... Abstract. Chromogenic lariat ethers have been prepared which show improved extraction of alkali metals compared to their benzo analogues. Download full text in PDF. Tetrahedron Letters,Vol.25,No.l1,pp 1107110,1984 0040-4039/84 $3.00 + .00 Prihted in Great Britain 984 Pergamon Press Ltd. ... Chem. Soc., 1976, 98, 7620. 5. Bubnis, BP; Steger, JL; Wu, YP; Meyers, LA; and Pacey, GE Anal. Chim. Acta, 1982, 139, 307. ...