How is 2,2'-[(9Z)-9-Octadecen-1-ylimino]diethanol (CAS: 13127-82-7) typically synthesized?

2,2'-[(9Z)-9-Octadecen-1-ylimino]diethanol is synthesized by the condensation of 1-decene-9-imine with ethylene glycol in the presence of a catalyst such as p-toluenesulfonic acid. The reaction is carried out at room temperature, and the yield is typically around 80%. The use of imine and diol moieties allows for high selectivity and good purity of the product.