Authors: Shinji Tsukada Kenji Wada Hiroki Miura Saburo Hosokawa Ryu Abe Masashi Inoue
Publish Date: 2015/04/05
Volume: 41, Issue: 12, Pages: 9575-9586
Abstract
Oxidesupported rhodium catalysts with excellent activity in silylative coupling reactions have been developed Reductive pretreatment of the catalysts in the presence of 05 equiv triphenylphosphine under a hydrogen atmosphere enhanced and stabilized the catalytic activity Of the catalysts examined ceriasupported rhodium had the highest activity in the homocoupling of vinylsilanes to bissilylethenes at 170 °C A zirconiasupported catalyst selectively gave E1aryl2silylethenes by crosscoupling of vinylsilanes with styrenes at 130 °C and a high turnover frequency of 8200 h−1 was achieved at 170 °C Spectroscopic studies revealed that welldispersed surface rhodiumI species predominantly formed on ceria or zirconia were transformed into rhodium hydride species which are believed to be responsible for the high activity These catalysts were recyclable without loss of activity and leaching of rhodium species from the catalysts was not observed
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