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The reaction between the corresponding diazonium salt and phenyltrifluoroborate was performed under ligandless conditions with similar results. See ref 13a.
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2 have been used to perform the homocoupling of both electron-poor and electron-rich arylboronic acids. See ref 11.
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The cross-coupling and homocoupling products are highly sensitive to light and sublime at room temperature, accounting for the low recovery of product.
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Several byproducts arising from substitution of the chlorine atoms by ethoxy groups and/or coupling with the aryltrifluoroborates were detected by GC-MS analysis, in trace levels, which accounts for the conversion of the remaining 20-30% of halide 2ac, for entries 2-4, Table 9.
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Under these conditions, the reactions with the more electron deficient methyl 5-bromonicotinate afford high yields of products after 2-6 h. (a) Thompson, W. J.; Gaudino, J.J. Org. Chem. 1984, 49, 5237-5243. (b) Thompson, W. J.; Jones, J. H.; Lyle, P. A.; Thies, J. E. J. Org. Chem. 1988, 53, 2052-2055.
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