Polymerization of Olefin-Containing Arenes

The first examples of organometallic polymers where an arene was coordinated to the transition metal appeared in the early 1970s. These were reported by Pittman and coworkers. The homopolymerizations and copolymerizations of many acrylate-, methacrylate-, and styrene-substituted arene monomers coordinated to chromiiun tricarbonyl. The copolymerization of the acrylate monomer 56 with 2-ferrocenylethyl acrylate 57 is shown in scheme 18. With the exception 

In instances where the metal atom is connected to CO, the polymers are both organometallic polymers, because of the metallocene connection, and coordination polymers, because of the metal-CO connection. 

The synthesis of polymethacrylates and polystyrenes with cationic cyclopen-tadienyliron moieties coordinated to their sidechains was recently reporfed. The synthesis of cyclopentadienyliron-coordinated polymethacrylates by radical polymerization initiated with AIBN is shown in scheme 19. Organic polymethacrylates 61 a,b were isolated through photolysis of the organometallic polymers 60. The Mw of the organometallic polymer 60 was 22,500, with a polydispersity of 1.4. Electrochemical studies indicated that the metallated polymethacrylates exhibited reversible reduction of the iron centers occurring between E1/2 =1.1 and -1.2 V 

Ring-Opening Metathesis Polymerization of Snbstitnted Norbornenes 

Cationic cyclopentadienyliron-coordinated aryl ethers have been functionalized with norbornenes 62-66 through the condensation reaction of 

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