Elimination reactions in 1,4-diphosphinine chemistry: mixed-valence intermediates and 1,1- vs. 1,4-elimination pathways

Abstract

Addition of LiOH to I (E = S, N-nPr), followed by tautomerisation of the anionic intermediate to the P(O)H group is described. Subsequent protonation yielded II and (probably) III as highly reactive intermediates which eliminated water upon warming.