in position 2, the oxygen atom being in its keto or unsubstituted enol form

Full Title

Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom > not condensed with other rings > having one double bond between ring members or between a ring member and a non-ring member > with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms > Oxygen atoms > in position 2, the oxygen atom being in its keto or unsubstituted enol form

Classification Context

Section:

CHEMISTRY; METALLURGY

Class:

ORGANIC CHEMISTRY

Subclass:

HETEROCYCLIC COMPOUNDS