Structural Isomer - Isomer Counting

Isomer Counting

As an example of isomer counting, there are nine structural isomers with molecular formula C3H6O having different bond connectivities. Seven of them are air-stable at ambient temperature, and are given in the table below. An additional two structural isomers are the enol tautomers of the carbonyl isomers, but these are not stable.

Chemical compound Molecular structure Melting point (°C) Boiling point (°C) Comment
Allyl alcohol -129 97
Cyclopropanol 101–102
Propanal - 81 48 Tautomeric with (E)-1-propenol and (Z)-1-propenol
Acetone - 94.9 56.53 Tautomeric with 2-propenol
Oxetane - 97 48
Propylene oxide - 112 34 Can be resolved in two enantiomers
Methyl vinyl ether - 122 6

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