Synthesis of Functionalized (η5 -Indenyl)rhodium(III) Complexes and Their Application to C-H Bond Functionalization

Jyunichi Terasawa; Yu Shibata; Yuki Kimura; Ken Tanaka

doi:10.1002/asia.201701716

Synthesis of Functionalized (η⁵ -Indenyl)rhodium(III) Complexes and Their Application to C-H Bond Functionalization

Chem Asian J. 2018 Mar 2;13(5):505-509. doi: 10.1002/asia.201701716. Epub 2018 Feb 1.

Authors

Jyunichi Terasawa¹, Yu Shibata¹, Yuki Kimura¹, Ken Tanaka¹

Affiliation

¹ Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan.

PMID: 29336528
DOI: 10.1002/asia.201701716

Abstract

It has been established that reductive complexation of functionalized benzofulvenes, which are readily prepared from commercially available indene and 2-methylindene, with RhCl₃ in ethanol affords the corresponding indenyl-rhodium(III) dichlorides bearing substituents at the 1- (H or CO₂ Et), 2- (H or Me), and 3- [CH₂ Ph or CH₂ (2-MeOC₆ H₄ )] positions. The indenyl-rhodium(III) complexes bearing one ethoxycarbonyl group showed higher thermal stability and regioselectivity than our previously reported Cp^E Rh^III complex toward the oxidative [3+2] annulation of acetanilides with internal alkynes.

Keywords: C-H activation; benzofulvenes; indenyl complexes; reductive complexation; rhodium.