return to home page Computational Chemistry Comparison and Benchmark DataBase Release 20 (August 2019) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Comparisons > Energy > Similar molecules > Sets of tautomers

Tautomer energy comparison

using model chemistry: B2PLYP/cc-pVTZ

17 10 12 10 46
formula sketch Energy (kJ mol-1) Name difference
A B calculated experiment A B
C3H4 sketch of allene sketch of propyne -2 -7 allene propyne 5
C4H6 sketch of 1,2-Butadiene sketch of 1-Butyne 8 3 1,2-Butadiene 1-Butyne 5
C4H6 sketch of 1,2-Butadiene sketch of 2-Butyne -17 -17 1,2-Butadiene 2-Butyne -0
C4H6 sketch of 1-Methylcyclopropene sketch of 1,2-Butadiene -83 -82 1-Methylcyclopropene 1,2-Butadiene -1
C4H6 sketch of Methylenecyclopropane sketch of 1-Methylcyclopropene 46 42 Methylenecyclopropane 1-Methylcyclopropene 4
C3H6O sketch of Oxetane sketch of Propanal -119 -110 Oxetane Propanal -9
C4H8 sketch of cyclobutane sketch of 1-Butene -35 -33 cyclobutane 1-Butene -2
C3H4O2 sketch of 2-Propenoic acid sketch of β–Propiolactone 42 29 2-Propenoic acid β–Propiolactone 13
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 33 25 1,3-Pentadiene, (E)- 1,4-Pentadiene 7
C5H8 sketch of 1,3-Pentadiene, (E)- sketch of 1,2-Pentadiene 62 64 1,3-Pentadiene, (E)- 1,2-Pentadiene -2
C5H8 sketch of 1,2-Butadiene, 3-methyl- sketch of 1,3-Butadiene, 2-methyl- -46 -52 1,2-Butadiene, 3-methyl- 1,3-Butadiene, 2-methyl- 5
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- -9 -5 1-Butene, 2-methyl- 2-Butene, 2-methyl- -4