STRUCTURE OF SOME ADAMANTYL-CONTAINING UREAS AND HYDROGEN BONDS IN THEIR CRYSTALS

Abstract Molecular and crystal structures of five substituted urea derivatives with bulky adamantyl fragments in their substituents are considered. It is shown that the crystals of these compounds are formed by a system of intermolecular hydrogen bonds. The molecules without proton-donor groups in the lateral substituents form a linear system of N–H⋯O hydrogen bonds involving only the amide functional group, while the urea molecules containing proton-donor groups or the crystal solvates with proton-donor solvate molecules exhibit more complex motifs of hydrogen bonds.