Reductive activation of carbon-fluorine bonds in perfluoroalkyl ligands: an unexpected route to the only known tetrafluorobutatriene transition metal complex: Ir(eta 5-C5Me5)(PMe3)(2,3-eta 2 -CF2[double bond]C[double bond]C[double bond]CF2).
Six-electron reduction of the perfluoro-sec-butyl ligand in Cp*Ir(PMe3)I(C4F9) with sodium naphthalenide affords the first known example of a transition metal complex of tetrafluorobutatriene, Cp*Ir(PMe3)(C4F4). The free ligand is a highly unstable compound. The compound has been completely characterized by a single-crystal X-ray diffraction study; the center coordinated double bond shows significant elongation, and the flanking fluoroalkenes show significant shortening, as compared to the dimensions in the free ligand.
Hughes
Russell P
RP
Department of Chemistry, 6128 Burke Laboratory, Dartmouth College, Hanover, New Hampshire 03755,USA. rph@dartmouth.edu
Laritchev
Roman B
RB
Zakharov
Lev N
LN
Rheingold
Arnold L
AL