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cis-trans isomerism
(redirected from Trans isomer)

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cis-trans isomerism [′si¦stranz ī′säm·ə‚riz·əm]
(organic chemistry)
A type of geometrical isomerism found in alkenic systems in which it is possible for each of the doubly bonded carbons to carry two different atoms or groups; two similar atoms or groups may be on the same side (cis) or on opposite sides (trans) of a plane bisecting the alkenic carbons and perpendicular to the plane of the alkenic system.
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Maleic acid (cis-2-butene-l, 4-dioic acid), and its corresponding methyl ester (DMME) in which the alkene double bond is in conjugation with carboxyl group, is known to undergo isomerization on treatment with aqueous bromine or Br2/CC14 under UV light to form the thermodynamically more stable trans isomer.
Chemistry (Alabama Undergraduate Research Symposium) posters abstracts by Journal of the Alabama Academy of Science
Some say only the trans isomer is biologically active and the cis does nothing; some say both are important.
The laboratory notebook: answering important questions about quality by Green, Robert / Nutraceuticals World
Kaneka--one of the few CoQ10 brands promoted to the supplement industry--provides the trans isomer, whereas many synthetic products on the market today contain the unproven cis CoQ10.
The fall and rise of Coenzyme Q10 by Day, Claire / Nutraceutical Business & Technology
 
 
 
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