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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The signals originating from C[H.sub.3] at position 4 of the diastereoisomeric isoxazoles of 4 presented a difference of 2 ppm, a singlet signal at 10.8 ppm was assigned to 4a, and a quartet signal at 12.8 ppm with [J.sub.CF] 2.9 Hz was compatible with 4b; therefore, this coupling between the methyl and the trifluoromethyl groups through space indicates the cis relationship [11].
Because of the four chiral carbons present in its structure, TBECH can exist in four diastereoisomeric forms ([alpha], [beta] [gamma], and [delta]).
The mixture was evaporated, and the obtained oily residue was crystallized from ethyl acetate-hexane to yield 75 mg of the hydrogen chloride salt of MDMPA (diastereoisomeric mixture).
The isolated components were identified as four diastereoisomeric pairs of 9, 12, 13-trihydroxy-trans- 10, cis-15-octadecadienoic acid; 12, 15, 16-trihydroxy-cis-9, trans-13-octa-decadienoic acid; 9, 10, 13-trihydroxy-trans-11, cis-15-octadeca-dienoic acid; and 12, 13, 16-trihydroxy-cis-9, trans-14-octadeca- dienoic acid.
An example of reduced sample preparation is described in work by Altria and Rogan.(15) In this example the two diastereoisomeric forms of the antibiotic cefuroxime axetil ester are separated from their major hydrolysis product (cefuroxime).