Maleic anhydride kuj yog ib qho zoo heev dienophile, vim cov electron rho tawm ntawm carbonyl pawg ua rau ob alkene carbons ua electron-tsis zoo, thiab yog li lub hom phiaj zoo. rau kev tawm tsam los ntawm pi electrons hauv diene. … alkyl pawg) thiab pawg electron rho tawm ntawm dienophile.
Vim li cas txiv neej anhydride yuav yog dienophile zoo dua li ethylene?
Piav vim li cas txiv neej anhydride yog ib qho zoo dua dienophile ntau dua li ethylene. Cov pab pawg tshem tawm electron ntawm maleic anhydride ua rau nws muaj zog ntau dua vim yog electron-deficient. … Ob leeg ntawm cov hloov pauv yog electron rho tawm, yog li lawv tshem tawm ib leeg.
Vim li cas txiv neej anhydride yog reactive dienophile hauv Diels-Alder cov tshuaj tiv thaiv?
Raws li kev ua kom muaj zog, ceeb toom tias txiv neej anhydride yog ib qho reactive dienophile, vim muaj ob lub electron- thim carbonyl substituents. Anthracene, txawm li cas los xij, yog ib qho tsis zoo uas tsis muaj tshuaj tiv thaiv. … Qhov stabilization nyob rau hauv cov reactant txo cov reactivity (stability/reactivity txoj cai).
Dienophile zoo yog dab tsi?
Ib tug zoo dienophile feem ntau muaj ib pab pawg tshem tawm hluav taws xob (EWG) txuas rau ib lossis ob qho tib si alkene carbons. EWGs zoo suav nrog ketone, aldehyde, nitrile, nitro, thiab trifluoromethyl pawg. Maleic anhydride yog ib qho zoo heev dienophile.
Nws yog qhov zoo tshaj plaws dienophile rau ib txwm Diels-Aldertshuaj tiv thaiv?
Cov tshuaj Diels-Alder ib txwm ua tau zoo tshaj plaws thaum diene yog electron-nplua nujthiab dienophile electron-neeg pluag. Txawm li cas los xij, hauv qee kis, qhov sib txawv polarity yog ua tau, thiab cov tshuaj tiv thaiv no hu ua inverse electron-xav tau Diels-Alder cov tshuaj tiv thaiv.
