Cyclocondensations of Amidophenacylation Products of Triphenylphosphoranylideneacetonitrile

摘要

When heated in polyphosphoric acid,the products of amidophenacylation of the available tri-phenylphosphoranylideneacetonitrile 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-l,3-oxazol-4-ylmethyl)triphenylphosphonium perchlorates and [2-aryl-5-hydroxyna-phtho[2,l-d][l,3]oxazol-4-yl]triphenylphosphonium perchlorates.The first of these products was identified by alkaline dephosphorylation,and the structure of one of the representatives of the second class of compounds was established by X-ray diffraction.