Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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307/00
Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
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C07D307/02
not condensed with other rings
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C07D307/34
having two or three double bonds between ring members or between ring members and non-ring members
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C07D307/56
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
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C07D307/58
One oxygen atom, e.g. butenolide
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