hyperconjugation

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hyperconjugation [‚hī·pər‚kän·jə′gā·shən]

(physical chemistry)

An arrangement of bonds in a molecule that is similar to conjugation in its formulation and manifestations, but the effects are weaker; it occurs when a CH₂or CH₃group (or in general, an AR₂or AR₃group where A may be any polyvalent atom and R any atom or radical) is adjacent to a multiple bond or to a group containing an atom with a lone π-electron, π-electron pair or quartet, or π-electron vacancy; it can be sacrificial (relatively weak) or isovalent (stronger).

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No references found			It was found that the mesomeric and the hyperconjugation effects have a strong influence on the antibacterial activity. Synthesis and antibacterial activity of crossed aldol products by Hania, Majed M.; Abo-Sharkia, Tarik / International Journal of Applied Chemistry Then, Pophristic looked at the other known influence on ethane's twisting--a quantum mechanical effect known as hyperconjugation. Molecular Chemistry Takes a New Twist by Gorman, J. / Science News			hyperboloid of two sheets Hyperboloids Hyperborean Platform Hyperboreans hyperbrachycephalic hyperbrachycranial hyperbrachyskelic hypercalcemia hypercapnia Hypercar HyperCard hyperchamaerrhine hypercharge hyperchlorhydria hypercholesteremia hyperchromatic hyperchromatism hyperchromic hyperchromic anemia hyperchromicity hypercircle method hypercoagulability hypercomplex number Hypercomplex Numbers hypercomplex system hyperconjugation hypercoracoid hypercorticism hypercube hyperdisk hyperdolichocephalic hyperdolichocranial hyperdynamic ileus hyperemesis hyperemesis gravedorium Hyperemia hyperergia hyperesthesia hypereuryene hypereutectic alloy hypereutectoid steel hyperfine enhanced nuclear cooling Hyperfine Structure hyperfocal distance hyperforming hyperfrequency waves Hyperfunction hypergammaglobulinemia hypergene hypergeometric differential equation hypergeometric distribution			Hyperchromic shift Hyperchromicity hyperchylia Hyperchylomicronaemia Hyperchylomicronaemia hyperchylomicronemia hyperchylomicronemia hypercircle method Hypercium Hypercium Hypercium perforatum Hypercium perforatum Hypercoagulability Hypercoagulability Hypercoagulability hypercoagulable Hypercoagulable state Hypercoagulable state Hypercoagulation Disorders hypercoaster Hypercoaster roller coaster Hypercoasters hypercolumn Hypercommercialism Hypercompact Stellar System Hypercomplex number Hypercomplex numbers hypercomplex system Hypercone Hyperconjugated hyperconjugation hyperconscious hypercontracted sarcomeres hypercoracoid hypercorrect hypercorrection hypercorrection Hypercorrections hypercorrectly hypercorrectness hypercorticism hypercorticism hypercortisolism hypercortisolism hypercortisolism hypercritic hypercritical hypercritical Hypercritical school hypercritically hypercritically Hypercriticise hypercriticism hypercriticism hypercryalgesia hypercryalgesia, hypercryesthesia hypercryesthesia Hypercube Hypercube Hypercube Adaptive Diagnosis Algorithm Hypercube Connected Network

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