Stereocenter
Atom which is the focus of stereoisomerism in a molecule / From Wikipedia, the free encyclopedia
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In stereochemistry, a stereocenter of a molecule is an atom (center), axis or plane that is the focus of stereoisomerism; that is, when having at least three different groups bound to the stereocenter, interchanging any two different groups creates a new stereoisomer.[1][2] Stereocenters are also referred to as stereogenic centers.
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A stereocenter is geometrically defined as a point (location) in a molecule; a stereocenter is usually but not always a specific atom, often carbon.[2][3] Stereocenters can exist on chiral or achiral molecules; stereocenters can contain single bonds or double bonds.[1] The number of hypothetical stereoisomers can be predicted by using 2n, with n being the number of tetrahedral stereocenters; however, exceptions such as meso compounds can reduce the prediction to below the expected 2n.[4]
Chirality centers are a type of stereocenter with four different substituent groups; chirality centers are a specific subset of stereocenters because they can only have sp3 hybridization, meaning that they can only have single bonds.[5]