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Enantioselective ene-yne cycloisomerization processes have been reviewed, see
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Enantioselective ene-yne cycloisomerization processes have been reviewed, see: I. J. S. Fairlamb, Angew. Chem. 2004, 116, 1066-1070;
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For a recent enantioselective alkyne activation, see
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For a recent enantioselective alkyne activation, see: M. Paz Muñoz, J. Adrio, J. C. Carretero, A. M. Echavarren, Organometallics 2005, 24, 1293-1300.
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For selected examples of gold-catalyzed heteronucleophile addition to allenes, see: a
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Itoh reported that internal alkene substituents completely inactivate Rh-catalyzed eneallene cycloisomerizations, see footnote [8
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Itoh reported that internal alkene substituents completely inactivate Rh-catalyzed eneallene cycloisomerizations, see footnote [8].
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50
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33646353039
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Six-membered-ring products have been observed from Pauson-Khand-type reactions and thermal [2+2] cyclizations of eneallenes. See, for example: a) F. Inagaki, C. Mukai, Org. Lett. 2006, 8, 1217-1220;
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I cations, see: N. Mézailles, L. Ricard, F. Gagosz, Org. Lett. 2005, 7, 4133-4136.
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55
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2MeO-BIPHEP digold catalyst reported by Widenhoefer and co-workers for the cyclization of allenyl alcohols gave full conversion but low ee in the present system (see footnote [6e]).
-
2MeO-BIPHEP digold catalyst reported by Widenhoefer and co-workers for the cyclization of allenyl alcohols gave full conversion but low ee in the present system (see footnote [6e]).
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I-catalyzed asymmetric alkoxy cyclization of ene-ynes, see reference [3].
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I-catalyzed asymmetric alkoxy cyclization of ene-ynes, see reference [3].
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60
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34548656070
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For structural information, contact Dr. Peter White in the UNC-Chapel Hill X-ray Facility (pswhite@email.unc.edu).
-
For structural information, contact Dr. Peter White in the UNC-Chapel Hill X-ray Facility (pswhite@email.unc.edu).
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Crystal data for [3,5-xylyl-binap(AuCl)2] at 100 K: C 52H48Au2Cl2P2, 1/2 H 2O, Mr, 1200.76 g mol-1, orthorhombic, space group P212121, a, 12.6526(5, b, 19.0582(7, c, 38.1147(13) Å, V, 9190.8(6) Å3, Z, 8, ρcalcd, 1.746 mg m-3, R1, 0.0423 (0.0527, wR2, 0.0933 (0.0996, for 4688 reflections with I > 2σ(I, for 26 863 reflections (Rint, 0.0604) with a total of 219 861 measured reflections, goodness-of-fit on F2, 1.029, largest diff peak hole, 4.909, 4.305 e Å-3
-
-3).
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62
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I-L bond angle is typically in the 170-180° range. See, for example: a A. A. Mohamed, J. Chen, A. E. Bruce, M. R. M. Bruce, J. A. K. Bauer, D. T. Hill, Inorg. Chem. 2003, 42, 2203-2205;
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I-L bond angle is typically in the 170-180° range. See, for example: a) A. A. Mohamed, J. Chen, A. E. Bruce, M. R. M. Bruce, J. A. K. Bauer, D. T. Hill, Inorg. Chem. 2003, 42, 2203-2205;
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Balch, A.L.6
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