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Cluster-derived rhodium catalysts, prepared from salts of the cluster anion [Rh 12 (CO) 30 ] 2− supported on silica, have been studied in ethylene hydroformylation. A catalyst pre-treatment was carried out in Ar at 393 K before the admission of the hydroformylation mixture. The selectivity for propanal formation depends on the alkaline countercation in the following order:...
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