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85033147466
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Unpublished results
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Studies from these laboratories with chiral nonracemic bisoxazolines as ligands for palladium in the cyclopropanation of olefins with diazomethane yielded only racemic cyclopropanes. Edwards, J. P.; Faucher, A. M.; Stavenger, R. Unpublished results.
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Edwards, J.P.1
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34
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85033126896
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note
-
While it is conceivable that bis(iodomethyl)zinc could also form alkoxides, the results were less than encouraging. The reaction of cinnamyl alcohol with 2 equiv of preformed bis(iodomethyl)zinc proceeded very slowly and, in the presence of 0.1 equiv of 7, was also less selective. Either deprotonation is not taking place or the (iodomethyl)zinc alkoxide that is formed is much less reactive than the corresponding ethylzinc alkoxide.
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-
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35
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0001030014
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21b (a) Bordwell, F. G.; Branca, J. C.; Highes, D. L.; Olmstead, W. N. J. Org. Chem. 1980, 45, 3305. (b) Murto, J. Acta Chem. Scand. 1964, 18, 1043.
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Bordwell, F.G.1
Branca, J.C.2
Highes, D.L.3
Olmstead, W.N.4
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36
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0001030014
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21b (a) Bordwell, F. G.; Branca, J. C.; Highes, D. L.; Olmstead, W. N. J. Org. Chem. 1980, 45, 3305. (b) Murto, J. Acta Chem. Scand. 1964, 18, 1043.
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Acta Chem. Scand.
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Murto, J.1
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37
-
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0000903698
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(a) ( - )-17 has been assigned as (1R,2R), Keiderling, T. A.; Yasui, S. C. J. Am. Chem. Soc. 1987, 109, 2311. Sugita, T.; Inouye, Y. Bull. Chem. Soc. Jpn. 1966, 39, 1075.
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Keiderling, T.A.1
Yasui, S.C.2
-
38
-
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1542532298
-
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(a) ( - )-17 has been assigned as (1R,2R), Keiderling, T. A.; Yasui, S. C. J. Am. Chem. Soc. 1987, 109, 2311. Sugita, T.; Inouye, Y. Bull. Chem. Soc. Jpn. 1966, 39, 1075.
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-
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Sugita, T.1
Inouye, Y.2
-
39
-
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0012829422
-
-
(b) (+)-18 has been assigned as (1S,2R), Scholl, B.; Hansen, H.-J. Helv. Chim. Acta 1986, 69, 1936.
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(1986)
Helv. Chim. Acta
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-
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Scholl, B.1
Hansen, H.-J.2
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40
-
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85033146700
-
-
( - )-19 has been assigned as (1R,2R), ref 18a
-
(c) ( - )-19 has been assigned as (1R,2R), ref 18a.
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-
-
-
41
-
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85033145948
-
-
note
-
Careful monitoring of the reactions with and without added zinc iodide have shown a time dependence of enantioselectivity along with the elimination of the induction period.
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-
-
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42
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85033141396
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-
note
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All transfers of neat diethylzinc were performed using microliter syringes.
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-
-
-
43
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0000151113
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Wilkinson, G., Ed.; Pergamon Press: New York, Chapter 16
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Boersma, J. In Comprehensive Organometallic Chemistry; Wilkinson, G., Ed.; Pergamon Press: New York, 1982; Vol. 2, Chapter 16.
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Boersma, J.1
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44
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0001380634
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Takai, K.; Kakiuchi, T.; Utimoto, K. J. Org. Chem. 1994, 59, 2671.
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Takai, K.1
Kakiuchi, T.2
Utimoto, K.3
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46
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85033137673
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-
note
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(b) We wish to thank Professor Seebach for kindly providing us with the details of their diethylzinc distillation.
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-
-
-
50
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37049115338
-
-
3 is tetrameric in the solid state. X-ray structures : (a) Shearer, H. M. M.; Spencer, C. B. Chem. Commun. 1966, 194. (b) Shearer, H. M. M.; Spencer, C. B. Acta Crystallogr., Sect. B: Crystallogr. Cryst. Chem. 1980, 36, 2046.
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Shearer, H.M.M.1
Spencer, C.B.2
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51
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0000223489
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3 is tetrameric in the solid state. X-ray structures : (a) Shearer, H. M. M.; Spencer, C. B. Chem. Commun. 1966, 194. (b) Shearer, H. M. M.; Spencer, C. B. Acta Crystallogr., Sect. B: Crystallogr. Cryst. Chem. 1980, 36, 2046.
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, pp. 2046
-
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Shearer, H.M.M.1
Spencer, C.B.2
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52
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85033131058
-
-
note
-
We have attempted to grow crystals of a variety of bissulfonamides such as 31 with various combinations of solvent, temperature, concentration, and by the addition of both mono- and bidentate ligands for zinc (i.e., TMEDA). Invariably, no crystals were formed, and the solutions became viscous and gellike or a fine powder was formed. This suggests to us that the sulfonamide-zinc species such as 48 are self-associating to form polymeric networks. The zinc of one sulfonamide-zinc complex can be envisioned to coordinate the sulfonyl oxygen of another followed by additional such interactions to form a large networklike structure.
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