leaving group


Also found in: Wikipedia.

leaving group

[′lēv·iŋ ‚grüp]
(organic chemistry)
The group of charged or uncharged atoms that departs during a substitution or displacement reaction. Also known as nucleofuge.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
He usually doesn't like leaving group chats because he doesn't want to be seen as rude. 
Both nations created chances at Soccer City, including two in the first five minutes, but failed to convert them, leaving Group A blank after 180 minutes.
Adhesion to metals is also increased with acetoxy adhesives due to etching from the acidic leaving group. This creates strong adhesion between silicone and the substrate, yet (1) acetic acid can corrode electronics and (2) the leaving group causes mass loss and shrinkage.
Rachel Yankey doubled the tally midway through the second half, leaving group B runners-up Japan looking thoroughly outclassed.
These markets saw likefor-like sales drop 8.8%, leaving group sales down 4%, despite resilient trading in France.
These markets saw like-for-like sales drop 8.8%, leaving group sales down 4% - despite more resilient trading at Darty France.
(Maastricht, Netherlands) has patented a process for the assessment of an active proteolytic enzyme in blood or other biological fluid sample possibly comprising a complex of said proteolytic enzyme and .alpha..sub.2 -macroglobulin, wherein said sample is contacted with a substrate comprising a molecule of sufficient size coupled to a signal-substrate, said signal-substrate comprising a detectable leaving group, wherein said substrate is hydrolysed by said proteolytic enzyme but not by said complex.
I think the Michaelis complex for the capping reactions are phosphates sandwiched between calciums, derived from the site for the original leaving group, pyrophosphate.
Key statement: A method for preparing a functional polymer, the method comprising: terminating a living polymer chain with a functionalizing agent where the functionalizing agent is defined by the formula [pi]-[R.sub.1]-[alpha] where [pi] is a leaving group or an addition group, [R.sub.1] is a bond or a divalent organic group, and a is a sulfur-containing heterocycle selected from the group consisting of thiirane, thietane, thiolane, thiazoline, dihydrothiophene, thiadiazine, thioxanthene, thianthrene, phenoxathiin, dihydroisothiazole, and thienofuran group or substituted form thereof.
The assay compound includes a leaving group and an indicator group.
But the pains outweighed the gains leaving group profits for the six months to October pounds 4.7 million lower at pounds 11.4 million.
Due to large demands on their service, Air Products couldn't respond quickly with respiratory agents, leaving groups of vulnerable people very distressed.