Synthesis and reduction chemistry of mixed-Lewis-base-stabilised chloroborylenes.

ABSTRACT: The one-electron reduction of (CAAC^Me)BCl₃ (CAAC^Me = 1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene) yields the dichloroboryl radical [(CAAC^Me)BCl₂]˙. Furthermore, the twofold reduction of (CAAC^Me)BCl₃ in the presence of a range of Lewis bases (L = CAAC^Me, N-heterocyclic carbene, phosphine) yields a series of doubly base-supported (CAAC^Me)LBCl chloroborylenes, all of which were structurally characterised. NMR and UV-vis spectroscopic and electrochemical data for (CAAC^Me)LBCl show that the boron centre becomes more electron-rich and the HOMO-LUMO gap widens as L becomes less π-accepting. A [(CAAC^Me)BCl₂]^- boryl anion coordination p

SUBMITTER: Arrowsmith M 

PROVIDER: S-EPMC6531816 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature