Unusual condensation of 3-Thia[5](1,1')ferrocenophane-1,5-dione with glyoxal. Formation of [1.1](2,3)thiopheno(1,1')ferrocenophane-1,7-dione.
When 3-thia [5](1,1')ferrocenophane-1,5-dione 2 was condensed with glyoxal in the presence of sodium ethoxide, a thiophene-2,3-diyl derivative 3 was obtained as a sole product, instead of the expected 2,5-substituted compound 1.
Miyahara
Yuji
Y
Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. miyahscc@mbox.nc.kyushu-u.ac.jp
Nishimura
Emi
E
Sugimura
Takashi
T