Highly dispersed Pd species active in the Suzuki-Miyaura reaction.
Structures of Pd/zeolites immersed in solvents were measured by in situ X-ray absorption fine structure (XAFS). Systematic studies revealed that the selection of an appropriate support (USY-zeolite), thermal treatment temperature of USY, solvent (o-xylene), H(2) partial pressure (6%), and the use of a Pd amine complex affect the structure of Pd. As a result, we found that monomeric Pd can be obtained in the USY support with H(2) bubbling in o-xylene. The structural properties of Pd correlate well with its catalytic performance in the Suzuki-Miyaura coupling reactions; a very high TON of up to 11,000,000 was obtained over the monomeric Pd.
Okumura
Kazu
K
Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori-city, Tottori, Japan. okmr@chem.tottori-u.ac.jp
Matsui
Hirosuke
H
Tomiyama
Takuya
T
Sanada
Takashi
T
Honma
Tetsuo
T
Hirayama
Sayaka
S
Niwa
Miki
M