ISSN:
1436-2449
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Summary 1,4-Bis[2-(4′,4″-diheptyloxyphenyl)ethynyl]benzene and 1,4-bis[2-(3′,3″-dimethyl-4′,4″-diheptyloxyphenyl)ethynyl]benzene were synthesized by a one pot phase transfer Pd(O)/Cu(I) catalyzed three step coupling of 1,4-diiodobenzene with 2-methyl-3-butyn-2-ol and the appropriate aryl halide. Both compounds display mesomorphic behavior similar to that of the analogous 1,2-(4,4′-dialkoxyaryl)acetylenes, except that the temperature window of each phase is stabilized, such that an enantiotropic mesophase is even observed in the derivative containing a methyl branch in the mesogen. Both compounds form mesomorphic EDA complexes with p-chloranil as electron acceptor, and display a depression of the nematic-isotropic transition temperature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00338498
Permalink