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a) Waldron, N.M.; Montevalli, M.; Azam, S.; Dasopolous, P.C. J. Chem. Soc., Chem. Commun. 1995, 81-82.
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0342727967
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note
-
The X ray data of 4a and 5a are registered at the Cambridge Cristallographic Data Centre, Cambridge (U.K.).
-
-
-
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33
-
-
0343597956
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-
note
-
The N(1)C(2)C(3)C(3a)C(7a) ring is almost planar, the C(7a) atom being at a distance of 0.027 Å from the N(1)C(2)C(3)C(3a) mean plane. The dihedral angle between the C(3a)C(4)C(5)C(6)C(7)C(7a) and N(1)C(2)C(3)C(3a)C(7a) planes is 1.10°. The piperidinium ring adopts a perfect chair conformation; the dihedral angle between his mean plane and the N(1)C(2)C(3)C(3a)C(7a) mean plane is 88.84°.
-
-
-
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34
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0343162576
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Bond lenghts in crystalline organic compounds
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72nd Edition CRC Press
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Handbook of Chemistry and Physics; Lide, D.R., Editor-in-Chief; 72nd Edition 1991-1992, CRC Press. Bond lenghts in crystalline organic compounds 9-3 to 9-17.
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0342727963
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44
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0342292919
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note
-
When a toluenic solution of the ylide 5a was refluxed for 24 h, no transformation into the mesoionic compound 4a was observed.
-
-
-
-
45
-
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0342727932
-
-
note
-
For instance as described in ref. 6a, refluxing the mesoionic compound XI (see structure in Table 2) in toluene yielded a bridgehead lactam through a [1,3] shift.
-
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46
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0001241137
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J.; Coll.
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Regitz, M.; J. Hocker, J.; Liedhegener, A. Org. Synth. 1973, Coll. Vol. 5, 179.
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47
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0000356528
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For explosive hazard of diazotransfer reagents, see: Bollinger, F.W.; Tuma, L.D. Synlett, 1996, 407-413.
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Tuma, L.D.2
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