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  • Küçük Resim
    Öğe
    The Di-π-methane Photorearrangement of 2,3-Disubstituted Benzobarrelenesand Benzonorbornadiene 2 Substituent Effects in Regioselectivity
    (Wiley-VCH Verlag, 2002) Altundaş, Ramazan; Daştan, Arif; Ünaldi, Nermin S.; Güven, Kutalmış; Uzun, Orhan; Balcı, Metin
    2,3-Disubstituted benzobarrelene and benzonorbornadiene derivatives 16, 17, and 18, containing electron-withdrawing and electron-donating substituents, have been synthesized and subjected to triplet-sensitized photoisomerization. Methyl 3-methyl-2-benzobarrelenecarboxylate (16) gave two di-?-methane rearrangement products. However, methyl 3-cyano-2-benzobarrelenecarboxylate (17) underwent an intramolecular [2? + 2?] cycloaddition reaction, whilst methyl 3-cyano-2-benzonorbornadienecarboxylate (18) formed dimer 40. The formation of these products is discussed in terms of the radical stabilizing effect of the substituents and the destabilizing effect on the formation of cyclopropane ring.
  • Küçük Resim
    Öğe
    Plastic behaviour of Fe-Mn binary alloys
    (Elsevier, 2005) Aytar, Büşra; Uzun, Orhan; Aktürk, Selçuk; Ekinci, A. E.; Şahin, Osman; Düzgün, B.; Uçar, Nebahat
    The plastic deformation behaviour of binary Fe-Mn alloys with Mn content in the range 0.42 - 1.21% has been investigated in tensile tests performed at different temperatures and strain rates. The results show that the temperature and the strain rate introduce opposite effects on the, stress-strain curves. On the other hand, the stress-strain response of the Fe-Mn binary alloys is sensitive to the Mn content. Obviously there is a linear increase of the yield stress with increasing Mn content due to solid solution hardening.