Abstract
Oligothiophene sulfones of up to six rings can be conveniently prepared by the direct oxidation of butyl-substituted thiophene oligomers with m-CPBA in dichloromethane. Reverse selectivity of oxidized rings is observed relative to previously reported systems without β-substitution. The selectivity in the trimer and hexamer is confirmed with single-crystal X-ray structure data. The sulfones possess red-shifted absorptions and increased electron affinities relative to the parent oligomers.
Original language | English (US) |
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Pages (from-to) | 3721-3724 |
Number of pages | 4 |
Journal | Organic Letters |
Volume | 9 |
Issue number | 19 |
DOIs | |
State | Published - Sep 13 2007 |