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Comopund rac- 3 is reasonably priced when purchased in >100g quantities from Dalchem/ABCR (<10$/g). Alternatively, it can be prepared in good quantities from the corresponding alcohol, see
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Comopund rac- 3 is reasonably priced when purchased in >100g quantities from Dalchem/ABCR (<10$/g). Alternatively, it can be prepared in good quantities from the corresponding alcohol, see:, A. Miyashita, H. Takaya, T. Souchi, R. Noyori, Tetrahedron 1984, 40, 1245.
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For synthesis and structural features of its diphosphine counterpart, see
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78651233646
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Both (1R,2S,5R)-(-)-menthyl (S)-p-toluenesulfinate and (1S,2R,5S)-(+)-menthyl (R)-p-toluenesulfinate can be purchased in high deratio from various chemical suppliers
-
Both (1R,2S,5R)-(-)-menthyl (S)-p-toluenesulfinate and (1S,2R,5S)-(+)-menthyl (R)-p-toluenesulfinate can be purchased in high deratio from various chemical suppliers.
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99
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78651256917
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The protocol reported in the Supporting Information of this manuscript gives superior yields of p-Tol-BINASO compared to the procedures given in reference [12a] and reference [16a]
-
The protocol reported in the Supporting Information of this manuscript gives superior yields of p-Tol-BINASO compared to the procedures given in reference [12a] and reference [16a].
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-
-
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100
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30944458592
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-
Ortho-metallation of sulfoxides is well-documented and sometimes directs the reaction outcome to undesired products, for example
-
Ortho-metallation of sulfoxides is well-documented and sometimes directs the reaction outcome to undesired products, for example:, R. J. Kloetzing, P. Knochel, Tetrahedron: Asymmetry 2006, 17, 116.
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78651245865
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note
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The crystal structures of ligands 19a and 19c show that these compounds are not enantiopure as expected (see purity of starting sulfinate 10). The major isomer was determined indirectly by HPLC and the catalytic results (see: reduction to disulfides and enantiomeric purity of ligands) to have the S,S-configuration at the sulfur centers. Likewise, ligand 23b contains the R,R-configured isomer as the major component.
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78651255778
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The disulfides 24 - 31 were subjected to identical reaction conditions as for their synthesis using elevated temperatures (up to 100°C) and extended reaction times (up to 2 days). No change in enantiomeric ratios was found as determined by HPLC analysis
-
The disulfides 24-31 were subjected to identical reaction conditions as for their synthesis using elevated temperatures (up to 100°C) and extended reaction times (up to 2 days). No change in enantiomeric ratios was found as determined by HPLC analysis.
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108
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53849117146
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The other isomers of ligands 16-23 did not form clean complexes of the corresponding dimers and (DNHS)-conformers of the ligands were not used in our study. Our hypothesis is that steric repulsion from the sulfoxide groups hinders formation of the bridged complexes, a phenomenon that was also observed for atropisomeric diphosphine ligands incorporating bulky aromatic groups on phosphorus atoms, see:, T. Ohshima, H. Tadaoka, K. Hori, N. Sayo, K. Mashima, Chem. Eur. J. 2008, 14, 2060.
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78651249546
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I complexes, donor-acceptor properties of diphosphines have been investigated by studying the carbonyl stretching frequencies of [(diphosphine)RhCl(CO)] compounds, see
-
I complexes, donor-acceptor properties of diphosphines have been investigated by studying the carbonyl stretching frequencies of [(diphosphine)RhCl(CO)] compounds, see
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117
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20544472257
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The differences in average stretching frequencies are big enough to exclude misinterpretation, owing to different bite angles (and resulting geometry/orbital overlap differences) between the complexes. For stretching frequencies of other rhodium-dicarbonyl complexes with chelating diphosphine ligands, see, for example:, T. A. Betley, J. C. Peters, Angew. Chem. 2003, 115, 2487
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I than diphosphines, but merely reflect the relative contributions of donor and accepting properties of different ligand families. For a recent computational analysis on the subject, see:, D. G. Gusev, Organometallics 2009, 28, 763.
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For discussions on the effect of dihedral angles on selectivity and reactivity, see for example
-
For discussions on the effect of dihedral angles on selectivity and reactivity, see for example
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A recent report on the use of modified atropisomeric diphosphines as ligands for rhodium-catalyzed 1,4-addition in toluene/water has come to similar conclusions, see
-
A recent report on the use of modified atropisomeric diphosphines as ligands for rhodium-catalyzed 1,4-addition in toluene/water has come to similar conclusions, see:, T. Korenaga, K. Osaki, R. Maenishi, T. Sakai, Org. Lett. 2009, 11, 2325.
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78651237788
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A similar effect has been proposed for conjugated additions with rhodium quinonoid catalysts, see
-
A similar effect has been proposed for conjugated additions with rhodium quinonoid catalysts, see
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78651255156
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Details of DFT calculations are included in the Supporting Information
-
Details of DFT calculations are included in the Supporting Information.
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-
-
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133
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33748169771
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For DFT calculations on a related 1,4-addition-enantioselective protonation reaction, see
-
T. Itoh, T. Mase, T. Nishikata, T. Iyama, H. Tachikawa, Y. Kobayashi, Y. Yamamoto, N. Miyaura, Tetrahedron 2006, 62, 9610. For DFT calculations on a related 1,4-addition-enantioselective protonation reaction, see
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135
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78651238820
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note
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-1 higher than the barrier for the direct transfer from the water molecule to the substrate, supporting the low energy mechanism pathway shown in Figure8.
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