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IV.A.4.b.

Tautomer energy comparison

using model chemistry: B1B95/6-31G*

formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -10 7 allene propyne -17
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 38 51 1,2-Butadiene 1,3-Butadiene -14
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 24 51 1,2-Butadiene 1,3-Butadiene -27
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 11 17 1,2-Butadiene 2-Butyne -6
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 29 49 Cyclobutene 1,3-Butadiene -20
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 15 49 Cyclobutene 1,3-Butadiene -34
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene 62 82 1-Methylcyclopropene 1,2-Butadiene -20
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene -44 -42 Methylenecyclopropane 1-Methylcyclopropene -3
C3H6O sketch of Oxetane sketch of Propanal 99 110 Oxetane Propanal -11
C4H8 sketch of cyclobutane sketch of 1-Butene 8 33 cyclobutane 1-Butene -24
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone -5 -29 2-Propenoic acid β–Propiolactone 23
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- 1 -4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- 5
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,4-Pentadiene -37 -25 1,3-Pentadiene, (E)- 1,4-Pentadiene -12
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene -56 -64 1,3-Pentadiene, (E)- 1,2-Pentadiene 9
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- 40 52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- -12
C4H8O sketch of Butanal sketch of Furan, tetrahydro- -21 -29 Butanal Furan, tetrahydro- 8
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- 13 5 1-Butene, 2-methyl- 2-Butene, 2-methyl- 8
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- 9 29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- -20
C6H8 sketch of 1,4-Cyclohexadiene sketch of 1,3-Cyclohexadiene 5 3 1,4-Cyclohexadiene 1,3-Cyclohexadiene 2