Neutral Di- and Triesters of Phosphorous Acid

Triarylphosphites are obtained, analogously to the phosphoric acid esters, by the reaction of phosphorus(V) oxychloride with phenols  

Manufacture of triarylphosphites from phosphorus(V) oxychloride and phenols 

In view of their extreme sensitivity to hydrogen chloride, the synthesis of aliphatic phosphorous acid triesters from phosphorus(V) oxychloride and alcohols can only be carried out in the presence of a molar mixture with inorganic or organic bases  

Cooling is necessary, because the reaction is very exothermic. The operated processes differ in the reaction conditions used (solvent, temperature), the base employed and the working up of the reaction mixture. The ester can be purified by distillation. 

Manufacture of trialkylpho.sphite.s from phosphorus V) oxychloride and alcohols in the presence of bases 

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