achiral: A molecule that’s superimposable on its mirror image. Achiral molecules do not rotate plane-polarized light.
acid: A proton donor or an electron pair acceptor.
alcohol: A molecule containing a hydroxyl (OH) group. Also a functional group.
aldehyde: A molecule containing a terminal carbonyl (CHO) group. Also a functional group.
alkane: A molecule containing only C-H and C-C single bonds.
alkene: A molecule containing one or more carbon-carbon double bonds. Also a functional group.
alkyne: A molecule containing one or more carbon-carbon triple bonds. Also a functional group.
allylic carbon: An sp3 carbon adjacent to a double bond.
amide: A molecule containing a carbonyl group attached to a nitrogen (–CONR2). Also a functional group.
amine: A molecule containing an isolated nitrogen (NR3). Also a functional group.
anion: A negatively charged atom or molecule.
anti addition: A reaction in which the two groups of a reagent X-Y add on opposite faces of a carbon-carbon bond.
anti conformation: A type of staggered conformation in which the two big groups are opposite of each other in a Newman projection (see Figure C-1).
anti-aromatic: A highly unstable planar ring system with 4n: π electrons.
anti-periplanar (also known as anticoplanar): The conformation in which a hydrogen and a leaving group are ...