Table 5 Prediction of the IUPAC name of tautomers

Cyanamide (enamine-imine)

Cyanamide/methanediimine

Cyanamide /

methanediimine

Glucic acid (keto-enol)

2-hydroxypropanedial /

2,3-dihydroxyprop-2-enal

2-hydroxypropanedial /

2,3-dihydroxyprop-2-enal

γ-Lactam (lactam-lactim)

pyrrolidin-2-one /

3,4-dihydro-2H-pyrrol-5-ol

pyrrolidin-2-one

Guanine

2-amino-1,7-dihydropurin-6-one

2-amino-1,7-dihydropurin-6-one

Guanine^a

N/A

2-amino-1,7-dihydropurin-6-one

Oxazolium (mobile proton)

4,5-dihydro-1,3-oxazol-3-ium

4,5-dihydro-1,3-oxazol-3-ium