Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07D
HETEROCYCLIC COMPOUNDS
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311/00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
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C07D311/02
ortho- or peri-condensed with carbocyclic rings or ring systems
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C07D311/04
Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
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C07D311/22
with oxygen or sulfur atoms directly attached in position 4
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C07D311/26
with aromatic rings attached in position 2 or 3
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C07D311/28
with aromatic rings attached in position 2 only
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C07D311/30
not hydrogenated in the hetero ring, e.g. flavones
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