 2,3-disubstituted five membered ring.
F. Saâdi, F. Ben Amor, A. Arfaoui, A. Driss, H. Amri
Natural dye extracted from Rhus pentaphylla bark was applied on wool and silk fabrics by an exhaustion dyeing process. Aluminum, tannic acid, and stannous chloride were used as mordants. The dyeing was conducted with and without metallic salt mordants, using three different mordanting methods: pre-mordanting, meta-mordanting, and post-mordanting. A large variety of pale to dark reddish-brown color shades was obtained. The color of each dyed material was scrutinized in terms of the CIELAB (L*, a* and b*) and (K/S) values. The color fastness to washing, rubbing, perspiration, and light of the dyed samples was determined according to ISO standards methods. Optimum results were obtained when dyeing with 7g of the dye at pH 2, a temperature of 100°C during 60 minutes for both wool and silk fibers. Dyeing fastness had mostly been good to very good level with the exception of the fastness to light which was medium.
H. Ghouila, W. Haddar, M. Ben Ticha, N. Baaka, N. Meksi, M.F. Mhenni, H. Ben Jannet
Rhus pentaphylla, tannins, natural dyeing, wool, silk, mordanting