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Tautomer energy comparison

using model chemistry: B3LYP/6-31G(2df,p)

17 10 12 10 46
formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne 11 -7 allene propyne 18
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene -39 -51 1,2-Butadiene 1,3-Butadiene 13
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne 23 3 1,2-Butadiene 1-Butyne 20
C4H6 sketch of 1,2-Butadiene sketch of 2-Butyne -7 -17 1,2-Butadiene 2-Butyne 9
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene -57 -49 Cyclobutene 1,3-Butadiene -7
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene -84 -82 1-Methylcyclopropene 1,2-Butadiene -2
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene 47 42 Methylenecyclopropane 1-Methylcyclopropene 5
C3H6O sketch of Oxetane sketch of Propanal -113 -110 Oxetane Propanal -3
C4H8 sketch of cyclobutane sketch of 1-Butene -30 -33 cyclobutane 1-Butene 2
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone 31 29 2-Propenoic acid β–Propiolactone 2
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- 0 4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- -4
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene 57 64 1,3-Pentadiene, (E)- 1,2-Pentadiene -8
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- -38 -52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- 13
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- -12 -5 1-Butene, 2-methyl- 2-Butene, 2-methyl- -7
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- -30 -29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- -1