Expanding the tools available for direct ortho cupration - Targeting lithium phosphidocuprates

P J Harford, J Haywood, M R Smith, B N Bhawal, Paul R Raithby, M Uchiyama, A E H Wheatley

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/27fe5a35-3043-4988-a4cf-4bed0412907c • DOI: https://doi.org/10.1039/c2dt12415g

Reaction of in situ generated lithium phosphides with 0.5 eq. Cu(i) is employed as a means of targeting lithium phosphidocuprates of either Gilman- or Lipshutz-type formulation - e.g., (R 2P) 2CuLi·n(LiX) (n = 0, 1). For R = Ph, X = CN in toluene followed by thf or R = Ph, X = I in thf/toluene an unexpected product results. [(Ph 2P) 6Cu 4][Li·4thf] 21 reveals an ion-separated structure in the solid state, with solvated lithium cations countering the charge on an adamantyl dianion [(Ph 2P) 6Cu 4] 2-. Deployment of R = Ph, X = CN in thf affords a novel network based on the dimer of Ph 2PCu(CN)Li·2thf 2 with trianions based on 6-membered (PCu) 3 rings acting as nodes in the supramolecular array and solvated alkali metal counter-ions completing the linkers. Cy 2PLi (Cy = cyclohexyl) has been reacted with CuCN in thf/toluene to yield Gilman-type lithium bis(phosphido)cuprate (Cy 2P) 2CuLi·2thf 3 by the exclusion of in situ generated LiCN. A polymer is noted in the solid state.