Abstract
Synthetic efforts toward cross-conjugated enyne oligomers are
detailed in this account. This includes the realization of iso -polydiacetylenes (iso -PDAs)
and iso -polytriacetylenes (iso -PTAs), the cross-conjugated constitutional
isomers of polydiacetylenes and polytriacetylenes, respectively.
These compounds can be readily accessed via palladium-catalyzed
cross-coupling reactions between vinyl triflates and terminal alkynes,
or oxidative acetylenic coupling of terminal alkynes using Hay methodology.
Electronic communication along the π-framework of these
oligomers is described as a function of both oligomer length and
terminal substitution.
1 Introduction
2 iso -Polydiacetylenes
3 iso -Polytriacetylenes
and Beyond
4 Donor-Acceptor Derivatives of Cross-Conjugated Enynes
5 Conclusions and Perspectives
Key words
cross conjugation - enynes - conjugated oligomers - structure-function studies - alkynes
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