Über polyarylenalkenylene und polyheteroarylenalkenylene, 11. Synthesen von poly(1,4‐phenylenvinylen), poly(2,5‐thiophendiylvinylen) und poly(2,5‐furandiylvinylen) aus methylsubstituierten aldehyden

By means of the strong base sodium tert ‐butoxide p ‐tolylaldehyde ( 1a ), 5‐methyl‐2‐thiophene carboxaldehyde ( 1b ), and 5‐methyl‐2‐furancarboxaldehyde ( 1c ) can be polycondensed in dimethylformamide to give poly(1,4‐phenylenevinylene) ( 2a ), poly(2,5‐thiophenediylvinylene) ( 2b ), and poly(2,5‐furandiylvinylene) ( 2c ). 2a and 2b are also available from the Schiff's bases of 1a and 1b . The polymers are identical with polymers synthesized via the Wittig reaction. The vinylene units have the trans ‐configuration.