Five-membered Rings with Two Adjacent Heteroatoms with at least One Other Element

摘要: This chapter covers reports on ring systems with two adjacent heteroatoms and at least one other element up to the end of 2005. Physical properties, reactivity (ring its substituents), syntheses such metallaheterocyclopentanes are decribed. To simplify access for reader, it has proved easier present metallaheterocycles in order position their key heteroatom periodic table. Furthermore, contast CHEC-II(1996) where only rings which have relatively strong σ-bonds between atoms were reviewed, heterocyclic complexes also been reviewed. The chemistry ‘chelates’ or ‘coordination compounds’ is very interesting as carbon–metal bond labile subject various reactions insertion, protonation, substitution.