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- W2894594945 abstract "Two chiral diphosphites, (S,S)-5,17-bis(1,1′-binaphthyl-2,2′-dioxyphosphanyloxy)-25,26,27,28-tetrapropyloxycalix[4]arene (1) and (S,S)-5,11-bis(1,1′-binaphthyl-2,2′-dioxyphosphanyloxy)-4(24),6(10),12(16),18(22)-tetramethylenedioxy-2,8,14,20-tetrapentylresorcin[4]arene (2), each based on a conical cavity, were synthesised and assessed in the rhodium-catalysed hydroformylation of vinyl arenes. Under optimised conditions, both ligands led to high proportions of branched aldehyde (b/l = 8.1) in the hydroformylation of styrene. The observed enantioselectivity was considerably higher for 1 than 2 (ee 89% vs. 50%), this being consistent with the easy formation of chelated intermediates with 1 (chelate formation is prevented with 2), in which the embracing ligand enables an efficient chirality transfer to the catalytic centre." @default.
- W2894594945 created "2018-10-12" @default.
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- W2894594945 date "2019-01-01" @default.
- W2894594945 modified "2023-09-27" @default.
- W2894594945 title "Chiral calixarene and resorcinarene derivatives. Conical cavities substituted at their upper rim by two phosphito units and their use as ligands in Rh-catalysed hydroformylation" @default.
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- W2894594945 doi "https://doi.org/10.1016/j.catcom.2018.09.020" @default.
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