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Willoughby, C. A.; Buchwald, S. L. J. Org. Chem. 1993, 58, 7627. For leading references on the use of late transition metals in the asymmetric hydrogenation of imines, see: Burk, M. J.; Feaster, J. E. Am. Chem. Soc. 1992, 114, 6266.
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For leading references on the asymmetric hydrogenation of 1,1-disubstituted olefins using titanocene derivatives, see: Halterman, R. L.; Vollhardt, K. P. C. Organometallics 1988, 7, 883. Halterman, R. L.; Vollhardt, K. P. C.; Welker, M. E.; Blaser, D.; Boese, R. J. Am. Chem. Soc. 1987, 109, 8105.
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Broene, R. D.; Buchwald, S. L. J. Am. Chem. Soc. 1993, 115, 12569. For leading references on the asymmetric hydrogenation of 1,1-disubstituted olefins using titanocene derivatives, see: Halterman, R. L.; Vollhardt, K. P. C. Organometallics 1988, 7, 883. Halterman, R. L.; Vollhardt, K. P. C.; Welker, M. E.; Blaser, D.; Boese, R. J. Am. Chem. Soc. 1987, 109, 8105.
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For reviews of asymmetric hydrogenation, see: (a) Ojima, I., Ed.; VCH: New York
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For reviews of asymmetric hydrogenation, see: (a) Takaya, H.; Ohta, T.; Noyori, R. In Catalytic Asymmetric Synthesis; Ojima, I., Ed.; VCH: New York, 1993; pp 1-39.
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manuscript in preparation (a more thorough discussion of the proposed mechanism will be presented in this paper).
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Willoughby, C. A.; Buchwald, S. L., manuscript in preparation (a more thorough discussion of the proposed mechanism will be presented in this paper).
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Willoughby, C.A.1
Buchwald, S.L.2
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45949119372
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Based on a detailed study by Parker and Taylor on determining enantiomeric excesses by adding O-acetylmandelic acid to amines, we estimate the error of our enantiomeric excess values to be ±2%. For details, see:
-
Based on a detailed study by Parker and Taylor on determining enantiomeric excesses by adding O-acetylmandelic acid to amines, we estimate the error of our enantiomeric excess values to be ±2%. For details, see: Parker, D.; Taylor, R. J. Tetrahedron 1987, 43, 5451.
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Parker, D.1
Taylor, R.J.2
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33845280542
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For a study of other chiral acids used to determine optical purity of amines, see:
-
For a study of other chiral acids used to determine optical purity of amines, see: Benson, S. C.; Cai, P.; Colon, M.; Haiza, M. A.; Tokles, M.; Snyder, J. K. J. Org. Chem. 1988, 53, 5335.
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For a review of determining enantiomeric purity using NMR, see:
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For a review of determining enantiomeric purity using NMR, see: Parker, D. Chem. Rev. 1991, 91, 1441.
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