Abstract
Chiral ferrocene-containing iminoarylphosphite ligands based on 4,4′-dimethoxy-6,6′-di-tert-butyl-biphenyldiol-2,2′ and their chelate complexes with Rh(I) and Pd(II) were synthesized for the first time. They were shown to be perspective reagents in the reactions of asymmetric allyl substitution. The Pd-catalyzed alkylation of 1,3-diphenylallylacetate with dimethyl malonate results in a 87% enantiomer excess (ee), while in sulfonylation of 1,3-diphenylallylacetate with sodium para-toluenesulfinite, this figure amounts to 67%. The results obtained were compared with coordination and catalytic efficiency of a less sterically hindered ferro-cenyliminophosphite based on pyrocatechol. The compositions and structures of new compounds were determined by the 1H, 13C, 31P NMR, IR, mass spectrometry (EI, FAB, and electrospray techniques), and elemental analysis.
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Gavrilov, K.N., Tsarev, V.N., Lubimov, S.E. et al. Complexation and Pd-Catalyzed Asymmetric Allylation with Participation of Chiral Ferrocenyliminophosphites. Russian Journal of Coordination Chemistry 30, 685–691 (2004). https://doi.org/10.1023/B:RUCO.0000043891.44863.9e
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DOI: https://doi.org/10.1023/B:RUCO.0000043891.44863.9e