[2] (a) C.G. Frost, J. Howarth, J.M.J. Williams, Tetrahedron Asymmetry 1992, 3, 1089-1122. (b) T. Hayashi in Catalytic Asymmetric Synthesis, I. Ojima (Ed.), VCH, Weinheim, 1993, pp 325-365.

[3] G. Consiglio, R.M. Waymouth, Chem. Rev. 1989, 89, 257.

[4] (a) D. Mueller, G. Umbricht, B. Weber, A. Pfaltz, Helv.Chim. Acta 1991, 74, 722-240.(b) U. Leutenegger, G. Umbricht, C. Fahrni, P. von Matt, A. Pfaltz, Tetrahedron 1992, 48, 2143;(c) P. von Matt, G.C. Lloyd-Jones, A.B.E. Minidis, A. Pfaltz, L. Macko, M. Neuburger, M. Zehnder, H. Ruegger, P.S. Pregosin, Helv. Chim. Acta 1995, 78, 265-284.

[5] B.M. Trost, D.L. Van Vranken, C. Bingel, J. Am. Chem. Soc. 1992, 114, 9327-9343.

[6] T. Hayashi, A. Yamamoto, Y. Ito, E. Nishioka, H. Miura, K. Yanagi, J. Am. Chem. Soc. 1989, 111, 6301.

[7] (a) R.D. Adams, D.F. Chodosh, J.W. Faller, A.M. Rosan, J. Am. Chem. Soc. 1979, 101, 2570. (b) K.-H. Chao, J.W. Faller, J. Am. Chem. Soc. 1983, 105, 3893;(c) J.W. Faller, K.-H. Chao, H.H. Murray, Organometallics 1984, 3, 1231-1240.

[8] E. Cesarotti, F. Demartin, M. Grassi, L. Prati, J. Chem. Soc. Dalton Trans. 1991, 2073-2082.

[9] J. Sprinz, G. Helmchen, Tetrahedron Lett. 1993, 1769-1772.

[10] P. von Matt, A. Pfaltz, Angew. Chem. Int. Ed. Engl. 1993, 32, 566.

[11] (a) G.J. Dawson, C.G. Frost, J.M.J. Williams, S.J. Coote, Tetrahedron Lett. 1993, 34, 3149; (b) S.J. Coote, G.J. Dawson, C.G. Frost, J.M.J. Williams, Synlett, 1993, 509-510.

[12] J.M. Brown, D.I. Hulmes, P.I. Guiry, Tetrahedron, 1994, 50, 4493.

[13] T.G. Gant, A.I. Meyers, Tetrahedron 1994, 50, 2297-2360.

[14] H. Vorbrueggen, K. Krolikiewics, Tetrahedron 1993, 49, 9353-9372, and earlier work cited therein.

[15] A full paper on this work is in preparation: M. Peer, J.C. de Jong, M. Kiefer, Th. Langer, H. Rieck, P. Sennhenn, J. Sprinz, H. Steinhagen, B. Wiese, G. Helmchen, to be published.

[16] A. Pfaltz et al., in press.

[17] J.V. Allen, S.J. Coote, G.J. Dawson, C.G. Frost, C.J. Martin, J.M.J. Williams, J. Chem. Soc. Perkin Trans. 1 1994, 2065, and literature cited therein.

[18] H. Witte, W. Seeliger, Liebigs Ann. Chem. 1974, 996-1009.

[19] This approach to obtain oxazolinophosphines was indepedently developed by our group and the Williams group[11b].

[20] J.W. Faller, M.E. Thomsen, M.J. Mattia, J. Am. Chem. Soc. 1971, 93, 2642.

[21] B. Bosnich, P.B. Mackenzie, Pure Appl. Chem. 1982, 54, 189.

[22] J. Sprinz, M. Kiefer, G. Helmchen, M. Reggelin, G. Huttner, O. Walter, L. Zsolnai, Tetrahedron Lett. 1994, 1523.

[23] (a) P. R. Auburn, B. Bosnich, P. B. Mackenzie, J. Am. Chem. Soc. 1985, 107, 2033-2046; (b) B. M. Trost, P.E. Strege, L. Weber, T.F. Fullerton, T. J. Dietsche, J. Am. Chem. Soc. 1973, 95, 8200-8201.

[24] We have prepared a crystal of the corresponding cyclohexenyl complex which contains the molecule with a phenyl group directly on top of the allylic C-2. Unfortunately, the quality of the crystal did not allow determination of the structure with high precision. Our x-ray crystallographer, Dr. L. Zsolnai, Heidelberg, does not allow us to publish this structure. In solution at least two conformers with respect to the biphenylyl group are present, according to an NMR investigation by Dr. M. Reggelin, Frankfurt.

[25] B.M. Trost, R.C. Bunt, J. Am. Chem. Soc. 1994, 116, 4089.

[26] G. Knühl, P. Sennhenn, G. Helmchen, submitted.

[27] P. von Matt, O. Loiseleur, G. Koch, A. Pfaltz, C. Lefeber, T. Feucht, G. Helmchen, Tetrahedron: Asymmetry 1994, 5, 573.

[28] H. Rieck, G. Helmchen, to be published.

[29] H. Eichelmann, H.-J. Gais, Tetrahedron Asymmetry 1995,6,443-446.

[30] G. Helmchen, G. Nill, Angew. Chem. 1979, 91, 66; Angew. Chem. Int. Ed. Engl. 1979, 18, 65.

[31] P. Sennhenn, B. Gabler, G. Helmchen, Tetrahedron Lett. 1994, 8595.

[32] K. Mislow, I.V. Steinberg, J. Am. Chem. Soc. 1955, 57, 3807.

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