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para-substituents

См. также в других словарях:

  • para- — 1. Prefix denoting a departure from the normal. 2. Prefix denoting involvement of two like parts or a pair. 3. Prefix denoting adjacent, alongside, near, etc. 4. (p ) In chemistry, an italicized prefix denoting two substitutions in the benzene… …   Medical dictionary

  • para- — I. 1. a prefix meaning beside , near , beyond , aside , amiss , and sometimes implying alteration or modification, occurring originally in words from the Greek, but used also as a modern formative, chiefly in scientific words. 2. a prefix meaning …  

  • 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

  • Arene substitution patterns — are part of organic chemistry IUPAC nomenclature and pinpoint the position of substituents other than hydrogen in relation to each other on an aromatic hydrocarbon. Contents 1 Ortho, meta, and para substitution 2 Ipso, meso, and peri substitution …   Wikipedia

  • Diels–Alder reaction — Named after Otto Paul Hermann Diels Kurt Alder Reaction type Cycloaddition Reaction …   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

  • Electrophilic aromatic substitution — or EAS is an organic reaction in which an atom, usually hydrogen, appended to an aromatic system is replaced by an electrophile. The most important reactions of this type that take place are aromatic nitration, aromatic halogenation, aromatic… …   Wikipedia

  • hydrocarbon — hydrocarbonaceous, adj. /huy dreuh kahr beuhn, huy dreuh kahr /, n. any of a class of compounds containing only hydrogen and carbon, as an alkane, methane, CH4, an alkene, ethylene, C2H4, an alkyne, acetylene, C2H2, or an aromatic compound,… …   Universalium

  • Dakin oxidation — The Dakin oxidation The Dakin oxidation is an organic redox reaction in which an ortho or para hydroxylated phenyl aldehyde (2 hydroxybenzaldehyde or 4 hydroxybenzaldehyde) or ketone reacts with hydrogen pero …   Wikipedia

  • Baker-Nathan effect — The Baker Nathan effect in organic chemistry is an effect observed with reaction rates for certain chemical reactions with certain substrates where the order in reactivity cannot be explained solely by an inductive effect of substituents.… …   Wikipedia

  • IUPAC nomenclature of organic chemistry — The IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended[1] by the International Union of Pure and Applied Chemistry (IUPAC). Ideally, every possible organic compound should have a… …   Wikipedia

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