Xantphos, investigations with

Similar results were recently published for the continuous-flow gas-phase hydroformylation of propene [51]. This time, the supported system was prepared by direct impregnation of an unmodified silica gel with methanol solution containing [Rh(CO)2(acac)j, the ligand, and the IL. The sulfonated xantphos used in this investigation must be added in large excess (10-20 equiv. per Rh) to afford the expected selectivity for the linear aldehyde n/i = 16.9). The performance of the optimized catalytic support remains stable up to 5 h before a decrease in activity and selectivity was observed. This work was also completed using other ligands derived from the series developed in classical biphasic IL systems, and applied to the continuous hydroformylation of propene and 1-octene [52]. 

In 2015, Behr s group investigated the hydroformylation of 1,3-pentadiene (piperylene) (Scheme 4.12) [79]. With a Xantphos-based rhodium catalyst, mainly /Z-2-methylpent-2-enal was obtained. By running the reaction in... 

Selective hydroformylation of propene and 1-decene at the terminal carbon has been accomplished with the highest levels of activity and selectivity ever reported using [Cp Ru] complexes with bisphosphite or bisphosphine ligands as catalysts. The reaction mechanism was investigated using stoichiometric amounts of [Cp Ru(Xantphos)H] and [Dj]-1-decene. ... 

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