Completing a Molecular LEGO Set

The melting points of the 1 1 adduct 40 and the 2 1 adduct 41 exceed 300 °C and their molecular ions appear at m/z 356 and 502, respectively in the electron impact mass spectrum (EIMS). Confirmation of the overall Cs molecular symmetry possessed by structure 40 was provided by the observation of (i) 11 resonances, 

The macropolycycle 43 possesses a crystallographic center of symmetry. Consequently, the two aromatic residues are parallel with an interplanar separation between them of 7.9 A. Examination of the unit cell provides an explanation for the high instability of the crystals. The macropolycyclic rings are arranged in parallel edge-to-face layers with 12 disordered chloroform molecules sandwiched 

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