Synthesis of 2-ferrocenylidene-4-cyclopentene-1,3-diones

Zora M. , KÖKTÜRK M., Eralp T.

TETRAHEDRON, cilt.62, sa.44, ss.10344-10351, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 62 Konu: 44
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.tet.2006.08.078
  • Dergi Adı: TETRAHEDRON
  • Sayfa Sayıları: ss.10344-10351


A squarate-based synthesis of 2-ferrocenylidene-4-cyclopentene-1,3-diones is described. When refluxed in dioxane at 100 degrees C, heated with silica gel as a solvent free grinded solid mixture at 125 degrees C or stirred with silica gel in ethyl acetate at room temperature, 4-ferrocenylethynyl-4-hydroxy-2-cyclobutenones, prepared from ethynylferrocene and 3-cyclobutene-1,2-diones, afforded 2-ferrocenylidene-4-cyclopentene-1,3-diones as the major or single product of the reaction. In some cases, ferrocenyl quinones also resulted from these reactions as the minor products. The major or exclusive formation of 2-ferrocenylidene-4-cyclopentene-1,3-diones is attributed to the radical-stabilizing ability of the ferrocenyl group.. (c) 2006 Elsevier Ltd. All rights reserved.