Thioureas as new chiral ligands for the asymmetric hydroformylation of styrene with rhodium(I) catalysts

Add time:07/26/2019    Source:sciencedirect.com

Various new chiral thioureas have been synthesized and used as ligands for the asymmetric hydroformylation of styrene catalyzed by rhodium(I) complexes. The best results were obtained with N-phenyl-N′-(S)-(1-phenylethyl)-thiourea associated to a cationic rhodium(I) precursor, and asymmetric induction of 40% was then achieved. As enantioselectivity is obtained with low conversions, various parameters have been examined in order to increase the catalytic activity without the loss of asymmetric induction.

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