Synthese of new thiophenes having various perfluorinated alkyl groups attached via alkyl spacers to the 3-position are described. These compounds are potential monomers for the electrosynthesis of new organic conductors.
Synthesis of Well-Defined Head-to-Tail-Type Oligothiophenes by Regioselective Deprotonation of 3-Substituted Thiophenes and Nickel-Catalyzed Cross-Coupling Reaction
作者:Shota Tanaka、Shunsuke Tamba、Daiki Tanaka、Atsushi Sugie、Atsunori Mori
DOI:10.1021/ja205953g
日期:2011.10.26
realized by regioselective metalation of 3-substituted thiophenes with the Knochel-Hauser base (TMPMgCl·LiCl) and coupling with bromothiophene using a nickel catalyst. Treatment of 3-hexylthiophene with TMPMgCl·LiCl induces metalation at the 5-position selectively. Subsequent addition of 2-bromo-3-hexylthiophene and a nickel catalyst leads to the corresponding bithiophene. The obtained bithiophene is
A polythiophene comprising, for example, a repeating segment of the formula
1
wherein R′ is CF
3
, alkoxy, or alkyl; and y and z represent the number of repeating segments.
一种聚噻吩,例如由以下式子的重复段组成
1
其中 R′为 CF
3
、烷氧基或烷基;y 和 z 代表重复段的数目。
C-H Arylation of 3-Substituted Thiophene with Regioselective Deprotonation by TMPMgCl·LiCl and Transition Metal Catalyzed Cross Coupling
The reaction of 3-hexylthiophene with Knochel-Hauser base (TMPMgCl center dot LiCl) induced the metalation at the 5-position of the thiophene ring selectively. Following addition of several aryl halides in the presence of a nickel or palladium catalyst afforded regioselectively arylated thiophene in good to excellent yields.