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2 has also been used to highlight the dimeric nature of this palladacycle.
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34247531301
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During the preparation of this manuscript, a model for the enantio-selectivity of COP-Cl-catalysed rearrangement of trichloroacetimidates was reported. See
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During the preparation of this manuscript, a model for the enantio-selectivity of COP-Cl-catalysed rearrangement of trichloroacetimidates was reported. See: M. P. Watson, L. E. Overman, R. G. Bergman, J. Am. Chem. Soc. 2007, 129, 5031-5044.
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38049117859
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Ratios: 2a (1:0), 2b (1:0.7), 2c (1:0.7), 2d (1:0.3), 2e (1:0), 2f (1:0), Isomer mixtures (cis/trans. also referred to as synlanti) are a feature of many bridged palladacycles.
-
Ratios: 2a (1:0), 2b (1:0.7), 2c (1:0.7), 2d (1:0.3), 2e (1:0), 2f (1:0), Isomer mixtures (cis/trans. also referred to as synlanti) are a feature of many bridged palladacycles.
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38049175047
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Acetonitrile has been used with catalyst 4 (1 mol% loading) but only at 50°C: see reference [8b].
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Acetonitrile has been used with catalyst 4 (1 mol% loading) but only at 50°C: see reference [8b].
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Examples of palladium-catalysed addition of nucleophiles to alkenes that proceed by means of cis palladation have recently been reported. Oxygen nucleophiles; a T. Hayashi, K. Yamasaki, M. Mimura, Y. Uozumi, J. Am. Chem. Soc. 2004, 126, 3036-3037;
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It has been noted that addition of an excess of silver trifluoroacetate to an iodide-bridged ferrocene oxazoline palladacycle results in the formation of a ferrocenium cation, see reference [3k
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It has been noted that addition of an excess of silver trifluoroacetate to an iodide-bridged ferrocene oxazoline palladacycle results in the formation of a ferrocenium cation, see reference [3k].
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66
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38049144726
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a values for the conjugate acids of 2-methyloxazoline and imidazole are 5.5 and 7.75 respectively, see: a M. A. Weinberger, R. Greenhalgh, Can. J. Chem. 1963, 41, 1038-1041;
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For a statistical distribution of S,pR/S,pR (R,R) R,PS/R,pS (S,S) and 5,pR/R, pS (R,S) dimers (K, 4, eeaux, 50% gives EEprod, 55, EE, extrapolated enantiomeric yield) with g, 0.5 (g, kRS/kRR, Alternatively, for g, 0 an EEprod of 54% is calculated with eeaux, 50% if the component of the meso (R,S) diastereoisomer is 20, See: D. Guillaneux, S.-H. Zhao, O. Samuel, D. Rainford, H. B. Kagan, J. Am. Chem. Soc. 1994, 116, 9430-9439
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aux = 50% if the component of the meso (R,S) diastereoisomer is 20%. See: D. Guillaneux, S.-H. Zhao, O. Samuel, D. Rainford, H. B. Kagan,. J. Am. Chem. Soc. 1994, 116, 9430-9439.
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38049177904
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Models for the origin of enantioselection have been proposed in which the alkene component of the allylic imidate substrate is coordinated cis to the metallocene.[3m,11] This is compatible with a mechanism in which initial coordination of the substrate is followed by isomerisation to the thermodynamic cis isomer, as presumably is also the case with phosphine adducts 3
-
[3m,11] This is compatible with a mechanism in which initial coordination of the substrate is followed by isomerisation to the thermodynamic cis isomer, as presumably is also the case with phosphine adducts 3.
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