Warnier/orr methodology for information systems development and an application.

El-den, A. Jamel


Cassirer's conception of objectivity and scientific knowledge
Doğan, Aysel; Ergüden, Akın; Department of Philosophy (1995)
Darzens Reaction of Acyl Phosphonates with alpha-Bromo Ketones: Selective Synthesis of cis- and trans-Epoxyphosphonates
Demir, Ayhan Sıtkı; Emrullahoglu, Mustafa; Pirkin, Eser; Akca, Nazmiye (American Chemical Society (ACS), 2008-11-21)
Acyl phosphonates with alpha-halo ketones in the presence of bases at room temperature afford cis- and trans-epoxyphosphonates in good chemical yields and high selectivities using different bases. The diastereoselectivity of this reaction is easily controlled by changing the base. Changing the base from CS(2)CO(3) to DBU changed the diastereomeric ratio (trans/cis) from 3/2 to 9/1. Moreover, the treatment of the trans isomer with DBU showed a complete conversion to the corresponding cis isomer.
Darzens reaction of substituted alfa-bromo acetophenones with acyl phosphonates
Pirkin, Eser; Demir, Ayhan Sıtkı; Department of Chemistry (2008)
Phosphorous containing small cycles are very important building blocks in organic and medicinal chemistry. Many of their derivatives, especially cyclopropyl- and 1,2- epoxypropylphosphonates, have attracted great attention due to the broad spectrum of their biological properties including antiviral, anticancer, antibiotic, antibacterial, pesticidal, insecticidal and enzyme inhibitory activities. The Darzens condensation is one of the most potential methodologies for the preperation of α,β-epoxy carbonyl com...
Beauville structures in finite p-groups
Fernandez-Alcober, Gustavo A.; Gul, Sukran (2017-03-15)
We study the existence of (unmixed) Beauville structures in finite p-groups, where p is a prime. First of all, we extend Catanese's characterisation of abelian Beauville groups to finite p-groups satisfying certain conditions which are much weaker than commutativity. This result applies to all known families of p-groups with a good behaviour with respect to powers: regular p-groups, powerful p-groups and more generally potent p-groups, and (generalised) p-central p-groups. In particular, our characterisatio...
Painleve classification of coupled Korteweg-de Vries systems
Karasu, Emine Ayşe (1997-07-01)
In this work, we give a classification of coupled Korteweg-de Vries equations. We found new systems of equations that are completely integrable in the sense of Painleve. (C) 1997 American Institute of Physics.
Citation Formats
A. J. El-den, “Warnier/orr methodology for information systems development and an application.,” Middle East Technical University, 1987.