Indenyl complexes of Group 9 metals: Synthetic and catalytic chemistry

摘要

Since their discovery in 1953, indenyl complexes of Group 9 metals have attracted much attention, due to their high performances in many catalytic processes. The indenyl effect, which is expressed in the facilitation of auxiliary ligand substitution as a result of eta(5)-eta(3) isomerization of indenyl ligand, allows to formation of an addition vacant coordination site. At the same time, this structural flexibility imposes restrictions on the synthesis of indenyl complexes. In the recent years, significant progress has been achieved in the development of their synthetic methods, especially Rh(III) and 1011) derivatives, which has triggered new interest in catalytic application of such compounds. The present review starts with a description of the synthesis and reactivity of cobalt, rhodium and iridium complexes bearing indenyl ligand. At the end, their catalytic applications are given. The influence of the ligand environment and the indenyl effect on the catalytic activity is discussed. (C) 2019 Elsevier B.V. All rights reserved.