Abstract When heated in polyphosphoric acid, the products of amidophenacylation of the available triphenylphosphoranylideneacetonitrile undergo the Robinson-Gabriel cyclization followed by other transformations. Treatment of the resulting mixture with sodium perchlorate gave quaternary phosphonium salts of two types, viz.(2, 5-diaryl-1, 3-oxazol-4-ylmethyl) triphenylphosphonium perchlorates and [2-aryl-5-hydroxynaphtho [2, 1-d][1, 3] oxazol-4-yl ...
