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33847803880
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Typically, oxidative addition of aryl chlorides to Pd(0) requires temperatures of 60-140°C. (a) Grushin, V. V.; Alper, H. Chem. Rev. 1994, 94, 1047-1062. (b) Hermann, W. A.; Brossmer, C.; Priermeier, T.; Öfele, K. J. Organomet. Chem. 1994, 481, 97-108. (c) Parshall, G. W. J. Am. Chem. Soc. 1974, 96, 2360-2366. (d) Huser, M.; Youinou, M.-T.; Osborn, J. A. Angew. Chem., Int. Ed. 1989, 28, 1386-1388.
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Parshall, G.W.1
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36
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Typically, oxidative addition of aryl chlorides to Pd(0) requires temperatures of 60-140°C. (a) Grushin, V. V.; Alper, H. Chem. Rev. 1994, 94, 1047-1062. (b) Hermann, W. A.; Brossmer, C.; Priermeier, T.; Öfele, K. J. Organomet. Chem. 1994, 481, 97-108. (c) Parshall, G. W. J. Am. Chem. Soc. 1974, 96, 2360-2366. (d) Huser, M.; Youinou, M.-T.; Osborn, J. A. Angew. Chem., Int. Ed. 1989, 28, 1386-1388.
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Osborn, J.A.3
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37
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0003464638
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Prentice Hall: Upper Saddle River, New Jersey
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(a) It is well-known that the use of electron-rich phosphine ligands accelerates the rate of oxidative addition of aryl halides to Pd(0). See: Spessard, G. O.; Meissler, G. L. Organometallic Chemistry; Prentice Hall: Upper Saddle River, New Jersey, 1996; pp 171-175.
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Organometallic Chemistry
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Spessard, G.O.1
Meissler, G.L.2
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38
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33751386097
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2 (dippp = 1,3-bis(diisopropylphosphino)propane) at 38°C. Portnoy, M.; Milstein, D. Organometallics 1993, 12, 1665-1673.
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Portnoy, M.1
Milstein, D.2
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0030760929
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(b) Widenhoefer, R. A.; Zhong, H. A.; Buchwald, S. L. J. Am. Chem. Soc. 1997, 119, 6787-6795.
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Widenhoefer, R.A.1
Zhong, H.A.2
Buchwald, S.L.3
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42
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0030758961
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(d) Hillhouse has reported C-O bond forming reductive elimination from nickel complexes. Han, R.; Hillhouse, G. L. J. Am. Chem. Soc. 1997, 119, 8135-8136.
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Han, R.1
Hillhouse, G.L.2
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0030007033
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(b) Hartwig, J. F.; Richards, S.; Baranano, D.; Paul, F. J. Am. Chem. Soc. 1996, 118, 3626-3633.
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Hartwig, J.F.1
Richards, S.2
Baranano, D.3
Paul, F.4
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45
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0345412188
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-
note
-
We have previously speculated that improved results in Pd-catalyzed aryl C-O bond forming reactions might be obtained with the use of bulky, electron-deficient, chelating phosphine ligands; see ref 6b.
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-
-
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46
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0344549945
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note
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Di-tert-butylchlorophosphine is the bulkiest dialkylchlorophosphine which is commercially available.
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-
-
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47
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0344980904
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Schlosser, M., Ed.; John Wiley and Sons: Chichester
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Schlosser, M. in Organometallics in Synthesis; Schlosser, M., Ed.; John Wiley and Sons: Chichester, 1994; pp 129-133.
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Schlosser, M.1
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48
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33845376366
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Premixing of sodium hydride and the phenol is required to avoid palladium-catalyzed hyride reduction of the aryl halide; Pd-catalyzed reduction of vinyl triflates by LiH and KH has been previously observed: Scott, W. J.; Stille, J. K. J. Am. Ckem. Soc., 1986, 108, 3033-3040.
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(1986)
J. Am. Ckem. Soc.
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Scott, W.J.1
Stille, J.K.2
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49
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0345412163
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note
-
8e we employed dicylclohexylphenylphosphine in a control reaction due the commercial availability of this compound.
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-
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50
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0344549942
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note
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Control experiments were carried out in the absence of a palladium salt. For the reaction of 4-bromoacetophenone and phenol with potassium phosphate in toluene at 100°C, none of the desired product was detected; in DMF at 100°C, 32% (GC, corrected) of the starting halide was consumed, and a 5% GC yield of the desired product was observed.
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-
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51
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0345412162
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note
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An exception is the reaction of 2-bromobenzotrifluoride and o-cresol to provide the corresponding diaryl ether in 75% isolated yield; the reaction of 2-bromoacetophenone and o-cresol proceeded to 25% conversion (GC) with ligand 4, affording <20% of the desired product.
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-
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52
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0344549935
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note
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Yields are typically 15-20% higher, and improved product/arene ratio is observed.
-
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-
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53
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0344118292
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note
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nPd(Ar)X complexes has been shown to occur at room temperature when L = BINAP or DPPF.; see ref 6d, 11b-c.
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54
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33845469974
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Bäckvall, J. E; Björkman, E. E.; Petterson, L.; Siegbahn, P. J. Am. Chem. Soc. 1984, 106, 4369-4373.
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Bäckvall, J.E.1
Björkman, E.E.2
Petterson, L.3
Siegbahn, P.4
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55
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0344549941
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note
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We cannot rule out a situation where not all of the palladium is ligated in the reaction mixture and the reactions are proceeding through bis(phosphine) intermediates.
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57
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0000499068
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(b) Paul, F.; Patt, J.; Hartwig, J. F. J. Am. Chem. Soc. 1994, 116, 5969-5970.
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Paul, F.1
Patt, J.2
Hartwig, J.F.3
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5844307923
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(e) Louie, J.; Paul, F.; Hartwig, J. F. Organometallics 1996, 15, 2794-2805.
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Louie, J.1
Paul, F.2
Hartwig, J.F.3
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61
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0037955086
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Hartwig has proposed a similar mechanism to account for electronic effects in C-S and C-N bond forming reductive elimination reactions. (a) Baranano, D.; Hartwig, J. F. J. Am. Chem. Soc. 1995, 117, 2937-2938. (b) Driver, M. S.; Hartwig, J. F. J. Am. Chem. Soc. 1997, 119, 8232- 8245.
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Baranano, D.1
Hartwig, J.F.2
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62
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0030864744
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Hartwig has proposed a similar mechanism to account for electronic effects in C-S and C-N bond forming reductive elimination reactions. (a) Baranano, D.; Hartwig, J. F. J. Am. Chem. Soc. 1995, 117, 2937-2938. (b) Driver, M. S.; Hartwig, J. F. J. Am. Chem. Soc. 1997, 119, 8232-8245.
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Driver, M.S.1
Hartwig, J.F.2
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64
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Sadighi, J. P.; Harris, M. C.; Buchwald, S. L. Tetrahedron Lett. 1998, 39, 5327-5330.
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Harris, M.C.2
Buchwald, S.L.3
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65
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0344118289
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note
-
We thank Dr. Joseph Fox for this suggestion.
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68
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0345412157
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note
-
This compound is also available from Aldrich Chemical Co.
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70
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0001029926
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Kranenburg, M.; van der Burgt, Y. E. M.; Kamer, P. C. J.; van Leeuwen, P. W. N. M.; Goubitz, K.; Fraanje, J. Organometallics 1995, 14, 3081-3089.
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Van Der Burgt, Y.E.M.2
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Goubitz, K.5
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