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organic compounds
The crystal structures of three sterically fixed biphenyls, 2,2'-biphenylbis(1-cyclohexanol), C24H30O2, (I), 2,2;7,7-bis(pentamethylene)dibenzo[c,e]dihydrooxepin {alternative name 2',7'-dihydrodispiro[cyclohexane-1,2'-dibenzo[c,e]oxepine-7',1"-cyclohexane]}, C24H28O, (II), and 3b,4,5,6,7,7a,10b,11,12,13,14,14a-dodecahydrodibenzo[e,l]pyrene, C24H26, (III), are described. Results are compared with those from a conformational analysis performed using the molecular modelling program MOMO.