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Register a new userPreparation and Characterization of new Knoevenagel condensation products of isophthalaldehyde and terephthalaldehyde with some active methylene compounds
تحضير منتجات جديدة و توصيفها بتكاثف كنوڤيناغل لإيزوفتال ألدهيد و ترفتال ألدهيد مع بعض المركبات المتيلنية الفعالة
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Damascus University ورقة بحثية
Publication date
2013
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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حضرنا ستة منتجات جديدة بتكاثف كنوڤيناغل لإيزوفتال ألدهيد و ترفتال ألدهيد مع المركبات المتيلنية الفعالة الآتية: نتريل المالون و سيانو خلات المتيل و سيانو خلات الإتيل و مالونات ثنائية المتيل و مالونات ثنائية الإتيل، و حددنا الشروط المثلى للتفاعل في بعض الحالات بدراسة تأثير طبيعة المحل و الوسيط و الشروط في التكاثف.
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 malonate. We determined the optimum conditions of the reaction by studying the effect of solvent and catalyst nature and reaction conditions on the condensation.
References used
Jones. G. 1967. Organic Reactions., J. Wiley (vol.15), New York, 204-599
Tielze. L., Beifuss. U. 1991. Comprehensive Organic Synthesis., pergamon press: Oxford (vol.2), 341-394
Jones. G. 2004. “The Knoevenagle condensation”., J. Wiley Inc
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Four model caramelisation products (CPs) have been prepared by heating
different Saccharides solutions (glucose, fructose, lactose and xylose) at 100°C
for 3 hours at different pH( 2.5, 4, 7 and 10). Both Browning and intermediate
thermal degradat
ion products {the caramelisation products} were studied using
ultraviolet /visible spectrophotometer. Generally, the results showed that CPs
increased with increasing heating time, and the formation rate depends upon
the type of Saccharides and pH value. The reducing power of the four distinct
CPs was defined, also. Among all the Saccharides tested, fructose CPs exhibited
the highest reducing power values in alkaline solutions. Finally, the
concentration changes of Saccharides during heating were quantitatively
defined by using high performance liquid chromatography HPLC.
Quinaldine includes shifting hydrogenes which might be involved in
important reactions as the condensation and Mannich reactions.
Quinophtalone has been prepared through the reaction of quinaldine with
phtalyic anhydride in the presence of alumini
um chloride anhydrous
Imines derivatives have been prepared through the reaction of
Quinophtalone with hydroxideamine and phenyl hydrazine and then
diazotion anyhydride has been done to the resulting compounds.
The prepared compounds were characterized by ( H1NMR,IR, MS)
The main properties(yield of juice, total soluble solid, pH, total acidity, total
sugars), some antioxisant compounds as (vitamin C, carotenoids, total phenol,
anthocyanins), and antioxidant activity measured by DPPH method for some
main Syrian or
ange cultivars (navel, valancia, blood orange, and shamouti)
were investigated. The results showed that valancia was the highest in juice
yield (55.16%), while navel had the highest content of carotenoids(8.68mg/100g)
and the lowest one of vitamin C(31.53mg/100g). Whereas, blood orange was
superior in its content of total phenolic (295.73 mg gallic acid100/g) and
antioxidant activity, (74.833%) among the studied cultivars.
This research was conducted at the Faculty of Agriculture, Department of
Food Science laboratories to isolate lactic acid bacteria from some Syrian milk
products (milk, yogurt, cheese) and determine some morphological,
physiological characteristic and the ability of these isolates to ferment sugars.
macrocyclic hydrazone Schiff base was synthesized by reaction of
succinicdihydrazide, Adipicdihydrazide with acetylacetone, adipicdihydrazide
with terephtaldialdehide and sebacicdihydrazide with terephtaldialdehide.
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