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37
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0343214276
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note
-
3. A total of 1925 reflections were measured at T = 298 K. The standards were measured after every 25 reflections. Among the first 20 pairs of reflections, the signs of the corresponding calculated differences established that the molecule is described with the correct S absolute configuration. Moreover, the sum of the bond angles around the nitrogen atom of the pyrrolidine ring is 338.1, showing a nonplanar configuration. Crystallographic data (excluding structure factors) for the structure reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. CCDC-140554. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB21EZ, UK (fax: (+44)1223-336-033; e-mail: deposit@ccdc.cam. ac.uk).
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-
-
-
38
-
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0004234211
-
-
4 used was free of HCl in order to obtain reproducible results. See: A. D. Cross, Q. Rev. Chem. Soc. 1960, 14, 317.
-
(1960)
Q. Rev. Chem. Soc.
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-
-
Cross, A.D.1
-
40
-
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0032539228
-
-
Cationic silicon species have been already postulated as intermediates in other Lewis base promoted reactions; see: a) S. E. Denmark, X. Su, Y. Nishigaichi, J. Am. Chem. Soc. 1998, 120, 12990; b) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 137; c) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 75.
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J. Am. Chem. Soc.
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-
-
Denmark, S.E.1
Su, X.2
Nishigaichi, Y.3
-
41
-
-
0003067336
-
-
Cationic silicon species have been already postulated as intermediates in other Lewis base promoted reactions; see: a) S. E. Denmark, X. Su, Y. Nishigaichi, J. Am. Chem. Soc. 1998, 120, 12990; b) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 137; c) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 75.
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J. Organomet. Chem.
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Bassindale, A.R.1
Lau, J.C.Y.2
Taylor, P.G.3
-
42
-
-
0010817631
-
-
Cationic silicon species have been already postulated as intermediates in other Lewis base promoted reactions; see: a) S. E. Denmark, X. Su, Y. Nishigaichi, J. Am. Chem. Soc. 1998, 120, 12990; b) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 137; c) A. R. Bassindale, J. C. Y. Lau, P. G. Taylor, J. Organomet. Chem. 1995, 499, 75.
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Bassindale, A.R.1
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Taylor, P.G.3
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44
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0041125475
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b) L. Tottie, C. Moberg, A. Heumann, Acta Chem. Scand. 1993, 47, 492.
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Tottie, L.1
Moberg, C.2
Heumann, A.3
-
45
-
-
0342344682
-
-
note
-
3). Moreover, the chlorohydrin generated in entry 11 is not very stable and a decomposition of the product has been noticed after few hours.
-
-
-
-
46
-
-
0342344681
-
-
note
-
4 catalyzed by the chiral ortho-methoxyphenyldiazaphosphonamide Lewis bases. Whatever the experimental conditions, low enantiomeric excess values of chlorohydrins (<10% ee) and poor regioselectivity have been encountered, except when opening racemic phenyloxirane, where a total regioselectivity has been observed but with only 12% ee. The residual epoxide was isolated in 35% yield and 20% ee.
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