Term in organic chemistry used to describe degree of substitution of an atom in a molecule
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This article is about general bonding patterns. For local three-dimensional motifs of proteins and nucleic acids, see secondary structure.
Secondary is a term used in organic chemistry to classify various types of compounds (e. g. alcohols, alkyl halides, amines) or reactive intermediates (e. g. alkyl radicals, carbocations).
Red highlighted central atoms in various groups of chemical compounds.