Abstract
The title complex Cp2ZrCl(CH2PPh2) reacts with B(C6F5)3 under specific conditions by phosphinomethyl transfer to give the phosphane-stabilized salt [Cp2ZrCl+][Ph2PCH2B(C6F5)3–]. X-ray crystal structure analysis showed the P–Zr coordination. This salt is trapped by phenyl isocyanate in an in situ three-component reaction to yield the respective P/Zr+ frustrated Lewis pair (FLP) addition product. In contrast, a mixture of Cp2ZrCl(CH2PPh2)/B(C6F5)3 and benzaldehyde under similar conditions gives the P/B FLP addition product. The Cp2ZrCl(CH2PPh2)/B(C6F5)3 system may form a P/B adduct [Cp2ZrCl(CH2PPh2)·B(C6F5)3] or a P/Zr+ adduct [Cp2ZrCl·PPh2CH2B(C6F5)3]. From the former it seems to show P/B FLP reaction and from the latter P/Zr+ FLP behavior; the outcome is dependent on the specific reagent and reaction conditions chosen.
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