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The crystal structures of three  N -(arenecarbonyl)- N , N ′-dicyclohexylureas, [ 1 : ArCO-N(cyclohexyl)-CO-NH-cyclohexyl: (R = Ph ( 1a ), pyridin-3-yl ( 1c ) and pyrazinyl ( 1e )] are reported from data collected at 120K. Comparison of the new findings with published data for the three compounds indicates three forms have been recognized for this group of compounds: an  orthorhombic -form [P2 1 2 1 2 1 ] and two  triclinic  [ P -1] forms –  triclinic - I  and  triclinic - II .  Orthorhombic  and  triclinic - II  phases have been determined for compound,  1a ,  triclinic - I  and  triclinic - II  forms for compound  1c , and just the  orthorhombic  form for compound,  1e . O rthorhombic  1a  and  1e  are isostructural, as are  triclinic - II  1a  and  1c . The asymmetric unit for the  orthorhombic  form contains just a single molecule, while the molecules are linked into chains,  C(7)R 2  2 (11) ,  via  strong N—H ··· O   and weaker C—H ··· O intermolecular hydrogen bonds. The asymmetric unit for  triclinic - I  consists of two independent molecules, molecules A and B, which are linked alternatively into chains,  C(8)R 2  2 (16) ,  via  N—H ··· N and C—H ··· O intermolecular hydrogen bonds in the direction of the   a   axis: such chains are linked  via  C—H ··· O hydrogen bonds. The asymmetric unit of the  triclinic - II    phase also comprises two independent molecules, molecules A and B, which are also linked alternatively into chains,  C(8) , but only  via  N—H ··· O hydrogen bonds, with other intermolecular interactions of the C—H ··· π type also present.

Structures of N -(arenecarbonyl)- N , N ′-dicyclohexylureas, cyclohexyl-NH—C(O)—N(cyclohexyl)—C(O)Ar, (Ar = Ph, pyridin-3-yl and pyrazinyl)