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IV.A.4.b.

Tautomer energy comparison

using model chemistry: B3LYP/CEP-121G*

formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -9 7 allene propyne -16
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 43 51 1,2-Butadiene 1,3-Butadiene -8
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene 28 51 1,2-Butadiene 1,3-Butadiene -23
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne -20 -3 1,2-Butadiene 1-Butyne -17
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 39 49 Cyclobutene 1,3-Butadiene -11
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 54 49 Cyclobutene 1,3-Butadiene 4
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene 87 82 1-Methylcyclopropene 1,2-Butadiene 5
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene -45 -42 Methylenecyclopropane 1-Methylcyclopropene -4
C3H6O sketch of Oxetane sketch of Propanal 106 110 Oxetane Propanal -4
C4H8 sketch of cyclobutane sketch of 1-Butene 27 33 cyclobutane 1-Butene -5
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone -24 -29 2-Propenoic acid β–Propiolactone 5
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 -34 -25 1,3-Pentadiene, (E)- 1,4-Pentadiene -9
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene -59 -64 1,3-Pentadiene, (E)- 1,2-Pentadiene 5
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- 42 52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- -10
C4H8O sketch of Butanal sketch of Furan, tetrahydro- -30 -29 Butanal Furan, tetrahydro- -1
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- 9 5 1-Butene, 2-methyl- 2-Butene, 2-methyl- 4
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- 34 29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- 5
C6H8 sketch of 1,4-Cyclohexadiene sketch of 1,3-Cyclohexadiene 2 3 1,4-Cyclohexadiene 1,3-Cyclohexadiene -1