Simler, Thomas published the artcileDirect synthesis of doubly deprotonated, dearomatised lutidine PNP Cr and Zr pincer complexes based on isolated K and Li ligand transfer reagents, Category: pyridine-derivatives, the publication is Dalton Transactions (2016), 45(7), 2800-2804, database is CAplus and MEDLINE.
Chromium and zirconium complexes with dearomatized double deprotonated 2,6-bis[(di-tert-butylphosphino)methyl]pyridine were prepared by transmetalation of potassium and lithium salts. Double deprotonation of 2,6-bis-(di-tert-butylphosphinomethyl)-pyridine (tBuPNtBuP), with KCH2C6H5 afforded K2(tBuP*NatBuP*), Na = anionic amido N, tBuP* = di-tert-Bu 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), resp. DFT calculations support dearomatization of P*NaP* and its high donor ability.
Dalton Transactions published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C10H16Br3N, Category: pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem