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2Zn: a) H. Nehl, W. Scheidt, J. Organomet. Chem. 1985, 289, 1; b) R. Mynott, B. Gabor, H. Lehmkuhl, 1. Doering, Angew. Chem. Int. Ed. Engl. 1985, 24, 335. We assume that the group exchange is slow and that symmetrical species are not formed at the temperatures we used (-78°C) to prepare the mixed zincates.
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2Zn: a) H. Nehl, W. Scheidt, J. Organomet. Chem. 1985, 289, 1; b) R. Mynott, B. Gabor, H. Lehmkuhl, 1. Doering, Angew. Chem. Int. Ed. Engl. 1985, 24, 335. We assume that the group exchange is slow and that symmetrical species are not formed at the temperatures we used (-78°C) to prepare the mixed zincates.
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Mynott, R.1
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18
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0007139912
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For the selectivity of group transfer from mixed zincates to α,β-enones, see ref. [4c-g]. The analogous selectivity of mixed dialkylcuprates is generally not high: a) W. H. Mandeville, G. M. Whitesides, J. Org. Chem. 1974, 39, 400; b) D. E. Bergbreiter, J. M. Killough, ibid. 1976, 41, 2750; c) F. Leyendecker, J. Drouin, J. J. Debesse, J. M. Conia, Tetrahedron Lett. 1977, 1591; d) H. Westmijze, H. Kleijn, P. Vermeer, Synthesis 1978, 454.
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19
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0000701105
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For the selectivity of group transfer from mixed zincates to α,β-enones, see ref. [4c-g]. The analogous selectivity of mixed dialkylcuprates is generally not high: a) W. H. Mandeville, G. M. Whitesides, J. Org. Chem. 1974, 39, 400; b) D. E. Bergbreiter, J. M. Killough, ibid. 1976, 41, 2750; c) F. Leyendecker, J. Drouin, J. J. Debesse, J. M. Conia, Tetrahedron Lett. 1977, 1591; d) H. Westmijze, H. Kleijn, P. Vermeer, Synthesis 1978, 454.
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0343366458
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For the selectivity of group transfer from mixed zincates to α,β-enones, see ref. [4c-g]. The analogous selectivity of mixed dialkylcuprates is generally not high: a) W. H. Mandeville, G. M. Whitesides, J. Org. Chem. 1974, 39, 400; b) D. E. Bergbreiter, J. M. Killough, ibid. 1976, 41, 2750; c) F. Leyendecker, J. Drouin, J. J. Debesse, J. M. Conia, Tetrahedron Lett. 1977, 1591; d) H. Westmijze, H. Kleijn, P. Vermeer, Synthesis 1978, 454.
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84981682355
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For the selectivity of group transfer from mixed zincates to α,β-enones, see ref. [4c-g]. The analogous selectivity of mixed dialkylcuprates is generally not high: a) W. H. Mandeville, G. M. Whitesides, J. Org. Chem. 1974, 39, 400; b) D. E. Bergbreiter, J. M. Killough, ibid. 1976, 41, 2750; c) F. Leyendecker, J. Drouin, J. J. Debesse, J. M. Conia, Tetrahedron Lett. 1977, 1591; d) H. Westmijze, H. Kleijn, P. Vermeer, Synthesis 1978, 454.
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0001572070
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2 complex, where the two bidentate ligands coordinate the externally disposed lithium atoms: H.-O. Froehlich, B. Kosan, B. Undeutsch, H. Goerls, J. Organomet. Chem. 1994, 472, 1.
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3 has been demonstrated: a) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1988, 110, 4834; b) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1989, 111, 1351; c) B. H. Lipshutz, E. L. Ellsworth, S. H. Dimock, ibid. 1988, 110, 4834.
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3 has been demonstrated: a) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1988, 110, 4834; b) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1989, 111, 1351; c) B. H. Lipshutz, E. L. Ellsworth, S. H. Dimock, ibid. 1988, 110, 4834.
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3 has been demonstrated: a) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1988, 110, 4834; b) B. H. Lipshutz, E. L. Ellsworth, T. J. Siahaan, J. Am. Chem. Soc. 1989, 111, 1351; c) B. H. Lipshutz, E. L. Ellsworth, S. H. Dimock, ibid. 1988, 110, 4834.
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