W. Malisch, Norbert Gunzelmann, K. Thirase
Dec 1, 1998
Citations
0
Influential Citations
9
Citations
Journal
Journal name not available for this finding
Abstract
The inversion barriers of dicarbonyl(cyclopentadienyl)ferrio-phosphanes are determined using chirally modified cyclopentadienyl-ligands. Synthesis is achieved by deprotonation of the cationic primary or secondary phosphane iron complexes {R*C5Hn(OC)2[H(R)(Mes)P]Fe}BF4 (R=H, Ph; R*=NM=Neomenthyl; n=4; R=H; R*=Pi=Pinen-fused; n=3) (4a–c) with KOtBu to give R*C5Hn(OC)2Fe–P(Mes)R (R*=NM, Pi; R=H, Ph) (6a–c). Reaction of 6a with MeI yields {NMC5H4(OC)2[H(Me)(Mes)P]Fe}I (8), which is converted with KOtBu to NMC5H4(OC)2Fe-P(Mes)Me (9). The inversion barrier of the ferrio-phosphanes is determined by NMR-spectroscopy to be 17.3 (6a), 16.4 (6b), 18.0 (6c) and >16.8 (9) kcal mol−1.