Steric Variations between the Synthesis of a Stable ChiralC 2-Symmetric Diimidazolidinylidene and an Electron-Rich Tetraazafulvalene

C 2-Symmetric electron-rich olefin dimers and imidazolidinylidene ligands with a 2,2-dimethyl-1,3-dioxolane backbone were synthesised and characterised. The steric protection of the carbene dictates which product is obtained.