Y. Hosokawa et al., 8,16,24,32,40,48-Hexamethoxy[2.(6)]metacyclophane-1,9,17,25,33,41-hexayne:a novel near-planar ammonium-selective ionophore, CHEM COMMUN, (19), 2001, pp. 1948-1949
The titled cyclophane (cyclic [6]metaphenylacetylene) with six methoxy grou
ps inside the cavity has a nearly planar carbon framework, forms open-chann
el structures in the crystal, and exhibits an ammonium-selective ionophoric
property in spite of the considerably large cavity.