Epichlorohydrin has proved to be a versatile sidearm precursor for a variety of lariat ether compounds <1992CSR39>.It has recently been used for the formation of macrorings by reaction of the oxirane fragment (see Figure 19).Thus, epichlorohydrin was treated with BF 3 ·Et 2 O to give an oligomeric dichloride. This, in turn, was treated with triethanolamine to form 13-crown-4 derivatives that ...