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Syntheses of Donor–Acceptor-Substituted 2,6-Stellanes

✍ Scribed by Gerd Fritzsche; Rolf Gleiter; Hermann Irngartinger; Thomas Oeser

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
225 KB
Volume
1999
Category
Article
ISSN
1434-193X

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✦ Synopsis

A number of condensations could be carried out using 5 yielded mono-and disubstituted products, among them were the donor-acceptor-substituted 2,6-stellanes 33-35. The tricyclo[3.3.0. 0 3,7 ]octane-2-one (stellanone, 4) andtricyclo-[3.3.0.0 3,7 ]octane-2,6-dione (2,6-stelladione, 5) as starting structures of 18 (prepared from stellanone and fluorene), 19, 24, 27, 31 and 32 (synthesized by condensation of 2,6-materials. The components for condensations were 2trimethylsilyl-1,3-dithiane ( 6), 1,1-bis(trimethylsilyl)-1H-stelladione and 2-trimethylsilyl-1,3-dithiane and malononitrile, respectively) were determined by X-ray cyclopropa[b]naphthalene (7), its 3,6-dimethoxy-substituted analogue 8, fluorene (12), xanthene (13), diethyl malonate crystallography. ( 14), and malononitrile (15). The condensation reactions with

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## Abstract Five oligo(2,5‐thienyleneethynylene) series (OTE, __n__ = 1–5), namely the push‐pull substituted compounds **1b**‐**5b** and **1c**‐**5c**, the purely donor substituted compounds **1a**‐**5a** and two precursor series with protected and deprotected ethynyl end‐groups, respectively, were