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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C07D307/77
ortho- or peri-condensed with carbocyclic rings or ring systems
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C07D307/78
Benzo [b] furans; Hydrogenated benzo [b] furans
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C07D307/82
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 carbon atoms of the hetero ring
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C07D307/84
Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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