Abstract
Abstract 1,2-{4,4′-Di[S(-)-2-methylbutyloxy]phenyl}acetylene and 1-(4-n-alkoxyphenyl)-2-{4′-[S(-)-2-methyl butyloxyl]phenyl}acetylene monomers were prepared by a one pot phase transfer Pd(O)/Cu(I) catalyzed three step coupling of the appropriate aryl halides with 2-methyl-3-butyn-2-ol. 1,2-{4,4-Di[S(-)-2-methylbutyloxy]phenyl}acetylene is crystalline. The 1-(4-n-alkoxyphenyl)-2-{4′-[S(-)-2-methylbutyl- oxy]phenyl)acetylenes with n=8–10 present enantiotropic cholesteric mesophases, and those with n = 11, 12 present monotropic cholesteric mesophases. The chiral derivative with n = 6 is crystalline with either a second crystalline phase or a highly ordered monotropic smectic mesophase.
Published Version
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