pseudoracemicadj.
/ˌs(j)uːdəʊrəˈsiːmɪk/, U.S. /ˈˌsudoʊˌreɪˈsimɪk/, /ˈˌsudoʊrəˈsimɪk/ Chemistry.
Consisting of mixed or intergrown crystals of different optical isomers.
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the world > matter > chemistry > isomerism > [adjective] > of or relating to stereo-isomerism > of or relating to optical isomerism > pseudoracemic
pseudoracemic1897
1897 F. S. Kipping & W. J. Pope in Jrnl. Chem. Soc. 71 991 Whilst retaining the name racemic compound for a substance belonging to class (a), we propose..to call those belonging to class (b) pseudoracemic, in order to distinguish them from mere mixtures of the two antipodes on the one hand, and from racemic compounds on the other.
1951 S. Coffey tr. J. P. Wibaut Org. Chem. viii. 218 Cases are also known in which mixed crystals of the optical antipodes separate (pseudo-racemic mixed crystals).
1991 Biol. Mass Spectrometry 20 559 A male extensive metabolizer of mephenytoin who was given a pseudoracemic oral dose of hexobarbital.
Derivatives
pseudoˈracemate n. a pseudoracemic substance.
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the world > matter > chemistry > isomerism > [noun] > stereo-isomerism > optical isomerism > racemism > pseudoracemate
pseudoracemate1926
1926 Jrnl. Chem. Soc. ii. 2779 Whether he is dealing with a racemate or a pseudo-racemate.
1973 S. F. Mason in F. Ciardelli & P. Salvadori Fund. Aspects & Rec. Devel. Optical Rotatory Dispersion & Circular Dichroism iii. 212 A pseudoracemate of lel and ob diastereoisomers is not optically inactive.
2000 Jrnl. Amer. Chem. Soc. 122 2549/1 The pseudoracemate is less soluble than the enantiomeric structures of the pure compounds.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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adj.1897