Metallocene complexes of the Group 3 metals and lanthanides have been utilized for cyclization/silylation reactions of polyunsaturated organic substrates. Acyclic dienes, trienes, enynes, and dienynes can be selectively cyclized to provide fiveand six-membered rings in high yields.

Two different hybrid cavitand-resorcin[4]arenes are shown to be effective and selective receptors for the molecular inclusion of positively charged organometallic sandwich complexes of appropriate size. The binding constants of the 1 : 1 complexes formed with a series of neutral and positively charged metallocenes have been calculated using different titration techniques. The motion of the incl...

This account critically surveys the field of side-chain transition metal-containing polymers as prepared by controlled living ring-opening metathesis polymerization (ROMP) of the respective metal-incorporating monomers. Ferrocene- and other metallocene-modified polymers, macromolecules including metal-carbonyl complexes, polymers tethering early or late transition metal complexes, etc. are here...

Alkali metal complexes of two types of ansa-tris(allyl) ligand are reported; a monoanionic ansa-tris(allyl) ligand containing tin(II) is formally valence isoelectronic to the cyclopentadienyl ligand and a trianionic ansa-tris(allyl) ligand containing silicon(IV) is formally valence isoelectronic to an ansa-metallocene ligand; the potential wider use of these tripodal ligands in coordination che...

Ferrocene and Ruthenocene are dicyclopentadienyl complexes, where the metal (Fe and Ru) is sandwiched between two cyclopentadienyl structures. The paper describes a comparative study of the electronic and geometric structural properties of ferrocene and ruthenocene. The various physical properties (stability, geometry, symmetry etc.) of the two are reviewed to elucidate the differences between ...

Non-bridged half-metallocene dimethyl complexes of group 4 metals 2a-4a with an N-4-methoxyphenyl(iminomethyl)pyrrolyl ligand 1a were synthesized and characterized by NMR spectroscopy and X-ray analysis. Upon activation with [Ph3C][B(C6F5)4], these complexes became active catalysts for the polymerization of 1-hexene. A series of hafnium complexes with various N-substituents on the imine group o...

Cyclometallated complexes are well-known and have found many applications. This article provides a short review on the progress made in synthesis application to catalysis of cyclometallated half-sandwich Cp*Ir(III) (Cp*: pentamethylcyclopentadienyl) since 2017. Covered iridacycles featuring conventional C,N chelates less common metallocene carbene-derived C,C ligands. is followed by an overview...