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the term atropisomers is generally used for conformers that have a half-life that is arbitrarily defined as longer than 1000 s, see: b) M. Oki, Top. Stereochem. 1983, 14, 1-81.
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24
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33746311312
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note
-
1H NMR spectra (400 MHz) was reported in ref. [8c] without apparently recognizing that 7a is a chiral compound; this splitting is not due to the presence of rotamers.
-
-
-
-
25
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0002773030
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A substituent in the 8-position of the binaphthyl moiety does not always correspond to a higher rotational barrier; for example, see: A. S. Cooke, M. M. Harris, J. Chem. Soc. 1963, 2365-2373;
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Cooke, A.S.1
Harris, M.M.2
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27
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0002016628
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K. Fuji, M. Sakurai, N. Tohkai, A. Kuroda, T. Kawabata, Y. Fukazawa, T. Kinoshita, T. Tada, Chem. Commun. 1996, 1609-1610.
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Fukazawa, Y.6
Kinoshita, T.7
Tada, T.8
-
28
-
-
33746284597
-
-
note
-
2PHAL (10); PYR = 2,5-diphenyl-4,6-pyrimidinediyl diether, PHAL = 1,4-phthalazinediyl diether.
-
-
-
-
30
-
-
33746284888
-
-
note
-
1 values afforded lower conversions (15-50% after 4 days) and enantioselectivies (48-69% ee).
-
-
-
-
31
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33746296250
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CCDC-288198 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
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-
-
-
33
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33645952823
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Very recently, a cinchona-alkaloid-mediated organocatalytic Friedel-Crafts-type reaction was reported: B. Török, M. Abid, G. London, J. Esquibel, M. Török, S. C. Mhadgut, P. Yan, G. K. Surya Prakash, Angew. Chem. 2005, 117, 3146-3149;
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Török, B.1
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London, G.3
Esquibel, J.4
Török, M.5
Mhadgut, S.C.6
Yan, P.7
Surya Prakash, G.K.8
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34
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18844380223
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Angew. Chem. Int. Ed. 2005, 44, 3086-3089.
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