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IV.A.4.b.

Tautomer energy comparison

using model chemistry: B3LYP/6-31G*

formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -12 7 allene propyne -19
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 26 51 1,2-Butadiene 1,3-Butadiene -26
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene -46 -42 Methylenecyclopropane 1-Methylcyclopropene -4
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene 83 82 1-Methylcyclopropene 1,2-Butadiene 1
C4H6 sketch of 1,2-Butadiene sketch of 2-Butyne 8 17 1,2-Butadiene 2-Butyne -9
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 40 51 1,2-Butadiene 1,3-Butadiene -11
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne -25 -3 1,2-Butadiene 1-Butyne -22
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 39 49 Cyclobutene 1,3-Butadiene -10
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 53 49 Cyclobutene 1,3-Butadiene 4
C3H6O sketch of Oxetane sketch of Propanal 113 110 Oxetane Propanal 2
C4H8 sketch of cyclobutane sketch of 1-Butene 27 33 cyclobutane 1-Butene -5
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone -20 -29 2-Propenoic acid β–Propiolactone 8
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- -1 -4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- 3
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,4-Pentadiene -38 -25 1,3-Pentadiene, (E)- 1,4-Pentadiene -13
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- 39 52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- -12
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene -59 -64 1,3-Pentadiene, (E)- 1,2-Pentadiene 6
C4H8O sketch of Butanal sketch of Furan, tetrahydro- -35 -29 Butanal Furan, tetrahydro- -6
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- 30 29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- 1
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- 12 5 1-Butene, 2-methyl- 2-Butene, 2-methyl- 7
C6H8 sketch of 1,4-Cyclohexadiene sketch of 1,3-Cyclohexadiene 1 3 1,4-Cyclohexadiene 1,3-Cyclohexadiene -2