Video: Puas yog Diels Alder nyiam Endo lossis Exo?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov Diels - Alder tshuaj tiv thaiv yog ib tug reversible tshuaj. Th formation ntawm exo ua vs endo yog ib rooj plaub ntawm kinetic vs. thermodynamic tswj. Cov exo ua khoom yog ruaj khov dua, tab sis lub zog ua kom muaj zog rau endo yog qis dua, yog li qhov tsawg ruaj khov endo khoom yog tsim sai dua.
Tom qab ntawd, Endo lossis Exo puas nyiam?
1. Endo Cov khoom lag luam yuav Nyiam Nyob rau hauv Diels-Alder Txawm hais tias lawv muaj kev cuam tshuam ntau dua. [Yuav tsum dhia ua ntej, ntawm no yog qhov tseeb peb mam li nthuav dav ntxiv hauv cov ntawv tom ntej: feem ntau exo ua cov khoom nyob rau hauv qhov tseeb ntau ruaj khov tshaj li endo cov khoom rau steric yog vim li cas, tab sis cov endo cov khoom zoo li yuav tsim sai dua.
Ib yam li ntawd, puas yog endo thiab exo cov khoom enantiomers lossis diastereomers? Yog li ntawd tsis muaj exo ua los yog endo hauv qhov no. Cov khoom yuav, txawm li cas los xij, muaj nyob raws li kev sib xyaw ntawm cov enantiomers . [Note 2]. Thiab yog, ob lub molecules no yog cov enantiomers , tsis cov neeg txom nyem.
Tsis tas li ntawd, yog Diels Alder endothermic?
Yog, a Diels - Alder cov tshuaj tiv thaiv yog exothermic.
Vim li cas Endo nyiam tshaj Exo?, endo khoom yog nyiam tshaj Exo khoom hauv kev muaj tiag. Cov kws tshawb fawb xav tias qhov tshwm sim no yog vim muaj cov nyhuv stabilizing los ntawm cov tshuaj tiv thaiv ntawm pawg carbonyl thiab cov tshiab tsim pi daim ntawv cog lus hauv diene.
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