Ds. Black et al., MOLECULAR-STRUCTURE OF A MACROCYCLIC BISPIDINONE -1,13-DIAZATRICYCLO[11.3.3.1(15,18)]EICOSAN-20-ONE, Chemical communications, (17), 1996, pp. 2093-2094
A crystal structure of the macrocyclic bispidinone 6 reveals a chair-b
oat conformation and a variable temperature H-1 NMR study demonstrates
that in solution this configuration is in a degenerate equilibrium.