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Tautomer energy comparison

using model chemistry: LSDA/6-31+G**

17 10 12 10 46
formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C4H6 sketch of 1,2-Butadiene sketch of 1,3-Butadiene -23 -51 1,2-Butadiene 1,3-Butadiene 29
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne 31 3 1,2-Butadiene 1-Butyne 28
C4H6 sketch of 1,2-Butadiene sketch of 2-Butyne -2 -17 1,2-Butadiene 2-Butyne 15
C4H6 sketch of Cyclobutene sketch of 1,3-Butadiene -6 -49 Cyclobutene 1,3-Butadiene 43
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 50 42 Methylenecyclopropane 1-Methylcyclopropene 8
C4H6S sketch of Thiophene, 2,5-dihydro- sketch of Thiophene, 2,3-dihydro- -6 4 Thiophene, 2,5-dihydro- Thiophene, 2,3-dihydro- -10
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,4-Pentadiene 40 25 1,3-Pentadiene, (E)- 1,4-Pentadiene 15
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene 56 64 1,3-Pentadiene, (E)- 1,2-Pentadiene -8
C5H10 sketch of Cyclopropane, 1,1-dimethyl- sketch of 1-Butene, 2-methyl- -1 -29 Cyclopropane, 1,1-dimethyl- 1-Butene, 2-methyl- 28
C5H10 sketch of 1-Butene, 2-methyl- sketch of 2-Butene, 2-methyl- -15 -5 1-Butene, 2-methyl- 2-Butene, 2-methyl- -10