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-
39
-
-
33845275715
-
-
note
-
To obtain the DFT racemization barrier, a single point calculation was carried out using the major basis set 6-311+ + G(d,p) at the 6-31G(d,p) geometry. The thermal contribution to free energy was estimated at the AM1 level.
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-
-
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40
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33845261479
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-
note
-
[27]
-
-
-
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41
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33845236315
-
-
note
-
Previous analysis of racemic 1 by chiral HPLC showed two resolved peaks of equal areas and identical UV spectra, corresponding to both enantiomers of pentahelicene 1.
-
-
-
-
42
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0030743672
-
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It has been previously shown that that the ligation of Pd(dba) by BINAP is a slow reaction: C. Amatore, G. Broeker, A. Jutland, F. Khalil, J. Am. Chem. Soc. 1997, 119, 5176-5185.
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Amatore, C.1
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44
-
-
33845238187
-
-
note
-
3 with (R)-BINAP in CH3́CN/THF (1.5:1) for 7 h at room temperature, affords quantitative formation of 9 (NMR, TLC).
-
-
-
-
45
-
-
33845273742
-
-
note
-
3 with (R)-BINAP for 1 h, led to identical results that those obtained when the catalyst 9 was isolated before use.
-
-
-
-
46
-
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0034679009
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L. M. Alcazar-Roman, J. F. Hartwig, A. L. Rheingold, L. M. Liabe-Sands, I. A. Guzei, J. Am. Chem. Soc. 2000, 122, 4618-4630.
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49
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0032496939
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b) The oxidation of chiral bisphosphine ligands has been associated with loss of stereoinduction : A. Ashimori, B. Bachand, M. A. Calter, S. P. Govek, L. E. Overman, D. L. Poon, J. Am. Chem. Soc. 1998, 120, 6489-6499.
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50
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0000314775
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For related monophosphine analogues, see : a) E. O. Greaves, C. J. L. Lock, P. M. Maitlis, Can. J. Chem. 1968, 46, 3879-3891;
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33845269917
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c) A. Dervisi, P. G. Edwards, P. D. Newman, R. P. Tooze, Dalton. 2000, 523-528.
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53
-
-
33845238613
-
-
note
-
A very slow addition rate of the TBAF solution is required. Otherwise, the fast generation of the aryne leds to low yields of the [2 + 2 + 2] cycloaddition products.
-
-
-
-
54
-
-
33845255697
-
-
note
-
1 × t.
-
-
-
-
55
-
-
33845265802
-
-
note
-
2/(S)-(-)-BPO- catalyzed cycloisomerization of an aromatic triyne.
-
-
-
-
56
-
-
0028039221
-
-
Previous reports on catalytic enantioselective [2 + 2+2] cycloadditions: a) Y. Sato, T. Nishimata, M. Mon J. Org. Chem. 1994, 59, 6133-6135;
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Sato, Y.1
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Mon, M.3
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58
-
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0026724082
-
-
Column OL-86 was prepared in the laboratories of Prof. Dr. Cristina Minguillón (Universitat de Barcelona) using the chiral selector of column CSP-1c. See: L. Oliveros, C. Minguillón, B. Desmazieres, P.-L. Besbene, J. Chromatogr. A 1992, 606, 9-17.
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Oliveros, L.1
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60
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0242560405
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A. Altomare, M. C. Burla, M. Camalli, G. L. Cascarano, C. Giacovazzo, A. Guagliardi, A. G. G. Moliterni, G. Polidori, R. Spagna, J. Appl. Crystallogr. 1999, 32, 115-119.
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Moliterni, A.G.G.7
Polidori, G.8
Spagna, R.9
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