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Recent preparation of optically active SPOs: (a) Pietrusiewicz, K. M.; Zablocka, M. Chem. Rev. 1994, 94, 1375.
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(a) A general review: Organic Phosphorus Compounds; Kosolapoff, G. M., Maier, L., Eds.; Wiley-Interscience: New York, 1972; Vol. 3,Chapter 6.
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Optically pure H-phosphinates 1a-d can be purchased from Katayama Chemical Industries Co.Ltd. (http://www.katayamakagaku.co.jp). Preparation of optically active H-phosphinates: (a) Farnham, W. B.; Murray, R. K.; Mislow, K. J. Am. Chem. Soc. 1970, 92, 5809.
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Optically pure H-phosphinates 1a-d can be purchased from Katayama Chemical Industries Co.Ltd. (http://www.katayamakagaku.co.jp). Preparation of optically active H-phosphinates: (a) Farnham, W. B.; Murray, R. K.; Mislow, K. J. Am. Chem. Soc. 1970, 92, 5809.
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(e) Reference 6.
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35
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0003697242
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Early attempts to prepare chiral SPOs via similar substitution reactions only led to the nonselective formation of racemates, see: (a) Emmick, T. L, Letsinger, R. L. J. Am. Chem. Soc. 1968, 90, 3459
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Early attempts to prepare chiral SPOs via similar substitution reactions only led to the nonselective formation of racemates, see: (a) Emmick, T. L.; Letsinger, R. L. J. Am. Chem. Soc. 1968, 90, 3459.
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52449114432
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Other early attempts to obtain chiral SPOs by reduction of the corresponding optically active P-stereogenic precursors using aluminium reagents also failed, see: (a) Reference 9a
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Other early attempts to obtain chiral SPOs by reduction of the corresponding optically active P-stereogenic precursors using aluminium reagents also failed, see: (a) Reference 9a.
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It was also reported that phosphine oxides undergo rapid stereomutation in the presence of aluminium reagents prior to reduction, see: (d) Henson, P. D.; Nauman, K.; Mislow, K. J. Am. Chem. Soc. 1969, 91, 5645.
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We found that although stable under basic conditions, 2a instantly epimerizes when treated with diluted hydrogen chloride acid. Even a trace amount of acid can cause this epimerization even at-80°C. Thus, all glasswares used for keeping this compound were all carefully deacidified by washing them first with an alkaline solution and then with water
-
We found that although stable under basic conditions, 2a instantly epimerizes when treated with diluted hydrogen chloride acid. Even a trace amount of acid can cause this epimerization even at-80°C. Thus, all glasswares used for keeping this compound were all carefully deacidified by washing them first with an alkaline solution and then with water.
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49
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52449110906
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P)-1a used was recovered without epimerization.
-
P)-1a used was recovered without epimerization.
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See Supporting Information for a table with chemical structures of the products
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See Supporting Information for a table with chemical structures of the products.
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P)- 1a by t-BuONa and EtOMgCl were also noted (ref 6b).
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P)- 1a by t-BuONa and EtOMgCl were also noted (ref 6b).
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P)-5a with n-BuLi at low temperature indicated that this substitution took place with inversion of configuration at phosphorus via a similar mechanism for phosphites: Neuffer, J.; Richter, W. J. J. Organomet. Chem. 1986, 301, 289.
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P)-5a with n-BuLi at low temperature indicated that this substitution took place with inversion of configuration at phosphorus via a similar mechanism for phosphites: Neuffer, J.; Richter, W. J. J. Organomet. Chem. 1986, 301, 289.
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