| abstract |
An improved method for producing disubstituted 9-alkylidenefluorenes or structurally similar compounds, and their oligomers or (co) polymers. The invention relates to a process for the preparation of disubstituted 9-alkylidenefluorenes and structurally similar compounds, and to novel compounds and intermediates prepared by this process, their use in the preparation of conjugated polymers and copolymers. And the novel polymers and copolymers produced thereby. The process according to the invention offers important advantages in terms of yield, reaction steps and synthesis flexibility, in particular the use of copper catalysts to lower the reaction temperature and reduce the amount of alkyl Grignard reagents. Having. |