diastereoisomer


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diastereoisomer

[¦dī·ə‚ster·ē·ō′ī·sə· mər]
(organic chemistry)
One of a pair of optical isomers which are not mirror images of each other. Also known as diastereomer.
References in periodicals archive ?
It is noteworthy that the majority diastereoisomer formed was the same in the case of the reaction catalyzed by TEBAC.
Importantly, until recently SAM-e's benefit was virtually unknown, due to it is extreme instability at temperatures above 0[degrees] C, or in the presence of moisture, "both as degradation of the active ingredient intended as the sum of the two diastereoisomers, and as transformation of active (SS)-(+)-S-adenosyl-L-methionine into inactivate (RS)-(+)-S-adenosyl-L-methionine (racemisation of the substance).
The Diels-Alder addition of PTAD to the exocyclic diene in 25OHD produced a pair of diastereoisomers (Fig.
1]H NMR analysis indicated that the structure of the distinctive diastereoisomers obtained for 5 and 6 were trans-configured with respect to the 3-CH3/4-Ar substituents (Figure 2).
Silybin makes up more than 50% of silymarin and is made up of a mixture of two diastereoisomers, silybin A and silybin B.
Determination of hexabromocyclododecane diastereoisomers in Sargassum fusiforme and comparison of the extraction efficiency of ultrasonication, microwave-assisted extraction, Soxhlet extraction and pressurised liquid extraction," Journal of Separation Science, vol.
catechu; these are diastereoisomers of the 5,7,3',4'-tetrahydroxyflavan-3-ol structure (Figs.
Silymarin consists of at least seven flavonolignans, of which the most prevalent are the diastereoisomers silybin A and silybin B; silibinin consists only of silybin A and silybin B.
We were not able to separate the isomers present in the pheromone volatiles collected from females or synthetic stereoisomers with 2 different chiral columns because the enantiomers of branched aliphatic hydrocarbons do not possess a functional group that permits derivatized into diastereoisomers that could be separated by chromatographic methods or by spectroscopic techniques such as Nuclear Magnetic Resonance (Meierhenrich et al.
The hydroboration of 7a (diastereomeric mixture) resulted in 6- and 7-hydroxy methylacetals 8a and 9a, as a sum of 8 regio- and diastereoisomers (ratio of 8a and 9a was 4 : 1), and also 4% of the corresponding 6(S)-hydroxylactol 10.
However, this enzyme, termed organophosphorus acid anhydrolase (OPAA), hydrolyzes the relatively non-toxic pair of diastereoisomers, C([not equal to])P(+), more rapidly than the toxic pair C([+ or -])P(-) (1).