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El Ali, B.1
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41
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0038076018
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and references therein
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(h) Ohno H., Hamaguchi H., Ohata M., Tanaka T. Angew. Chem., Int. Ed. 42:2003;1749-1753. and references therein.
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Ohno, H.1
Hamaguchi, H.2
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Tanaka, T.4
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44
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85030920098
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note
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Other chiral ligands, i.e. (R)-BINAP type ligands, proved less effective in the reaction of 1a with 5b , and only gave 15% ee, in low product yield and conversion. When (R)-DIOP was used, the product was isolated in good yield and conversion, but no enantiodiscrimination was found. However, no reaction occurred when chiral ligands DuPHOS was used as chiral ligands. Use of 1b as the substrate, and other (R)-Tol-BINAP, (R)-BINAP or (-)-Me-DuPHOS as chiral ligands, gave no reaction with 5b . Chiral ligands such as (R,R)-DIOP, (S,S)-BDPP and (R,R)-BPPM can give the product in 12-33% yields but in 0% ee.
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45
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85030924063
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note
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Crystallographic data (excluding structure factors) for the structure 6d in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC 219150. Copy of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [fax: +44-1223-336033 or e-mail: deposit@ccdc.cam.ac.uk].
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