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IV.A.4.b.

Tautomer energy comparison

using model chemistry: BLYP/6-31G*

formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -17 7 allene propyne -24
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 63 49 Cyclobutene 1,3-Butadiene 14
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene 48 49 Cyclobutene 1,3-Butadiene -2
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene -44 -42 Methylenecyclopropane 1-Methylcyclopropene -3
C3H6O sketch of Oxetane sketch of Propanal 118 110 Oxetane Propanal 8
C4H8 sketch of cyclobutane sketch of 1-Butene 36 33 cyclobutane 1-Butene 3
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone -22 -29 2-Propenoic acid β–Propiolactone 7
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- 0 -4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- 5
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,4-Pentadiene -41 -25 1,3-Pentadiene, (E)- 1,4-Pentadiene -16
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene -58 -64 1,3-Pentadiene, (E)- 1,2-Pentadiene 6
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- -14
C4H8O sketch of Butanal sketch of Furan, tetrahydro- -45 -29 Butanal Furan, tetrahydro- -16
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- 38 29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- 9
C6H8 sketch of 1,4-Cyclohexadiene sketch of 1,3-Cyclohexadiene 2 3 1,4-Cyclohexadiene 1,3-Cyclohexadiene -0