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• W2011108210 startingPage "2073" @default.
• W2011108210 abstract "The chiral complexes [Pd(η3-allyl)(P–P′)]X [P–P′= the chiral chelating ligand (S)(N-diphenylphosphino)(2-diphenylphosphinoxymethyl)pyrrolidine; allyl = MeCHCHCHMe, 2; or PhCHCHCHPh 3; X = BF4– or PF–6] have been prepared and analysed by NMR spectroscopy. Their diastereoisomeric composition have been determined on the basis of 1H, 13C, 31P and two-dimensional 1H–X (X =13C or 31P) correlation NMR spectra. Since retention of the preferred syn disposition of the allylic substituents occurs in both cases the reaction product is a mixture of two isomers which differ in allylic chirality. The relative absolute configurations have been assigned by two-dimensional nuclear Overhauser effect measurements and confirmed by the X-ray crystallographic determination of the structure of the major diastereoisomer of 2: the allyl fragments have (1S,3R) absolute configuration. The reaction of racemic 1,3-dimethylprop-2-enyl acetate in the presence of 2 and of 1,3-diphenylprop-2-enyl acetate in the presence of 3 with sodium dimethyl malonate gives the allylic alkylation products in 20 and 30% enantiomeric excess respectively." @default.
• W2011108210 created "2016-06-24" @default.
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• W2011108210 date "1991-01-01" @default.
• W2011108210 modified "2023-09-23" @default.
• W2011108210 title "Nuclear magnetic resonance and crystallographic studies of chiral η³-allyl palladium(<scp>II</scp>) complexes and asymmetric allylic alkylation of propen-2-yl acetates" @default.
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• W2011108210 doi "https://doi.org/10.1039/dt9910002073" @default.
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