X-H (X = C, N, O, P, S) bond activations induced by beta-heterosubstituted zirconaindenes |
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Authors: | Cadierno V Zablocka M Donnadieu B Igau A Majoral J P Skowronska A |
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Institution: | Laboratoire de Chimie de Coordination du CNRS, Toulouse, France. majoral@lcc-toulouse.fr |
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Abstract: | The azazirconacyclopentene-substituted phosphines 3 and 4 have been found to activate the C-H bonds of acetylenic systems, such as methylpropiolate, diphenylphosphinoacetylene and phenylacetylene, or of methylene compounds, such as malonitrile and diethylmalonate, to give complexes 5a-c, 6a and 6b. C-H bond activation also takes place with vinylacetate. Similar reactions with amines, alcohols, enolisable ketones, phenols, phosphonates, thiols and a second-generation SH-terminated dendrimer lead through X-H bond activation (X = N, O, P, S) to new complexes 8a-c, 9, 12 a,b, 13, 14a-c, 15, 16a and 16b. The azazirconacyclopentene-substituted amine 20 reacts to form analogous 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 yield. |
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