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Radical or base-catalyzed addition of RaP(O)H to alkynes are known. For example, see: (a) Solovetskaya, L. A.; Sergeev, N. M.; Magdeeva, R. K.; Nifant'ev, E. E. Zh. Obshch. Khim. 1985, 55, 1201. (b) Nifant'ev, E. E.; Solovetskaya, L. A.; Magdeeva, R. K. Zh. Obshch. Khim. 1985, 55, 2263. (c) Antoshin, A. E.; Khartonov, A. V.; Tsvetkov, E. N. Zh. Obshch. Khim. 1992, 62, 1264.
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(1985)
Zh. Obshch. Khim.
, vol.55
, pp. 2263
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Nifant'ev, E.E.1
Solovetskaya, L.A.2
Magdeeva, R.K.3
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47
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4243108356
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Radical or base-catalyzed addition of RaP(O)H to alkynes are known. For example, see: (a) Solovetskaya, L. A.; Sergeev, N. M.; Magdeeva, R. K.; Nifant'ev, E. E. Zh. Obshch. Khim. 1985, 55, 1201. (b) Nifant'ev, E. E.; Solovetskaya, L. A.; Magdeeva, R. K. Zh. Obshch. Khim. 1985, 55, 2263. (c) Antoshin, A. E.; Khartonov, A. V.; Tsvetkov, E. N. Zh. Obshch. Khim. 1992, 62, 1264.
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(1992)
Zh. Obshch. Khim.
, vol.62
, pp. 1264
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-
Antoshin, A.E.1
Khartonov, A.V.2
Tsvetkov, E.N.3
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48
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4243117430
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note
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31P NMR, suggesting the reversibility of the reaction of eq 1.
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-
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49
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4243188095
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note
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P-P(O) = 305.9 Hz).
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50
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0000290184
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and referencies cited therein
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Carty, A. J.; Jacobson, S. E.; Simpson, R. T.; Taylor, N. J. J. Am. Chem. Soc. 1975, 97, 7254 and referencies cited therein.
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(1975)
J. Am. Chem. Soc.
, vol.97
, pp. 7254
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Carty, A.J.1
Jacobson, S.E.2
Simpson, R.T.3
Taylor, N.J.4
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52
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0039841696
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Appleton, T. G.; Clark, H. C.; Manzer, L. E. Coord. Chem. Rev. 1973, 10, 335.
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(1973)
Coord. Chem. Rev.
, vol.10
, pp. 335
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Appleton, T.G.1
Clark, H.C.2
Manzer, L.E.3
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53
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4243119592
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note
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6, on standing at room temperature, remained unchanged. Diphenylphosphine oxide was extruded as the decomposition progressed.
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54
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4243110529
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note
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6 was heated at 70 °C for 5 h.
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-
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55
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4243115125
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note
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4 as catalyst, neither the use of an excess of Ph2P(O)H (2 equiv) nor the use of other solvents such as THF and MeCN suppressed the formation of the byproducts.
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-
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56
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4243190268
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note
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3 as eluent to yield a mixture of adducts 2 as a white solid (63 mg, 0.201 mmol, 2a/2b = 96/4). These two regioisomers (2a,b) were separated by preparative TLC (silica gel, hexane/EtOAc = 2/3).
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57
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4243090435
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note
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1H NMR confirmed that the regioaelectivity was nearly constant throughout the reaction. Accordingly, the unusual selectivity is not due to an isomerization of an initially formed isomer.
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