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A series of spirocyclic monoorganosilicon compounds of the form RSi(OPO)2Cl (R = phenyl (1), p-tolyl (2), benzyl (3), Me (4), tBu (5), thexyl (6); OPO = 1-oxo-2-pyridinone) was synthesized and characterized by 1H, 13C, and 29Si NMR spectroscopy, X-ray crystallography, and elemental analysis. In the solid state, complexes 1–3 are neutral and possess cis-OPO ligands in an octahedral arrangement and complexes 4–6 are cationic and possess effectively trans-OPO ligands in nearly ideal square-pyramidal geometries along the Berry pseudorotation coordinate. In 4–6, chloride dissociation is attributed to the additive effect of multiple intermolecular C–H···Cl interactions in their crystals. In DMSO-d6 solution, compounds 1–6 form cationic hexacoordinate DMSO adducts with trans-OPO ligands, all of which undergo dynamic isomerization with energy barriers of ∼18–19 kcal/mol. Compounds with better leaving groups, (p-tolyl)Si(OPO)2X (X = I (7), X = triflate (8)), exhibit solution NMR spectra identical with those of 2, ...

Neutral and Cationic Bis-Chelate Monoorganosilicon(IV) Complexes of 1-Hydroxy-2-pyridinone