Video: PKa ntawm imidazole yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Imidazole . pKa : 6.9, 14.4, 33.7.
Ua kom qhov no saib, puas yog imidazole acidic lossis yooj yim?
Cov qauv thiab cov khoom Imidazole yog amphoteric. Ntawd yog, nws tuaj yeem ua haujlwm zoo li ob qho tib si kua qaub thiab as a puag . Raws li ib qho kua qaub , pK uaa ntawm imidazole yog 14.5, ua rau nws tsawg dua acidic tshaj carboxylic acids, phenols, thiab imides, tab sis me ntsis ntxiv acidic tshaj cawv. Cov acidic proton yog ib qho khi rau nitrogen.
Tom qab ntawd, lo lus nug yog, vim li cas imidazole amphoteric? Imidazole yog amphoteric ; uas yog, nws tuaj yeem ua haujlwm raws li cov kua qaub thiab lub hauv paus. Cov sib xyaw tau muab cais ua cov ntxhiab tsw vim muaj cov sextet ntawm π-electrons, suav nrog ib khub ntawm cov hluav taws xob los ntawm cov tshuaj nitrogen atom protonated thiab ib qho los ntawm txhua ntawm plaub lub atoms ntawm lub nplhaib.
Ib yam li ntawd, lub nplhaib imidazole yog dab tsi?
Imidazole yog heterocyclic aromatic organic compound. Nws tau raug cais ntxiv raws li alkaloid. Ntau cov tshuaj muaj cov imidazole nplhaib , xws li tshuaj tua kab mob thiab nitroimidazole. Imidazole yog 5 daim phiaj sib koom ua ke nplhaib uas yog soluble nyob rau hauv dej thiab polar solvents. Imidazole yog lub hauv paus thiab zoo heev nucleophile.
Cov nitrogen twg hauv imidazole yog qhov yooj yim dua?
Imidazole yog lub nplhaib uas muaj ntxhiab nyob hauv ntau yam tshuaj lom neeg lom. Ib ntawm nws nitrogen atoms zoo li pyrrole, thiab tsis yog yooj yim . Qhov thib ob nitrogen atom, uas yog cov qauv zoo ib yam li nitrogen atom ntawm pyridine, ua raws li lub hauv paus. Txawm li cas los xij, imidazole yog li 100 zaus yooj yim dua tshaj li pyridine.
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