Addition of Diphenylphosphine to Two Molecules of 1,4-Naphthoquinone

Аннотация

According to NMR data, diphenylphosphine reacted with two equivalents of 1,4-naphthoquinone under mild conditions to form betaine, 1',4'-dihydroxynaphth-2'-yl-diphenylphosphonium (1-hydroxynaphth-2-yl-4-ate), which was converted to bis(1,4-dihydroxynaphth-2-yl)diphenylphosphonium salts when treated with hydrogen bromide or trifluoracetic acid.