for the synthesis of fluorene and its derivatives starting from 2-iodobiphenyls and CH2Br2. A range of fluorene derivatives can be synthesized under relatively mild conditions. The reaction proceeds via a tandem palladium-catalyzed dual C–C bond formation sequence through the key dibenzopalladacyclopentadiene intermediates, which are obtained from 2-iodobiphenyls through palladium-catalyzed C–H activation
Reactive medium for electrochromic display devices and electrochromic display including such reactive medium
申请人:International Business Machines
Corporation
公开号:EP0004291A2
公开(公告)日:1979-10-03
This invention relates to a composition for use as a reactive medium in a reversible electrochromic display device. The reactive medium is placed between two electrically conductive electrodes of the device, at least one of the electrodes being transparent, the composition includes an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor, and the oxidant is a substituted fluorene compound.