Upper-rim monofunctionalization of calix[4]arene by organometallic diphenylphosphinorhodium complexesElectronic supplementary information (ESI) available: synthesis and characterisation of compounds 2–5. See http://www.rsc.org/suppdata/cc/b0/b001485k/

Abstract

Monofunctionalization of the calix[4]arene upper-rim is achieved by lithiation with BuⁿLi, followed by phosphination with Ph₂PCl of monobromotetra-n-propoxycalix[4]arene; subsequent reactions with [Cp*Rh^IIICl₂]₂ and Cp*Rh^I(CO)₂ provide the corresponding Cp*[Ph₂(calix)P]Rh^IIICl₂, which can be converted to Cp*[Ph₂(calix)P]Rh^III(H)₂ and Cp*[Ph₂(calix)P]Rh^I(CO), respectively.