The Tebbe reagent, [Cp2Ti(μ2-Cl)(μ2-CH2)AlMe2] (1), has finally been structurally characterized due to the fortuitous formation of cocrystals of 1 and [Cp2Ti(μ2-Cl)2AlMe2] (2). Single crystals of 1 and 2, despite being extremely reactive and forming an amorphous white coat, can be mounted and data collected to high resolution, thereby providing for the first time a solid-state representation of a titanium methylidene adduct with diphilic AlClMe2.

Two alkali metal phenolate/phenol complexes are reported. The cations are pseudo-octahedrally coordinated by oxygen atoms and the π-systems of phenolates and solvent phenols. The ratio of phenolate/phenol determines whether the oxygen atom of the phenolate participates in the coordination of the metal. In cesium phenolate · 2 phenol, both phenolate and phenol solvent coordinate the metal via oxygen and the π-system, whereas in rubidium phenolate · 3 phenol, the phenolate oxygen is excluded from coordination and instead linked via hydrogen bonds to the phenol solvent. In both structures, the coordination polyhedra share edges or faces and form infinite chains.Rubidium phenolate · 3 phenol and cesium phenolate · 2 phenol form extended one-dimensional structures, with the cations pseudo-octahedrally coordinated by oxygen atoms and the π-system of phenolates and solvent phenols. The phenolate ion’s participation in the coordination is dependent on the solvent content.