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3843073905
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note
-
In this work only bidentate chelating bisphosphines are considered, not P,N- or N,N-donor ligands. Furthermore, complexes with two chelating bisphosphines and phosphine ligands that already contain the coordinating olefins are not taken into account
-
-
-
-
26
-
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3843094599
-
-
note
-
Complexes with achiral ligands (entries 1-8) crystallize in achiral space groups. Consequently, beside complexes with λ-conformation and distortion of the diolefin in a specific direction the enantiomeric δ-conformer via the symmetry element of point mirror with the opposite sense of rotation of the diolefin is present in the crystal. In the table the specification for the diolefin orientation always applies to the λ-conformation
-
-
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28
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84862397839
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Crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited at the Cambridge Crystallographic Data Centre as supplementary publication no, CCDC-236784 for entry 2, CCDC-236785 for entry 3, 236786 for entry 10, 236787 for entry 24, 236782 for entry 32, 236783 for entry 33 (concerning Table 1) and CCDC-163842 for entry 3 (Table 3; Fig. 8). Copies of the data can be obtained, free of charge, on application to The Director, CCDC, 12 Union Road, Cambridge, CB2 1EZ, UK (fax: int. code +44 (1223) 336-033; e-mail: deposit@ccdc.cam.ac.uk ; web, http://www.ccdc.cam.ac.uk)
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30
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31
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3843150138
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note
-
Disorder of COD; positions I and II
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32
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4243071787
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51
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3843067357
-
-
note
-
This trend, however, is not changed by the fact that for examples with several cations in the asymmetric unit partly larger differences in the discussed lengths are observed
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-
-
-
53
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84987460614
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H. Berger, R. Nesper, P.S. Pregosin, H. Rüeger and M. Wörle Helv. Chim. Acta 76 1993 1520 1538
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In this context we refer to a publication by Orpen and Pringel et al. E. Fernandez, A. Gillon, K. Heslop, E. Horwood, D.J. Hyett, A.G. Orpen and P.G. Pringle Chem. Commun. 2000 1663 1664
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56
-
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3843149053
-
-
note
-
Unfortunately, there are not enought structures existing of five-membered ring chelates discussed in this paper that occur with both the diolefins to prove the hypothesis. Additionally, this assertion does not apply to two out of six examples from Table 1 (no 4/5 and 29/30); the NBD complexes of DCPE and BASPHOS, respectively, show slightly larger tetrahedral distortion than the appropriate COD complexes. The reasons for the unexpected behaviour is unclear but in case of BASPHOS the apparently large tetrahedral distortion of 22° is approximately to one half caused by the fact that according to Figure 7 an additional rotation of the NBD around the x-axis appears; the angle between the centre of the phosphorus atoms, rhodium and the centre of the centroids is only 171°
-
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59
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23044526221
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R. Kempe, A. Spannenberg, D. Heller, R. Kadyrov and V. Fehring Z. Kristallogr. 216 2001 157 160
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-
63
-
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3843054318
-
-
note
-
Examples containing more than two cations in the asymmetric unit and in which two of the diolefins each exhibit a contrary direction of rotation are not taken into account: CUQJIV, VAZDUV and SULMUH
-
-
-
-
64
-
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3843117383
-
-
note
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Only these two conformations are distinguished, disturbances of those conformations described in detail in Ref. d are not taken into further consideration
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-
-
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66
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0000868533
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J. Halpern Science 217 1982 401 407
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3843102298
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Personal communication
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Atom coordinates: Landis, C. R. Personal communication
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Landis, C.R.1
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79
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3843135874
-
-
note
-
As a kinetic phenomenon the enantioselectivity is determined as the ratio of the enantiomeric products, from the ratio of reactivity of the diastereomeric substrate complexes as well as the ratio of the concentration of these intermediates and thus is dependent on several possible reaction pathways. The selectivity experimentally obtained is not only the result of the potential of the catalyst intrinsically present and determined by the chiral ligand, but also the result of external parameters such as hydrogen pressure and temperature. In other words, a chiral ligand is a necessary but not sufficient condition for stereoselection
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