“ONE-POT” SYNTHESIS OF TRIARYL PHOSPHATES A REACTION CALORIMETRY APPROACH

Abstract

Triaryl phosphates were obtained in yields ranging from 85–96× in a “one-pot” synthesis via an alkaline route: an ethanolic solution of sodium hydroxide was added to a solution of substituted phenol in toluene. The mixture was distilled until all ethanol was removed. Phosphorus oxychloride was then added and the toluene was distilled. The triaryl phosphates were characterized by NMR (1H and 31P), MS and FTIR. The heat capacity (CP, the total heat transfer coefficient (U) and the reaction enthalpy (ΔH) were determined for the synthesis of tris(4-chloro-3-methylphenyl), tris(p-cresyl), tris(o-methoxyphenyl) and tris(p-nitrophenyl) phosphates.