Homogeneous Model Complexes for Supported Rhenia Metathesis Catalysts
摘要:
A series of rhenium trioxo complexes (L-ReO3) was synthesized, characterized, and demonstrated to be active in olefin metathesis. The relationship between perrhenate (ReO4-), perrhenyl (ReO3+), and metathesis-active rhenium complexes (L-ReO3) was elucidated. Their chemical behavior can be tuned through the Lewis acid-base interaction. DFT calculations were performed for the metathesis reaction of L-ReO3 with norbornene, which demonstrates that electron-withdrawing substituents or ligands are beneficial for olefin metathesis activity. Moreover, a rhenium-alkylidene complex was synthesized, which can be activated by B(C6F5)(3) to afford an active metathesis catalyst. This be regarded as a homogeneous model of the hypothetical species present in the heterogeneous catalytic systems. The findings from the present study are consistent with our previous gas-phase studies and constitute the elucidation of the working principles for the metathesis-active rhenium species on the surface.
Novel B(Ar′)<sub>2</sub>(Ar′′) hetero-tri(aryl)boranes: a systematic study of Lewis acidity
作者:Robin J. Blagg、Trevor R. Simmons、Georgina R. Hatton、James M. Courtney、Elliot L. Bennett、Elliot J. Lawrence、Gregory G. Wildgoose
DOI:10.1039/c5dt03854e
日期:——
Nine homo- and hetero-tri(aryl)boranes related by stepwise aryl substitutions, are studied for H2 cleavage as part of an FLP, and comparative Lewis acidity/electrochemical measurements discussed.