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Tautomer energy comparison

using model chemistry: HF/6-31G*

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 -7 -7 allene propyne 0
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene 48 42 Methylenecyclopropane 1-Methylcyclopropene 7
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene -84 -82 1-Methylcyclopropene 1,2-Butadiene -2
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene -57 -49 Cyclobutene 1,3-Butadiene -8
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene -50 -51 1,2-Butadiene 1,3-Butadiene 1
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne 3 3 1,2-Butadiene 1-Butyne -0
C4H6 sketch of 1,2-Butadiene sketch of 2-Butyne -25 -17 1,2-Butadiene 2-Butyne -8
C3H6O sketch of Oxetane sketch of Propanal -121 -110 Oxetane Propanal -10
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone 36 29 2-Propenoic acid β–Propiolactone 8
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- 6 4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- 2
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,4-Pentadiene 29 25 1,3-Pentadiene, (E)- 1,4-Pentadiene 4
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene 65 64 1,3-Pentadiene, (E)- 1,2-Pentadiene 1
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- -48 -52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- 4
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- -31 -29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- -2
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- -7 -5 1-Butene, 2-methyl- 2-Butene, 2-methyl- -2