Synthesis of carborane-fused carbo- and heterocycles via zirconacyclopentane intermediates†
Abstract
A variety of carborane-fused carbo- and heterocycles were prepared in good to high isolated yields via the reaction of carborane-fused zirconacyclopentane with a series of substrates such as S8, Se, Te, CO, XylNC, MeOOC–CHN2, PhPCl2, nBu2SnCl2 and Me2GeCl2. However, it was found that the Zr–C bond in the zirconacyclopentane did not show any reactivity towards PhBCl2, PhCN and PhCHNPh. This approach represents a promising route to functionalized carboranes that are difficult to access by conventional methods.