“Push–pull” 2-ferrocenyl-4-hydroxythiazoles: A novel method of the construction of the thiazole ring
摘要:
The title compounds were obtained by cyclization of ferrocenyl thioimidates in the presence of sodium ethoxide. They were transformed into the corresponding 4-acetoxy-derivatives in reaction with acetic anhydride/pyridine. The structure of 4-acetoxy-5-(ethoxycarbonyl)-2-ferrocenylthiazole was determined by X-ray diffraction. The EFISH measurements revealed significant second-order nonlinear properties of 4-acetoxy-2-ferrocenyl-5-(4-nitrophenyl)ferrocenylthiazole (mu beta = 250 x 10(48) esu at 1907 nm). (C) 2008 Elsevier B. V. All rights reserved.