Introduction
In connection with material sciences related research (e.g.: substrates for oligo- and polymerisation to conductive
materials and NLO-precursors) we now were interested in synthesizing some new spacer-linked
thiophenes suitable as substrates and key intermediates.
Strategy:
- Syntheses of parent structures according or analogous to literature
- Selective brominations of substrates thus obtained
Scheme 1
- Transformation of latter compounds via halogen dance reactions with concomitant
introduction of electrophiles to access targets as depicted below:
Scheme 2
- Ring opening reactions lead to highly conjugated Enynes:
Scheme 3