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For homogeneous hydrogenations of exo-cyclic enones, see: a) T. Ohta, T. Miyake, N. Seido, H. Kumobayashi, H. Takaya, J. Org. Chem. 1995, 60, 357-363;
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For early studies on the metal-catalyzed asymmetric hydrogenation of the double bonds of enals, see: a P. Avircin-Violet, T.-P. Dang (Rhone-Poulenc Industries), EU 78420001.6, 1978;
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For early studies on the metal-catalyzed asymmetric hydrogenation of the double bonds of enals, see: a) P. Avircin-Violet, T.-P. Dang (Rhone-Poulenc Industries), EU 78420001.6, 1978;
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Alternatively, catalytic asymmetric hydrosilylations of α,β-unsaturated ketones lead to chiral ketones. Those products, however, have the stereogenic centers at the β position. For recent examples, see: a
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Alternatively, catalytic asymmetric hydrosilylations of α,β-unsaturated ketones lead to chiral ketones. Those products, however, have the stereogenic centers at the β position. For recent examples, see: a) B. H. Lipshutz, J. M. Servesko, Angew. Chem. 2003, 115, 4937-4940;
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For a non-asymmetric iridium-catalyzed reduction of an enone by transfer hydrogenation, see
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For recent contributions on iridium-catalyzed hydrogenations of α,β-unsaturated acids and esters, see: a
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For a rhodium-catalyzed asymmetric hyrdogenative aldol coupling of vinl ketones, see
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37
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84890977660
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for recent overviews on the use of sulfoximines in asymmetric synthesis and metal catalysis, see: c, Eds, D. Enders, K.-E. Jaeger, Wiley-VCH, Weinheim
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Related P,N ligands have also proven applicable in the asymmetric reductions of (largely) unfunctionalized olefins; for key reviews, see: a) X. Cui, K. Burgess, Chem. Rev. 2005, 105, 3272-3296;
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Related P,N ligands have also proven applicable in the asymmetric reductions of (largely) unfunctionalized olefins; for key reviews, see: a) X. Cui, K. Burgess, Chem. Rev. 2005, 105, 3272-3296;
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44
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57349109326
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Hydrogenations of tetrasubstituted olefins under these conditions have not yet been studied. Results along this line will be reported in due course
-
Hydrogenations of tetrasubstituted olefins under these conditions have not yet been studied. Results along this line will be reported in due course.
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