Some ruthenium complexes of fluorinated alkynylcyclopentenes

Abstract

Reactions between 1,2-dichlorohexafluorocyclopentene and Ru(C{triple bond, long}CH)(dppe)Cp* or Ru(C{triple bond, long}CC{triple bond, long}CLi)(dppe)Cp* have given Ru(C{triple bond, long}C-c-C5F6Cl-2)(dppe)Cp* 4 and Ru(C{triple bond, long}CC{triple bond, long}C-c-C5F6Cl-2)(dppe)Cp* 7, respectively. Ready hydrolysis of 4 to the ketone Ru{C{triple bond, long}C[c-C5F4Cl(O)]}(dppe)Cp* 5 occurs, which can be converted to Ru{C{triple bond, long}C(c-C5F4Cl[{double bond, long}C(CN)2])}(dppe)Cp* 6 by treatment with CH2(CN)2/basic alumina. Spectroscopic, electrochemical and XRD structural studies for 4-7 are reported: for 6, these suggest that the cyanated fluorocarbon ligand is a very powerful electron-withdrawing group. © 2009.