Octene isomerization, base catalyzed

In the screening of various monodentate phosphinines for the Rh-catalyzed hydroformylation of 1-octene, the substituted bulky 2,4,6-triphenylphosphinine derivative 35 (Scheme 6.10) was found to show superior performance over classical PPh3-based catalysts. Turnover frequencies of up to 45370 h have been determined (T = 130 °C p = 40 bar CO/H2 Rh L = 1 20), although the selectivity towards the linear product nonanal is low, as anticipated for a monodentate ligand (1/b 2). Nevertheless, complete and rapid consumption of internal octenes, which have been formed by isomerization reaction prior to hydroformylation, occurred, showing the potential of these catalyst systems for the hydroformylation of less-reactive and internal alkenes (Scheme 6.10). 

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