Some ruthenium complexes of fluorinated alkynylcyclopentenes

Reactions between 1,2-dichlorohexafluorocyclopentene and Ru(Ctriple bond; length of mdashCH)(dppe)Cp∗ or Ru(Ctriple bond; length of mdashCCtriple bond; length of mdashCLi)(dppe)Cp∗ have given Ru(Ctriple bond; length of mdashC-c-C5F6Cl-2)(dppe)Cp∗ 4 and Ru(Ctriple bond; length of mdashCCtriple bond; length of mdashC-c-C5F6Cl-2)(dppe)Cp∗ 7, respectively. Ready hydrolysis of 4 to the ketone Ru{Ctriple bond; length of mdashC[c-C5F4Cl(O)]}(dppe)Cp∗ 5 occurs, which can be converted to Ru{Ctriple bond; length of mdashC(c-C5F4Cl[double bond; length as m-dashC(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.