X-H (X = C, N, O, P, S) bond activations induced by beta-heterosubstitutedzirconaindenes

The azazirconacyclopentene-substituted phosphines 3 and 4 have been found t o activate the C-H bonds of acetylenic systems, such as methylpropiolate, d iphenylphosphinoacetylene and phenylacetylene, or of methylene compounds, s uch as malonitrile and diethylmalonate, to give complexes 5a-c, 6a and 6b. C-H bond activation also takes place with vinylacetate. Similar reactions w ith amines, alcohols, enolisable ketones, phenols, phosphonates, thiols and a second-generation SH-terminated dendrimer lead through X-H bond activati on (X = N, O, P, S) to new complexes 8a-c, 9, 12a,b, 13, 14ac, 15, 16a and 16b. The azazirconacyclopentene-substituted amine 20 reacts to form analogo us complexes. Zr-X bonds of these complexes (X = C, N, O, S) can be cleaved with diphenylchlorophosphine to give P-X phosphorus derivatives in high yi eld.