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Trans -oxanes are important liquid crystals. The commonly used techniques for the synthesis were to react 2-substituted propylene glycols with substituted formaldehydes. Such process produces toxic  cis -oxanes, which are harmful to the environment. The  cis  to  trans  isomerization of wasted  cis -oxanes was studied in the presence of p-toluenesulfonic acid as catalyst. The yield of  cis  to  trans  conversion was over 70%, which was much higher than 42–69% when traditional methods were employed. The total yield of the new method was increased to 90%. Further investigation of effects of catalysts, reaction times, temperatures on the  cis-trans  conversion was carried out. Proposed mechanism of this process for the conversion was discussed.

Facile conversion of cis into trans oxane as liquid crystals