other than with oxygen or sulphur atoms in position 2 or 4

Full Title

Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings > ortho- or peri-condensed with carbocyclic rings or ring systems > Benzo[b]pyrans, not hydrogenated in the carbocyclic ring > other than with oxygen or sulphur atoms in position 2 or 4

Child Classifications

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• C07D 311/60 with aryl radicals attached in position 2
• C07D 311/64 with oxygen atoms directly attached in position 8
• C07D 311/66 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 in position 2
• C07D 311/68 with nitrogen atoms directly attached in position 4
• C07D 311/70 with two hydrocarbon radicals attached in position 2 and elements other than carbon and hydrogen in position 6