نتایج جستجو برای: malononitrile

تعداد نتایج: 663  

Journal: :Synlett 2004

Journal: :Molecules 2010
Hamad M Al-Matar Khaled D Khalil Aisha Y Adam Mohamed H Elnagdi

Pyrano[2,3-c]pyrazoles are obtained via mixing ethyl acetoacetate, hydrazine hydrate, aldehydes or ketones and malononitrile in the absence of solvent. These same products were also obtained by reacting arylidenemalononitriles 3 with 3-methyl-2-pyrazolin-5-ones. NOE difference experiments confirmed that these products exist solely in the 2H form. Similar treatments of 3-amino-2-pyrazolin-5-one ...

Journal: :Australian Journal of Chemistry 1973

Journal: :Organic & biomolecular chemistry 2008
Xiao-Yang Guan Min Shi

A three-component reaction of beta-nitrostyrene, arylmethylidenemalononitrile and malononitrile catalyzed by imidazole produced the corresponding polysubstituted cyclohexene derivatives in moderate to good yields under mild conditions. A further improvement of this three-component reaction has also been achieved by starting from a commercially available aromatic aldehyde, nitromethane and malon...

Journal: :Molbank 2023

The 2-(2,7-bis(pyridin-3-ylethynyl)fluoren-9-ylidene)malononitrile (1) was synthesized by reaction of 2,7-bis(pyridin-3-ylethynyl)fluoren-9-one with malononitrile in DMSO solution. structural characterization 1 SC-XRD analysis accompanied elemental analysis, FT-IR, NMR, and MS measurements.

Journal: :Molecules 2011
Noha M Helmy Fatma E M El-Baih Monirah A Al-Alshaikh Moustafa S Moustafa

The conditions of the reaction of malononitrile dimer with enaminones and arylidenemalononitrile could be adapted to yield either pyridines or benzene derivatives. A new synthesis of pyrido[1,2-a]pyrimidines from the reaction of malononitrile dimer 1 and 2-phenyl-3-piperidin-1-yl-acrylonitrile (11) is described. Compound 1 condensed with DMFDMA to yield an enaminonitrile that reacted with hydra...

Journal: :Molecules 2009
Mehdi Bakavoli Hamid Beyzaie Mohammad Rahimizadeh Hossein Eshghi Reza Takjoo

Cyclocondensation of 2-[bis(methylthio)methylene]malononitrile (1) and cysteamine (2) afforded 2-(thiazolidin-2-ylidene)malononitrile (3). This compound on treatment with NaSH gave the corresponding thioamide derivative 4a in a regioselective manner on the basis of its single crystal X-ray diffraction analysis. Reaction of this compound with several alpha-bromocarbonyl compounds gave new 2-(E)-...

2009
George B. Ettenger Brian Wesley Williams Daniel Brillhart Margaret E. Kastner

In the title complex, C(17)H(12)N(2), the non-aromatic six-membered ring adopts an envelope conformation. The dihedral angle between the eight-membered plane containing the malononitrile group and the aromatic system is 25.88 (4)°. The distance from the central C atom of the malononitrile group to the centroid of the n-glide-related distal aromatic ring is 3.66 Å, suggesting π-π inter-actions.

Journal: :Talanta 1984
D P Zollinger M Bos A M van Veen-Blaauw W E van Der Linden

A procedure is proposed for the determination of malononitrile by differential pulse polarography in methanolic 0.1M tetraethylammonium iodide/0.001M tetramethylammonium hydroxide as the supporting electrolyte. In this medium malononitrile is chemically converted into an electroactive species. With close control of timing of the steps in the procedure the error of the method is +/-1.5% in the c...

2012
Abdel-Zaher A Elassar

Ethyl pyruvate (EP) on reacting with malononitrile or isothiocyanates gives the pyridine derivati ves 5 and 9a , b , respecti vely. Chalcone deri vati ve of EP reacts with malononitrile to yield the pyran derivative which in turn IS transformed into pyridine derivative 14. Reactivity of 5 and 9a towards di fferent organic reagents has been investigated . Antimicrobial activity of some newly syn...

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