Polymer modifications hydroformylation

Other modification reactions of unsaturated polymers which have been reported include phosphonylation, hydration via hydroboration, nitromercuration (by phase-transfer catalysis)/" hydroformylation/ hydrogenation/ reactions with... 

Hydroformylation involves the reaction of C=C bonds with syngas (i.e., a mixture of carbon monoxide and hydrogen) and produces aldehyde functional groups. Hydroformylation of diene-based polymers is mostly performed by means of providing sites for further derivations. The most commonly explored secondary modification of aldehyde functional groups is hydrogenation to give primary alcohol functionality however, aldehyde may also be converted to nitrile, acetate, or amine functionalities. " ... 

In a later report, Im-Erbsin and coworkers explored hydroformylation for chemical modifications of ultrahigh-molecular-weight (>2,000,000 g/mol) d5-l,4-PBD. The only catalyst investigated was HRh(CO)(PPh3)3. Under conditions of 70 °C and 5.5 MPa syngas pressure for 10 h, 80% of the C=C bonds in PBD were converted to formyl groups (Fig. 5C). Similar conversions were achieved by Chen and coworkers under comparable reaction conditions for the hydroformylation of SBR (Fig. 5B). However, no post-hydroformylation polymer molecular-weight information was provided for either reaction system. 

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