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Register a new userKnoevenagel condensation of 5-substituted furan-2-carboxaldehyde with Indan-1,3-dione
تكاثف نوفيناجيل لبعض مشتقات الفورفورال مع الاندان-1,3-دايون
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Damascus University ورقة بحثية
Publication date
2012
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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حضرت سلسلة جديدة من المركبات الحلقية غير المتجانسة من 2 _ (5 – معوض -فورفورلدين) _ أندان _1,3 _ ديون بواسطة تكاثف مشتقات الفورفورال مع مركب الاندان 3,1_ديون، وصفت المركبات المحضرة بتعيين درجات انصهارها و بمطيافيات IR ،UV ،NMR-H.
A series of new heterocyclic compounds of2-(5-substituted-furfurylidene)- Indane-1,3-dione, were prepared and identified by their melting points, Infrared, Ultraviolate, and Nuclear magnetic resonance spectra.
References used
Sebti S., Rhihil A., Saber A. (1995). ChemInform Abstract: Natural Phosphate and Sodium Phosphate: Novel Solid Catalysts for Knoevenagel Condensation in Heterogeneous Medium. ChemInform,26(19),9
(a)Sebti S., Rhihil A., Saber A.,Hanafi N., (1996). Natural phosphate doped with potassium fluoride and modified with sodium nitrate: efficient catalysts for the Knoevenagel condensation.tetrahedron letters, (37), 6555; (b) Sebti S., Rhihil A.,Saber A., Laghrissi M., Boulaajaj S. (1996). efficient catalysts for the Knoevenagel condensation. tetrahedron letters, (37), 3999,;(c) Sebti S., Boukhal H., Hanafi N Boulaajaj S. (1999)-tetrahedron letterst,(40),6207)
Anastas P., Warner J. (1998). Green Chemistry: Theory and Practice. Oxford University Press: Oxford
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six new products using Knoevenagel condensation of isophthalaldehyde and
terephthalaldehyde have been prepared with the following active methylene
compounds: malononitrile, methyl cyano acetate, ethyl cyano acetate, dimethyl
malonate and diethyl m
alonate. We determined the optimum conditions of the
reaction by studying the effect of solvent and catalyst nature and reaction
conditions on the condensation.
3-acetylpentane-2,4-dione (AD) was synthesized and characterized using
elemental analysis and IR spectroscopy, in order to examine it as an extractant
for recovery of titanium from aqueous acidic media. Various factors, which
affect recovery proce
dure as nature of acids, titanium concentration, acid
concentration, type of diluents, and interfering ions, have been studied. It is
shown to be a very effective extractant for titanium (IV) from perchloric acid
medium, however, the time of extraction is very long (10 min). The extraction
of titanium is independent of the initial metal ion concentration. Regarding
competition among impurity metal ions, iron (III) seems to be the most
competitive ion which could be avoided using fluoride ions as masking agent.
The stripping of titanium was investigated using mixtures of 0.50 M NaF and
0.10 NaCl. The stripping procedure was very fast and the yield was 99.71%.
The results of this investigation suggest that, it’s highly recommended to use
the synthesized compound as extractant for titanium ions from its acidic media.
Biomimetic oxidations at active sites of iron proteins involve peroxides, especially
hydrogen peroxide which is a strong and very convenient reagent since it is inexpensive
and does not release any toxic by-products. In many cases however, mother N
ature uses
molecular dioxygen to carry out major oxidation reactions in particularly attractive
conditions. The biomimetic interest of iron complexes in the tris(2-pyridylmethyl)amine
series TPA is no longer to demonstrate. We prepared various α-substituted TPA-based
ligands with the idea to modulate the electronic properties at the metal centre. We then
checked the reactivity of a one example of complexes towards molecular dioxygen.
The 1,3-dipolar cycloaddition of the aryl azide and some its of derivatives with cyclohex-
2-en-1-one was studied theoretically using different methods of Density Functional
Theory (DFT): B3LYP, B3PW91, MPW1PBE, MPW1PW91 and M062X with the basic
s
et 6-31g(d). Most of the used levels of theories provide closed results qualitatively, and
the results of the level of theory M062X / 6-31g (d) show that these reactions in the gas
state are spontaneously to form two products, but all the reactions are very slow and one of
the products P1 is more spontaneous and faster than the other P2 , and when these
reactions were studied with different solvents, it is found that solvents to have no actual
effects on the rates of these reactions.
The results of the level of theory M062X / 6-31g (d) indicate that the Gibbs free energy of
the reactions for the substitutes of Aryl increases in negative values in order of 2,6-Cl, -4
NO2, 4-OCH3, 3-OCH3, 3-Cl, 2 -Cl, H-; i.e., the substitutes do not have a significant
effect on the spontaneity of reactions compared to the substitute-H. It was observed that
TS-P1 transition state energy for all substitutes was lower than TS-P2 transition state
energy.
Hetrocyclic compounds 5-(5-R-2-Furfurlidene)– barbituric acid were
obtained and their physical and chemical properties were studied. Their
structures were identified by spectoroscopic methods. This study proved by
1H-NMR Spectroscopy data that these compounds exist in S-cis form.
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