Yk. Chen et Yy. Chen, Synthesis of doubly bridged p-tert-butyl-calix[6] arene containing hard and soft ion binding sites, TETRAHEDR L, 41(47), 2000, pp. 9079-9082
A conformationally preorganized, C-s-symmetrical p-tert-butyl-calix[6]-1,4-
crown-4-2,6-dioxo-diazacrown-4 with hard and soft ion binding sites at the
lower rim is synthesized. The binding sites may complex alkali metal ions o
r transition metal ions selectively. (C) 2000 Elsevier Science Ltd. All rig
hts reserved.