Anionic N-heterocyclic carbene complexes of gold(I) as precatalysts for silver-free cycloisomerization of enynes

Stéphanie Bastin (1) , Cécile Barthes (1) , Noël Lugan (1) , Guy Lavigne (1) , Vincent César (1)

1 LCC - Laboratoire de chimie de coordination

The anionic malonate-derived N-heterocyclic carbene maloNHC readily and efficiently reacts with AuCl(tht) to generate the corresponding anionic gold(I) complexes of type [(maloNHC)AuCl](M). A stoichiometric reaction of these complexes with triphenylphosphine affords the zwitterionic complex [(maloNHC)Au(PPh3)]. Although totally insoluble in the reaction medium, the [(maloNHC)AuCl](M) salts were shown to be suitable precatalysts for the cycloisomerization of 1,6-enynes through the in situ generation of soluble zwitterionic catalytic species of the type [(maloNHC)Au].

Domaines: Chimie de coordination

Stéphanie Bastin, Cécile Barthes, Noël Lugan, Guy Lavigne, Vincent César. Anionic N-heterocyclic carbene complexes of gold(I) as precatalysts for silver-free cycloisomerization of enynes. European Journal of Inorganic Chemistry, 2015, 13, pp.2216-2221. ⟨10.1002/ejic.201500168⟩. ⟨hal-01909389⟩