Deactivator (deactivating pawg): Hauv electrophilic aromatic hloov pauv, ib lub nplhaib aromatic hloov pauv uas txo qis nucleophilicity thiab arenium ion arenium ion Illustrated Glossary of Organic Chemistry - Arenium ion. Arenium ion: Ib qho carbocation tsim los ntawm electrophilic nres ntawm lub nplhaib uas muaj ntxhiab. Ib qho reactive intermediate hauv electrophilic aromatic hloov. Tsim ib qho arenium ion los ntawm electrophilic nres ntawm benzene. https://www.chem.ucla.edu › harding › IGOC › arenium_ion
Illustrated Glossary of Organic Chemistry - Arenium ion
stability (kwv yees rau hydrogen atom), yog li ua rau cov tshuaj tiv thaiv qeeb dua li qub cov tshuaj tiv thaiv ntawm benzene nws tus kheej.
Dab tsi yog activator thiab deactivator?
Feem ntau hais lus, electron donators / activators muaj ib leeg ib khub ntawm electrons lossis ib qho electron ntom uas "pushes" rau hauv benzene. Cov hluav taws xob rho tawm / deactivators muaj cov nqi zoo ntawm cov khoom siv los yog cov khoom siv hluav taws xob uas txuas nrog rau nws, uas "rub" electrons tawm ntawm benzene.
txhais tau tias yog meta directing?
Meta tus thawj coj: Hauv electrophilic aromatic hloov pauv, ib qho khoom siv uas nyiam electrophilic nres meta rau cov hloov pauv. Feem ntau cov thawj coj meta kuj tseem yog tus neeg tsis ua haujlwm.
meta directing deactivator yog dab tsi?
Deactivators yog meta-directing vim qhov kev tso kawm ntawm + nqi nyob rau hauv resonance daim ntawv ntawm lub sigmacomplex. Txoj haujlwm meta yuav ruaj khov dua vim tias muaj ob + nqi ib sab ntawm ib leeg yog qhov tsis ruaj khov, raws li pom hauv cov ntawv resonance rau ortho thiab para txoj haujlwm.
Vim li cas meta directing pab pawg deactivator?
Halogens yog electronegative heev. Qhov no txhais tau tias inductively lawv yog electron rho tawm. Txawm li cas los xij, vim lawv muaj peev xwm pub dawb ib khub ntawm electrons hauv cov ntawv resonance, lawv yog activators thiab ortho / para directing. … Cov pab pawg tshem tawm hluav taws xob yog cov thawj coj ntawm cov meta thiab lawv yog cov deactivators.
