Alternating copolymers phosphorus

Analogously to ethylene-carbon monoxide copolymers, alternating copolymers between cycloolefins such as norbornene and carbon monoxide have been synthesised using cationic Pd(II) complexes modified by phosphorus ligands such as [Pd(MeCN)n(PPh)4 J[BF4]2( = 1,2,3) [27]. General requirements for the... 

As an example, the alternating copolymerization of 2-phenyl-l,3,2-dioxaphospholane (81a) can be used. Thus, the copolymerization of structure 81a with acrylic acid (87) and with p-propiolactone (88) gives the same alternating copolymer (90). The M-A reaction is responsible for the appearance of the tetracoordinated phosphorus. The zwitterion 89 is assumed to be identical in both cases. 

In the case of copolymerization of vinylphosphonic acid monoethyl ester (92) with cyclic phosphonites (86), the alternating copolymer (93) having two kinds of phosphorus atoms in the main chain was formed. During the copolymerization, monomer 92 was reduced involving a hydrogen-transfer process and monomer 86 was oxidized the oxidation state of the phosphorus atom of monomer 86 changed, therefore, from trivalent to pentavalent ( oxidation-reduction copolymerization ). ... 

Kiji and co-workers [87] investigated the composition and microstructure of alternating olefin-carbon monoxide copolymers and their derivatives including ethylene-styrene-carbon monoxide alternating polymer, norbornene-amine copolymer and polymers modified with phosphorus pentasulfide or phosphorus pentoxide or primary amines. 

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