Synthesis of the first 1,3-disubstituted 1,3-butadienyl heteroannular bridged [4]ferrocenophane

Article abstract of DOI:10.1016/j.jorganchem.2010.12.032

An unusual heteroannular cyclization of methyl 4-(((1′- (trimethylsilyl)ethynyl)ferrocenyl)ethynyl)benzoate (11) under the basic desilylation condition yielded 1,1′-(l-methoxy-3-(4′- (methoxycarbonyl)phenyl)-1,3-butadienylene)ferrocene (7), the first repo