Figure 1
A view of (I), showing part of the atom-labelling scheme. The calixarene numbering scheme starts at the ipso C atom, goes around the C6 ring, then the tBu group and finally the bridging CH2 unit. Displacement ellipsoids are drawn at the 30% probability level. Only those H atoms involved in hydrogen bonding (indicated by dashed lines) are shown. [Symmetry code: (i) −x, −y + 1, −z + 1.] |