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For reviews on chiral phospholanes and other cyclic phosphines and their application in asymmetric catalysis, see: (a) Holz, J.; Gensow, M.-N.; Zayas, O.; Börner, A. Curr. Org. Chem. 2007, 11, 61.
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33947328891
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Other approaches are based on the cleavage of the P-phenyl bond by lithium or by deprotonation of the P-H bond in relevant phospholanes. The latter methods are frequently accompanied by the epimerization of the adjacent chiral C-atoms or the formation of side products and therefore are not suitable for the construction of optically pure ligands.10c,f
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10c,f
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17
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0001923067
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For other monophospholane derivatives as possible building blocks for coupling reactions, see: a
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For other monophospholane derivatives as possible building blocks for coupling reactions, see: (a) Brunner, H.; Sievi, R. J. Organomet. Chem. 1987, 328, 71.
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26
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33947317289
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Solvents were dried and freshly distilled under argon before use. All reactions were performed under an argon atmosphere by using standard Schlenk techniques. 1H, 13C and 31P NMR spectra were recorded on a Bruker ARX 400 spectrometer at the following frequencies: 400.13 MHz (1H, 100.63 MHz (13C, 161.98 MHz (31P, 235 MHz (19F) with CDCl3 as solvent, R,R)-1- Chloro-2,5-dimethylphospholane (2) A solution of 1-trimethylsilyl-2,5- dimethyl-phospholane (1, 10.0 g, 53.1 mmol) in CH2Cl 2 (60 mL) was added via cannula to a solution of hexachloroethane (12.6 g, 53.1 mmol) in CH2Cl2 (80 mL) under stirring at ambient temperature. Then the mixture was stirred under reflux for 30 min. After cooling, the solvent and tetrachlorethene was removed in vacuo (500 mbar) and the residue was distilled to give chlorophospholane 2 7.40 g, 93, a
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2O (3 mL) was added.
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