Preparation of Functionalized Organometallic Metal–Metal Bonded Dimers Used in the Synthesis of Photodegradable Polymers

Synthesis of Main‐Chain Metal Carbonyl Organometallic Macromolecules (MCMCOMs)

“…The Tyler group has made a great effort to develop chemistry for the synthesis of MCMCOMs with metal‐metal bonds along the polymer's backbone . This type of polymer is photochemically degradable as the metal‐metal bonds are relatively weak, and they can be cleaved by visible light…”

“…However, the metal‐metal bond is labile, which imposes challenges for the synthesis . To address this challenge, two synthetic routes have been developed . As shown in Figure , the dimers can be prepared starting from the functionalization of the Cp ring and metal coordination before creating the metal‐metal bond.…”

“…Synthetic routes for the preparation of (η 5 ‐C 5 H 4 R) 2 Mo 2 (CO) 6 and (η 5 ‐C 5 H 5 ) 2 Mo 2 (CO) 4 (PPh 2 R) 2 containing a Mo‐Mo bond with a functional group R on the Cp ring (a) and coordinated phosphine (b). Reproduced with permission . Copyright 2009, Springer…”

“…Examples of functionalized monomers containing a metal‐metal bond. Reproduced with permission . Copyright 2009, Springer.…”

“…The cleavage of the metal‐metal bond during the polymerization process was also observed under certain conditions. For example, polycondensation of 1 and diacyl chloride resulted in the formation of metal halide complex instead of the targeted polyesters (Figure ) …”