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79955664650
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note
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1,10a = 5.2 Hz for 2′ (cf. Refs. 7b and 8b).
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33
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79955662311
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note
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2O (3 ml) and the precipitate filtered and dried.
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79955649393
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int = 0.0348] were used for further refinement. The absorption correction was performed empirically using APEX2 (Bruker, 2005). Analysis of Fourier density synthesis revealed that the SPh substituent is disordered by two positions with equal occupancies. The refinement converged to wR2 = 0.0531 and GOF = 1.000 for all independent reflections (R1 = 0.0749 was calculated against F for 3104 observed reflections with I >2σ(I)). The refinement of absolute structure led to a Flack parameter (Flack, H.D. Acta Crystallogr., Sect. A 1983, 39, 876-881) equal to 0.00(17). All calculations were performed using SHELXTL PLUS 5.0 (Sheldrick, G.M. Acta Crystallogr., Sect. A 2008, 64, 112-122). CCDC 799240 contains the supplementary crystallographic data for 3b. These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html (or from the CCDC, 12 Union Road, Cambridge, CB2 1EZ, UK; fax: (+44) 1223 336033; or deposit@ccdc.cam.ac.uk.
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79955674315
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note
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3 (1 ml) was added dropwise at 0 °C with stirring. The resulting mixture was kept at 0 °C for 40 min and then evaporated to dryness. The residue was chromatographed on silica gel (eluent: hexane/EtOAc, 5:1) to afford nitriles 4a-c.
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38
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3342895856
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- evidently attacks the more sterically hindered position of the intermediate cation)
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- evidently attacks the more sterically hindered position of the intermediate cation): Valeev, F. A.; Gorobets, E. V.; Tsypysheva, I. P.; Singizova, G. Sh.; Kalimullina, L. Kh.; Safarov, M. G.; Shitikova, O. V.; Miftakhov, M. S. Chem. Nat. Compd. 2003, 39, 563.
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Valeev, F.A.1
Gorobets, E.V.2
Tsypysheva, I.P.3
Sh., S.G.4
Kh., K.L.5
Safarov, M.G.6
Shitikova, O.V.7
Miftakhov, M.S.8
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