Nine kinds of monosubstituted ferrocene derivatives, omega-[4-(4-methoxyphenoxycarbonyl)phenoxycarbonyl]alkyl 4-ferrocenylbenzoate, were prepared. The derivatives containing 4, 6, 10 and 11 carbon atoms in the flexible alkyl chain of the compounds showed liquid crystallinity, and multiple melting behavior was observed in the compounds containing 4, 6 and 11 carbom atoms. An appearance of the liquid crystallinity showed a carbon number dependence on the flexible alkyl chain.