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Quite recently Oshima and co-workers reported an elegant radical reaction involving chlorodiphenylphosphine, diphenylphosphine, triethylamine, and a terminal alkyne leading to a 1,2-bis(diphenylphosphino)alkene, which could be readily oxidized with hydrogen peroxide to furnish a 1,2-bis(diphenylphosphinyl)alkene. See:
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Quite recently Oshima and co-workers reported an elegant radical reaction involving chlorodiphenylphosphine, diphenylphosphine, triethylamine, and a terminal alkyne leading to a 1,2-bis(diphenylphosphino)alkene, which could be readily oxidized with hydrogen peroxide to furnish a 1,2-bis(diphenylphosphinyl)alkene. See:. Sato A., Yorimitsu H., and Oshima K. Angew. Chem., Int. Ed. 44 (2005) 1694
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Sato, A.1
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54
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0000852316
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It has been known that palladium acetate is reduced to generate Pd(0) species when treated with a phosphine; see:
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It has been known that palladium acetate is reduced to generate Pd(0) species when treated with a phosphine; see:. Amatore C., Jutand A., and M'Barki M.A. Organometallics 11 (1992) 3009
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Amatore, C.1
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56
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34249912448
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Double addition has been documented. See: (a) Ref. 6h.
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58
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34249915613
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note
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In view of possible oligomerization of 1a, we used a slight excess of 1a. For clearer understanding of the reaction profile forming both single and double phosphinylated products (3a, 4a, 5a, and 6a), however, the product yields in this particular reaction were tentatively calculated based on the quantity of 1a charged.
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34249867235
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note
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The higher branch-selectivity in this experiment (100 °C), as compared with the branch-selectivity (<5%) observed at 70 °C suggests that the higher reaction temperature is also a factor that enhances the branch-selectivity. See Ref. 7b.
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note
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Conversions of diphenylphosphine oxide in the reactions run in n-octane and ethanol were only 40% and 18%, respectively.
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note
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3 and column chromatography using hexane/ethyl acetate (1/1) afforded 3a in 83% yield.
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note
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Despite the low yield of 4k, 5k, and 6k were not formed at all. We thank reviewers who recommended us to examine the reaction of trimethylsilylacetylene, which displayed the exceptional behavior.
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63
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0003666432
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Secondary phosphine oxides exist in two tautomeric isomers, P(O)H and P(OH), the former being dominant in the equilibrium. See:
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Secondary phosphine oxides exist in two tautomeric isomers, P(O)H and P(OH), the former being dominant in the equilibrium. See:. Bailey W.J., and Fox R.B. J. Org. Chem. 28 (1963) 531
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Kosolapoff G.M., and Maier L. (Eds), Wiley, New York Chapter 11
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Hamilton L.A., and Landis P.S. In: Kosolapoff G.M., and Maier L. (Eds). Organic Phosphorus Compounds Vol. 4 (1972), Wiley, New York Chapter 11
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Organic Phosphorus Compounds
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Hamilton, L.A.1
Landis, P.S.2
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66
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34249909847
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note
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Obtained from a mixture resulting from an uncatalyzed reaction of (p-tolylethynyl)diphenylphosphine oxide (8) with 2 run at 100 °C for 3 h in toluene (vide infra).
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67
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34249864853
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note
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In the present reaction of p-tolylacetylene, we do have detected a trace of (p-tolylethynyl)diphenylphosphine oxide.
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68
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0001558554
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Prepared by hydrogen peroxide oxidation of (p-tolylethynyl)diphenylphosphine. See:
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Prepared by hydrogen peroxide oxidation of (p-tolylethynyl)diphenylphosphine. See:. Liu B., Wang K.K., and Petersen J.L. J. Org. Chem. 61 (1996) 8503
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37049142611
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For selected examples of apparent trans-insertion involving late transition metal complexes, see:
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For selected examples of apparent trans-insertion involving late transition metal complexes, see:. Green M., and Taylor S.H. J. Chem. Soc., Dalton Trans. (1975) 1142
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J. Chem. Soc., Dalton Trans.
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For mechanistic aspects of apparent trans-insertion, see:. Nakamura A., and Otsuka S. J. Mol. Catal. 1 (1975/76) 285
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