Direct synthesis of doubly deprotonated, dearomatised lutidine PNP Cr and Zr pincer complexes based on isolated K and Li ligand transfer reagents

Abstract : Double deprotonation of 2,6-bis-(di-tert-butylphosphinomethyl)-pyridine (tBuPNtBuP), with KCH2C6H5 afforded K2(tBuP*NatBuP*), Na = anionic amido N, tBuP* = di-tert-butyl vinylic P donor. The analogous [Li2(tBuP*NatBuP*)]2 (1) was reacted with [CrCl2(THF)2] and [ZrCl4(THT)2] to give the helical [Cr{Cr(tBuP*NatBuP*)Cl}2] (2) and [Zr(tBuP*NatBuP*)Cl2] (3), respectively. DFT calculations support dearomatisation of P*NaP* and its high donor ability.
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Thomas Simler, Gilles Frison, Pierre Braunstein, Andreas A. Danopoulos. Direct synthesis of doubly deprotonated, dearomatised lutidine PNP Cr and Zr pincer complexes based on isolated K and Li ligand transfer reagents. Dalton Transactions, Royal Society of Chemistry, 2016, 45 (7), pp.2800-2804. ⟨10.1039/c6dt00144k⟩. ⟨hal-01260140⟩

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