Toward Silicon-Catenated Silole Polymers, Poly(1,1-silole)s: Syntheses and Structures of Oligo(1,1-silole)s (SYNTHETIC ORGANIC CHEMISTRY-Synthetic Design)

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A series of 1,1-difunctionalized siloles have been synthesized from 1,1-diaminosiloles, which have been prepared via the intramolecular reductive cyclization of diaminobis(phenylethynyl)silane. With the 1,1- difunctionalized siloles in hand, oligo(1,1-silole)s, silole oligomers catenated through silicons, have been synthesized as model compounds of poly(1,1-silole)s. UV absorption spectra of the oligosiloles have been determined, in which tersilole and quatersilole have unique absorption maxima around 280-290 nm.