Video: Puas yog methoxy electron pub dawb lossis rho tawm?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov pa oxygen atom tiag tiag ua haujlwm hluav taws xob - thim tawm cov nyhuv inductive, tab sis ib leeg khub ntawm cov pa oxygen ua rau muaj qhov cuam tshuam qhov tseeb - lub methoxy group yog ib hluav taws xob - pub dawb pab pawg los ntawm resonance.
Ua kom pom qhov no, puas yog och3 electron pub dawb lossis rho tawm?
RESONANCE teebmeem yog cov uas tshwm sim los ntawm pi system thiab tuaj yeem sawv cev los ntawm cov qauv resonance. Cov no tuaj yeem yog electron pub dawb (p.g. - OCH3 ) where pib electrons raug thawb mus rau lub arene los yog electron rho tawm (e.g. -C=O) where pi electrons raug rub tawm ntawm lub arene.
Ib yam li ntawd, puas yog electron pub dawb lossis rho tawm? Ib hluav taws xob tso tawm pab pawg lossis ERG (tej zaum kuj hu ua electron pub dawb pawg lossis EDG's) tso tawm electrons mus rau hauv ib lub chaw tshuaj tiv thaiv thiab xws li stabilizes hluav taws xob tsis muaj carbocations. Ib electron rho tawm group or EWG draws electrons deb ntawm lub chaw tshuaj tiv thaiv.
Ib yam li ib tug yuav nug, vim li cas methoxy electrons pub dawb?
A methoxy Kev hloov pauv tau cuam tshuam rau lub nplhaib hluav taws xob ntawm ob qho kev sib tw. Yog li cov methoxy yog hluav taws xob - pub dawb los ntawm qhov kev xav ntawm resonance. Ntawm qhov tod tes, vim tias oxygen yog electronegative heev, lub pawg methoxy yog hluav taws xob - thim tawm hauv kev nkag siab inductive ntawm σ bonds.
Dab tsi cuam tshuam och3 qhia?
Nws yog ntau ntom rau qhov ntau electronegative ntawm ob atoms. Qhov no mus tas li lub xeev ntawm polarization yog hu ua inductive nyhuv . Raws li oxygen (hauv - OCH3 ) yog ntau electronegative tshaj carbon yog li nws yuav qhia -Kuv nyhuv uas yog electron rho tawm.
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