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negative substituent

См. также в других словарях:

  • Hammett equation — ; 1935; 17(1); 125 136 [http://pubs.acs.org/cgi bin/abstract.cgi/chreay/1935/17/i01/f pdf/f cr60056a010.pdf Abstract] ] .The basic idea is that for any two reactions with two aromatic reactants only differing in the type of substituent the change …   Wikipedia

  • Acid dissociation constant — Acetic acid, a weak acid, donates a proton (hydrogen ion, high …   Wikipedia

  • Discovery and development of dual serotonin and norepinephrine reuptake inhibitors — Serotonin–norepinephrine reuptake inhibitors (SNRIs) are a class of antidepressant drugs used in the treatment of major depressive disorder (MDD). SNRIs are potent inhibitors of serotonin (5 Hydroxytryptamine, 5 HT) and norepinephrine (NE,… …   Wikipedia

  • Diels-Alder reaction — The Diels Alder reaction is an organic chemical reaction (specifically, a cycloaddition) between a conjugated diene and a substituted alkene, commonly termed the dienophile, to form a substituted cyclohexene system. [cite journal author = Diels,… …   Wikipedia

  • lipid — /lip id, luy pid/, n. Biochem. any of a group of organic compounds that are greasy to the touch, insoluble in water, and soluble in alcohol and ether: lipids comprise the fats and other esters with analogous properties and constitute, with… …   Universalium

  • reaction mechanism — Introduction       in chemical reactions (chemical reaction), the detailed processes by which chemical substances are transformed into other substances. The reactions themselves may involve the interactions of atoms (atom), molecules (molecule),… …   Universalium

  • Functional group — For other uses, see Functional group (disambiguation) and Moiety (disambiguation). Benzyl acetate has an ester functional group (in red), an acetyl moiety (circled with green) and a benzyloxy moiety (circled with orange). Other divisions can be… …   Wikipedia

  • chemical compound — Introduction  any substance composed of identical molecules consisting of atoms (atom) of two or more chemical elements (chemical element).       All the matter in the universe is composed of the atoms of more than 100 different chemical elements …   Universalium

  • organometallic compound — ▪ chemical compound Introduction  any member of a class of substances containing at least one metal to carbon bond in which the carbon is part of an organic group. Organometallic compounds constitute a very large group of substances that have… …   Universalium

  • (+)-CPCA — Systematic (IUPAC) name methyl (3R,4S) 4 (4 chlorophenyl) 1 methylpiperidine 3 carboxylate Clinical data Pregnancy cat …   Wikipedia

  • Histoire de l'homme occidental — L’histoire de l’homme occidental est l’étude des faits qui concernent l’identité culturelle de l’homme occidental à travers son histoire. Elle évacue toute composante événementielle dans le but d’illustrer comment ce dernier a évolué dans ses… …   Wikipédia en Français

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