Synthesis of Chiral Titanocene and Zirconocene Dichlorides

Cyclopentadienide Ligand CpC– Possessing Intrinsic Helical Chirality and Its Ferrocene Analogues

“…A large number of helically chiral Cp complexes have been reported for early transition metal elements, namely, by generation of ansa -bridged di-Cp ligands containing tetrahydroindenide fragments . Such compounds are strongly related to the corresponding ansa -bridged diindenide complexes, e.g., of the group IV elements, which are often highly active catalysts for propene polymerization and provide polypropylene with well-defined tacticities . Here the chirality of the transition metal complex is not due to a chiral Cp fragment but due to the ansa -bridging, resulting in a chiral and an achiral (meso) stereoisomer.…”

Synthesis of Aryl- and Heteroaryl-Substituted Cyclopentadienes and Indenes and their Use in Transition Metal Chemistry

“…Planar chiral cyclopentadienyl metal complexes feature amongst the more successful asymmetric catalysts, however, obtaining them in enantiomerically pure form is often problematic [70]. They are often obtained in enantiomerically pure form through resolution procedures, there being relatively few methodologies allowing for asymmetric synthesis.…”

Synthesis, structure and DFT study of dinuclear iron, cobalt and nickel complexes with cyclopentadienyl-metal moieties

“…IR (Nujol mull, 4000-400 cm -1 ): 945 (P-C), 1584 (C C), 3050 (ArC-H). 1 H NMR (300 MHz, C 6 D 6 , 296 K, ppm): 0.085 (dd, 3 J P,H = 3 J P¢,H = 7.9 Hz, 3H, MCH 3 ); 0.329 (s, 3H, MCH 3 ); 0.442 (d, 2 J P,H = 7.2 Hz, 9H, PMe 3 ); 0.591 (d, 2 J P,H = 7.8 Hz, 9H, PMe 3 ); 3.885-5.785 (m, 8H, C 5 H 4 ); 6.499-8.148 (m, 20H, C 6 H 5 ). 31 P NMR (121 MHz, C 6 D 6 , 296 K, ppm): 3.99 (d, 2 J P,P = 64.6 Hz, 1P, PMe 3 ); 30.25 (d, 2 J P,P = 48.2 Hz, 1P, PMe 3 ); 57.81 (d, 2 J P,P = 65.1 Hz, 1P, PPh 2 ); 62.05 (d, 2 J P,P = 52.4 Hz, 1P, PPh 2 ).…”