Preparation and Coupling Reactions of Alkynyl(phenyl)iodonium Salts Bearing Long Alkoxy Chains. Formation of Liquid-Crystalline Diacetylenes
作者:Tsugio Kitamura、Chi Han Lee、Hiroshi Taniguchi、Masaru Matsumoto、Youich Sano
DOI:10.1021/jo00105a022
日期:1994.12
Alkynyl(phenyl)iodonium tosylates with long alkoxy chains, such as (octyloxy)-, (decyloxy)-, (dodecyloxy)-, and (tetradecyloxy)phenyl, were prepared by reaction of the corresponding alkynes with hydroxy(tosyloxy)iodobenzene. The alkynyliodonium tosylates were allowed to react with alkynylcopper reagents (p-RC(6)H(4)C=C)(2)Cu(CN)Li-2, where R = MeO, Me, H, Br, CN, and NO2. The coupling reaction proceeded under mild conditions to provide unsymmetrical and symmetrical diacetylenes. The selectivity of the formation of these diacetylenes was dependent on the substituent on the alkynylcopper reagents. The diacetylenes prepared in this study displayed liquid-crystalline properties.