SEARCH Articles Figures Tables A Selection of Cyclic Hydrogen-Bonding Patterns Formed in Nucleoside and Nucleotide Crystal Structures Bond-selectivity Bonds selection Carbon-hydrogen bonds allylic, selective bromination Double bond, exocyclic, selective hydrogenation Hydrogen bonding solvent selectivity effects Hydrogen bonds facial selectivity Hydrogenation selectivity Selective Hydrogenation of Isolated Double Bonds Selective hydrogenation Solvent selectivity hydrogen-bonding systems