1.
Angew Chem Int Ed Engl
; 57(37): 11929-11933, 2018 Sep 10.
Article
in English
| MEDLINE
| ID: mdl-30051582
ABSTRACT
Inspired by the commercially available azoimidazolium dyes (e.g., Basic Redâ 51) that can be obtained from aryldiazonium salts and N-heterocyclic carbenes, we developed the synthesis of a unique set of arylazophosphonium salts. A range of colours were obtained by applying readily tuneable phosphine donor ligands and para-substituted aryldiazonium salts as nitrogen-based Lewis acids. With cyclic voltammetry, a general procedure was designed to establish whether the reaction between a Lewis acid and a Lewis base occurs by single-electron transfer or electron-pair transfer.