pseudoasymmetryn.
/ˌs(j)uːdəʊeɪˈsɪmᵻtri/, U.S. /ˌsudoʊˌeɪˈsɪmətri/ Chemistry.
The property of an atom of being bonded to two enantiomorphic groups.
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pseudoasymmetry1907
1907 A. W. Stewart Stereochem. I. ii. i. 21 The carbon atom on which he [sc. the observer] was situated was not symmetrical, although it was joined to two structurally symmetrical groups. Such a case is named Pseudo-asymmetry.
1975 Nature 13 Nov. 96/3 Two detailed papers on compounds showing axes and planes of pseudo-asymmetry.
1995 Macromolecules 28 5968/1 The split of the signal around 4 ppm should be caused by the ‘pseudoasymmetry’ of the sulfur atom.
Derivatives
ˌpseudoasyˈmmetric adj.
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the world > matter > chemistry > chemical bonding > [adjective] > of or relating to isomeric bonding > of or relating to pseudo-asymmetry
pseudoasymmetric1907
1907 J. B. Cohen Org. Chem. Adv. Students I. ii. 94 The cyclic carbon atoms 2 and 4 are asymmetrical per se; 3 is symmetrical though structurally identical with 2 and 4. It follows..that 1 and 3 are pseudo-asymmetric.
1962 E. L. Eliel Stereochem. Carbon Compounds iii. 28 Such a pseudoasymmetric atom does not give rise to dissymmetry in the molecule as a whole.
1999 A. Rudin Elem. Polymer Sci. & Engin. (ed. 2) iv. 129 Each pseudoasymmetric carbon can exist in two distinguishable configurations.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1907