Qhov sib txawv tseem ceeb ntawm oxymercuration thiab demercuration yog tias oxymercuration koom nrog qhov sib ntxiv ntawm electrophilic qhov twg alkene hloov mus rau hauv cov cawv nruab nrab, qhov demercuration cuam tshuam kev hloov pauv ntawm alkene rau hauv Hg2+ ntsev thiab ib qho organomercury nruab nrab.
Oxymercuration yog tshuaj lom neeg cov tshuaj tiv thaiv nyob rau hauv uas ib qho electrophilic ntxiv mechanism tshwm sim, hloov cov alkene rau hauv nruab nrab cawv. Demercuration lossis oxymercuration-demercuration yog cov tshuaj tiv thaiv uas alkene hloov mus rau Hg2 + ntsev thiab oxygen nucleophile, tsim ib qho organomercury nruab nrab.
Oxymercuration yog dab tsi?
Oxymercuration yog tshuaj lom neeg cov tshuaj tiv thaiv nyob rau hauv uas ib qho electrophilic ntxiv mechanism tshwm sim, hloov cov alkene rau hauv nruab nrab cawv. Hauv cov txheej txheem no, peb tuaj yeem soj ntsuam cov tshuaj tiv thaiv ntawm alkene thiab mercuric acetate hauv cov tshuaj aqueous. Qhov no ua rau muaj qhov sib ntxiv ntawm pawg acetoxymercury thiab pab pawg OH hla ob daim ntawv cog lus.
Daim duab 01: Ib qho Oxymercuration Reaction Mechanism hauv Sequential Order
Thaum cov txheej txheem oxymercuration, carbocations tsis tsim. Yog li ntawd, muaj cov kauj ruam rov kho dua thiab. Cov tshuaj tiv thaiv no tshwm sim raws li Markonikov txoj cai, uas piav qhia tias thaum sib ntxiv ntawm protic acid nrog cov qauv ntawm HX (qhov twg X=halogen) los yog H 2 O (siv raws li H-OH) rau ib qho alkene, hydrogen txuas mus rau ob-bonded carbon nrog ntau dua hydrogen atoms, thaum lub halogen (X) txuas rau lwm cov pa roj carbon.
Ntxiv mus, oxymercuration yog ib qho tshuaj tiv thaiv ntxiv. Qhov no txhais tau hais tias pawg OH yuav ib txwm tau ntxiv rau cov pa roj carbon atom uas hloov pauv ntau dua thiab ob pawg yuav hloov mus rau ib leeg, raws li.
Daim duab 02: Ib Daim Ntawv Thov ntawm Oxymercuration
Feem ntau, cov tshuaj tiv thaiv oxymercuration yog ua raws li cov tshuaj tiv thaiv demercuration txo; li no peb hu nws ua oxymercuration-txo cov tshuaj tiv thaiv. Xyaum, qhov kev txo qis no ntau dua li cov tshuaj tiv thaiv oxymercuration.
Dab tsi yog Demercuration?
Demercuration lossis oxymercuration-demercuration yog cov tshuaj tiv thaiv uas alkene hloov mus rau Hg2 + ntsev thiab oxygen nucleophile, tsim ib qho organomercury nruab nrab. Cov pa oxygen nucleophile peb siv ntawm no tuaj yeem yog dej lossis cawv. Nyob rau hauv lwm yam lus, nyob rau hauv demercuration, ib tug hydrogen atom ntawm CH2 site thiab ib pawg hydroxyl ntawm lub nplhaib carbon atom react nrog ib leeg. Nws muab cov khoom kwv yees Markovnikov los ntawm kev tsis ncaj qha dej ntawm alkene.
Qhov txawv ntawm Oxymercuration thiab Demercuration yog dab tsi?
Oxymercuration yog tshuaj lom neeg cov tshuaj tiv thaiv nyob rau hauv uas ib qho electrophilic ntxiv mechanism tshwm sim, hloov cov alkene rau hauv nruab nrab cawv. Demercuration, ntawm qhov tod tes, yog cov tshuaj tiv thaiv uas alkene hloov mus rau Hg2 + ntsev thiab oxygen nucleophile, tsim ib qho organomercury nruab nrab. Yog li ntawd, qhov sib txawv tseem ceeb ntawm oxymercuration thiab demercuration yog tias oxymercuration koom nrog qhov sib ntxiv ntawm electrophilic qhov twg alkene hloov mus rau hauv cov cawv nruab nrab, thaum demercuration cuam tshuam nrog kev hloov pauv ntawm alkene rau hauv Hg2 + ntsev thiab ib qho organomercury nruab nrab.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm oxymercuration thiab demercuration hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Oxymercuration vs Demercuration
Oxymercuration yog tshuaj lom neeg cov tshuaj tiv thaiv nyob rau hauv uas ib qho electrophilic ntxiv mechanism tshwm sim, hloov cov alkene rau hauv nruab nrab cawv. Demercuration los yog oxymercuration-demercuration yog cov tshuaj tiv thaiv uas alkene hloov mus rau Hg2 + ntsev thiab oxygen nucleophile, tsim cov organomercury nruab nrab. Yog li, qhov sib txawv tseem ceeb ntawm oxymercuration thiab demercuration yog tias oxymercuration koom nrog qhov sib ntxiv ntawm electrophilic qhov twg alkene hloov mus rau hauv nruab nrab cawv, thaum demercuration koom nrog kev hloov pauv ntawm alkene rau hauv Hg2 + ntsev thiab ib qho organomercury nruab nrab.
