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Sequence-defined oligo(ortho-arylene) foldamers derived from the benzannulation of ortho(arylene ethynylene)s.


ABSTRACT: A Cu-catalyzed benzannulation reaction transforms ortho(arylene ethynylene) oligomers into ortho-arylenes. This approach circumvents iterative Suzuki cross-coupling reactions previously used to assemble hindered ortho-arylene backbones. These derivatives form helical folded structures in the solid-state and in solution, as demonstrated by X-ray crystallography and solution-state NMR analysis. DFT calculations of misfolded conformations are correlated with variable-temperature 1H and EXSY NMR to reveal that folding is cooperative and more favorable in halide-substituted naphthalenes. Helical ortho-arylene foldamers with specific aromatic sequences organize functional ?-electron systems into arrangements ideal for ambipolar charge transport and show preliminary promise for the surface-mediated synthesis of structurally defined graphene nanoribbons.

SUBMITTER: Lehnherr D 

PROVIDER: S-EPMC5450445 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Sequence-defined oligo(<i>ortho</i>-arylene) foldamers derived from the benzannulation of <i>ortho</i>(arylene ethynylene)s.

Lehnherr Dan D   Chen Chen C   Pedramrazi Zahra Z   DeBlase Catherine R CR   Alzola Joaquin M JM   Keresztes Ivan I   Lobkovsky Emil B EB   Crommie Michael F MF   Dichtel William R WR  

Chemical science 20160708 10


A Cu-catalyzed benzannulation reaction transforms <i>ortho</i>(arylene ethynylene) oligomers into <i>ortho</i>-arylenes. This approach circumvents iterative Suzuki cross-coupling reactions previously used to assemble hindered <i>ortho</i>-arylene backbones. These derivatives form helical folded structures in the solid-state and in solution, as demonstrated by X-ray crystallography and solution-state NMR analysis. DFT calculations of misfolded conformations are correlated with variable-temperatur  ...[more]

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