Additions and corrections

Facile and selective synthesis of aldehyde end-functionalized polymers using a combination of catalytic chain transfer and rhodium catalyzed hydroformylation

Niels M. B. Smeets, Jan Meuldijk, Johan P. A. Heuts and Ard C. J. Koeken

Polym. Chem., 2010, 1 (DOI: 10.1039/c0py00111b). Amendment published 9th July 2010.

Some of the references were cited in correctly in the original paper. The correct citations are shown in the paragraph below:

The reported hydroformylation of the pMMA, pS and p(S-co-AMS) macromonomers, using a [Rh(CO)₂acac]/L1 catalyst, allows for the preparation of aldehyde functionalized polymers with nearly complete conversion, high selectivity and pre-determined structural positioning of the aldehyde functional group. Moreover, since CO₂ is used as a solvent and CO and H₂ as reactants, isolation of the polymer product is expected to be straightforward. As CO, H₂, and CO₂ are gases at room temperature and atmospheric pressure, only small amounts of these gases will stay dissolved in the hydroformylated product after depressurization. Although this has not been attempted yet, using CO₂ to extract the catalyst after the hydroformylation could be another advantageous aspect of the method presented here. It is known that L1 has a significant solubility in scCO₂.^50,60 There are studies on the extraction of L1 from polymers using scCO₂.^60,61 The rhodium complex modified with L1 has proven to have a sufficient solubility in scCO₂ to carry out very efficient hydroformylation catalysis.⁵⁰ Therefore, in particular in the case of the higher molecular weight hydroformylation products it is to be expected that extraction with CO₂ will allow for subsequent separation of L1 and rhodium from the hydroformylated polymer product. To enhance the extraction of rhodium with CO₂ one could think of adding quantities of CO and H₂ in order to convert all rhodium species into HRh(CO)₄. Based on previous findings on hydroformylation catalysis in CO₂ in our laboratory and by others, HRh(CO)₄ should have a good solubility in CO₂.^50,52,62,63

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

Back to article