Kinetic studies prove high catalytic activity of a diene-rhodium complex in 1,4-addition of phenylboronic acid to alpha,beta-unsaturated ketones.
In the 1,4-addition of phenylboronic acid to alpha,beta-unsaturated ketones, [Rh(OH)(cod)]2 has a much higher catalytic activity than [Rh(OH)(binap)]2 (cod = 1,5-cyclooctadiene, binap = 2,2'-bis(diphenylphosphanyl)-1,1'-binaphthyl). Kinetic studies revealed that the rate-determining transmetalation step in the catalytic cycle has a large rate constant when [Rh(OH)(cod)]2 is used.
Kina
Asato
A
Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
Yasuhara
Yuichi
Y
Nishimura
Takahiro
T
Iwamura
Hiroshi
H
Hayashi
Tamio
T