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2.10.10 Product Subclass 10: Titanium–Alkyne Complexes

DOI: 10.1055/sos-SD-002-00576

Mikami, K.; Matsumoto, Y.; Shiono, T.Science of Synthesis, (20032555.

The displacement of two phosphines by one alkyne ligand suggests that an alkyne group can act as a four- as well as a two-electron ligand. 13C NMR chemical shift values are a good indication of the bonding mode: generally δCC values of ca. 100150 indicate a two-electron alkyne donor. (By contrast, alkyne groups are one-electron donors towards nickel.) For alkynetitanium complexes, both IR and NMR spectroscopy show that alkynes are four-electron ligands.[‌353‌] The low Δν(CC) value of [Ti(Cp)2(PhCCPh)] (198) shows that its structure is closer to that of a titanacyclopropene.[‌331‌]

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