Why the standard enthalpy of hydrogenation of cyclohex-1,4-diene isdouble the value of that of cyclohexene while that of cyclohex-1,3-diene is less exothermic than double the value of that of cyclohexene?
standard enthalpy change of hydrogenation:
cyclohex-1,3-diene: -231
cyclohexa-1,4-diene: -240
cyclohexene: -120
aromatic compound/enthalpy of hydrogenation
2008-08-24 3:30 am
回答 (1)
2008-08-24 8:01 pm
✔ 最佳答案
I do think -231 and -240 are not so different...in my opinion, cyclohex-1,3-diene has conjugation, i.e. resonance structure.
thus is more stabilized. the addition of hydrogen is less exothermic.
cyclohexa-1,4-diene has no resonance structure.
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