1,2-Bis(tosyloxy)ethane from Aladdin Scientific Corporation

It has been used in the synthesis of:1.cyclohexyl-fused 1,4,7-triazacyclononane;2.1,2-ethylenecalix[6]arene, 1,3- and 1,4-calix[6]crown-3, 1,3- and 1,4-calix[6]crown-4, 1,4-calix[6]benzocrown-4, 1,2- and 1,3-calix[6]crown-5