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Tautomer energy comparison

using model chemistry: MP2/6-31+G**

17 10 12 10 46
formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H6O sketch of Oxetane sketch of Propanal -117 -110 Oxetane Propanal -6
C4H8 sketch of cyclobutane sketch of 1-Butene -24 -33 cyclobutane 1-Butene 9