Tanyeli, Cihangir
The reaction of 1,3-dicarbonyl compounds with methyl 2-carbomethoxy-3-(N-methylanilino)acrylate under acidic condition directly gives substituted 2H-pyran-2-ones in good yield.


Oxidative dehydrogenation of ethane over a monolith coated by molybdenum-vanadium-niobium mixed-oxide catalyst
Karamullaoglu, G; Doğu, Timur (2003-10-01)
Oxidative dehydrogenation of ethane to ethylene was investigated using Mo0.71V0.21N0.08 mixed-oxide catalyst. in powder form and coated over a monolith. At 570degreesC and with a feed stream containing an O-2/C2H6 mole ratio of one. ethylene selectivity value reaching to 96% was obtained Lit a conversion level of about 5% with the monolith-supported catalyst. DRIFTS studies indicated the presence of adsorbed ethoxide species. The proposed reaction scheme for the production of ethylene includes the eliminati...
FLORESCA, R; KURIHARA, M; WATT, DS; DEMIR, A (American Chemical Society (ACS), 1993-04-09)
Sodium periodate is a better reagent than sodium bismuthate, manganese dioxide, or lead tetraacetate for the cleavage of unsaturated alpha-ketols and affords omega-oxo-alpha,beta-unsaturated acids in good yield. The combination of this cleavage reaction and a rhodium(I)-mediated decarbonylation of omega-oxo-alpha,beta-unsaturated esters derived from polycyclic systems provided an enantioselective synthesis of cyclic systems bearing contiguous quaternary centers where one of the centers possessed gem-dimethy...
Potassium permanganate/carboxylic acid/organic solvent: a powerful reagent for enone oxidation and aryl coupling reactions
Demir, Ayhan Gürbüz (2008-06-30)
The alpha'-acetoxylation of enones and the alpha-acetoxylation of aromatic ketones were carried out with potassium permanganate and acetic acid, in which acetoxylation products were obtained in 74-96% yields. The same reaction was carried out with carboxylic acids other than acetic acid, which furnished corresponding acyloxy ketones with the same regioselectivity. For the first time, formyloxylation products were synthesized in a 61-85% yield by using formic acid. The potassium permanganate and acetic acid ...
Oxidation of Primary Alcohols to Aldehydes with N-Halamine-Containing Polymers
Akdağ, Akın; Öztürk, Perihan (Georg Thieme Verlag KG, 2013-11-12)
Polymeric N-halamines have been previously employed for organic reactions such as sulfide oxidation. In the present study, we employed polymeric N-halamines to oxidize primary alcohols selectively to the corresponding aldehydes in excellent yields. After reaction, the polymers can be recycled and then reused for the next reaction process.
A bis-Lewis basic 2-aminoDMAP/prolinamide organocatalyst for application to the enantioselective synthesis of Warfarin and derivatives
IŞIK, Murat; Akkoca, H. Ufuk; Akhmedov, I. Mecidoglu; Tanyeli, Cihangir (Elsevier BV, 2016-06-01)
A new chiral sec-amine/amidine-base hybrid catalyst, 2-aminoDMAP/prolinamide, is reported, which is able to catalyze conjugate addition of 4-hydroxycoumarin and various benzylideneacetones, a reaction that directly gives anticoagulant Warfarin and its analogues, with good yields (70-87%) and enantioselectivities (58-72%).
Citation Formats
C. Tanyeli, O. OZARSLAN, I. MECIDOGLU, and O. TARHAN, “ACID-CATALYZED ALPHA-PYRONE RING FORMATION REACTIONS,” HETEROCYCLES, pp. 1705–1715, 1994, Accessed: 00, 2020. [Online]. Available: