Anja R Elsagir, F. Gassner, H. Görls
Mar 15, 2000
Citations
0
Influential Citations
26
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract The chiral 1,1′-bis(di(+)-menthylphosphino)ferrocene (dmenpf, 1b ) and achiral 1,1′-bis(diisopropylphosphino)ferrocene (disoppf, 1a ) were prepared from the corresponding tertiary chlorophosphines 2b and 2a and the dilithiated ferrocene–TMEDA complex as analytically pure crystals. The synclinic eclipsed conformation of the Cp rings and the Cp(1)FeCp(1)′ angle in 1b was determined to be 175.0(2)° by X-ray structure analysis. With H 2 [PdCl 4 ] 1a forms the bimetallic complex (disoppf)PdCl 2 ( 3a ). In contrast to the structure of the free ligand disoppf ( 1a ), the X-ray structure of 3a and the NMR spectra in solution as well as in the solid state show that the P atoms are chemically and magnetically equivalent. The conformation of the Cp rings converts from an eclipsed to a staggered conformation. The ferrocene-based ligands show significant activity in the Pd-catalysed cooligomerisation of 1,3-butadiene with CO 2