Abstract:In this study, mesoporous and nonporous silica-supported Pd complexes were synthesized and characterized. Variable-temperature XAFS measurements and a curve-fitting analysis showed a slightly larger contribution of σ 2 static when the Pd complexes were on a nonporous support in comparison to a mesoporous support. In contrast, the catalytic performance of the attached Pd complex in the Suzuki-Miyaura cross-coupling reaction was not affected by such small differences in the static disorder of the Pd complex.
Triphenylborane was unexpectedly formed from phenylboronic acid in the presence of an inorganic base and a polar solvent. When K2CO3 was used as the base and DMF was used as the solvent, 0.22 mmol of triphenylborane was obtained from 1.5 mmol of phenylboronic acid after 1 h at 130 °C. The in‐situ formed triphenylborane reacted with chorobenzene over a supported Pd catalyst to afford biphenyl as the cross coupling product.
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