Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings [2]
309
/
02
•
having no double bonds between ring members or between ring members and non-ring members [2]
309
/
04
•
•
with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms [2]
309
/
06
•
•
•
Radicals substituted by oxygen atoms [2]
309
/
08
•
•
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 [2]
309
/
10
•
•
•
Oxygen atoms [2]
309
/
12
•
•
•
•
only hydrogen atoms and one oxygen atom directly attached to ring carbon atoms, e.g. tetrahydropyranyl ethers [2]
309
/
14
•
•
•
Nitrogen atoms not forming part of a nitro radical [2]
309
/
16
•
having one double bond between ring members or between a ring member and a non-ring member [2]
309
/
18
•
•
containing only hydrogen and carbon atoms in addition to the ring hetero atom [2]
309
/
20
•
•
with hydrogen atoms and substituted hydrocarbon radicals directly attached to ring carbon atoms [2]
309
/
22
•
•
•
Radicals substituted by oxygen atoms [2]
309
/
24
•
•
•
•
Methylol radicals [2]
309
/
26
•
•
•
•
Carboxaldehyde radicals [2]
309
/
28
•
•
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 [2]
309
/
30
•
•
•
Oxygen atoms, e.g. delta-lactones [2]
309
/
32
•
having two double bonds between ring members or between ring members and non-ring members [2]
309
/
34
•
having three or more double bonds between ring members or between ring members and non-ring members [2]
309
/
36
•
•
with oxygen atoms directly attached to ring carbon atoms [2]
309
/
38
•
•
•
one oxygen atom in position 2 or 4, e.g. pyrones [2]
309
/
40
•
•
•
Oxygen atoms attached in positions 3 and 4, e.g. maltol [2]
311
/
00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings [2]
311
/
02
•
ortho- or peri-condensed with carbocyclic rings or ring systems [2]
311
/
04
•
•
Benzo [b] pyrans, not hydrogenated in the carbocyclic ring [2]
311
/
06
•
•
•
with oxygen or sulfur atoms directly attached in position 2 [2]
311
/
08
•
•
•
•
not hydrogenated in the hetero ring [2]
311
/
10
•
•
•
•
•
unsubstituted [2]
311
/
12
•
•
•
•
•
substituted in position 3 and unsubstituted in position 7 [2]
311
/
14
•
•
•
•
•
substituted in position 6 and unsubstituted in position 7 [2]
311
/
16
•
•
•
•
•
substituted in position 7 [2]
311
/
18
•
•
•
•
•
substituted otherwise than in position 3 or 7 (substituted in position 4 by oxygen or sulfur C 07 D 311/42) [2]
311
/
20
•
•
•
•
hydrogenated in the hetero ring [2]
311
/
22
•
•
•
with oxygen or sulfur atoms directly attached in position 4 [2]
311
/
24
•
•
•
•
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 [2]
311
/
26
•
•
•
•
with aromatic rings attached in position 2 or 3 [2]
311
/
28
•
•
•
•
•
with aromatic rings attached in position 2 only [2]
311
/
30
•
•
•
•
•
•
not hydrogenated in the hetero ring, e.g. flavones [2]
311
/
32
•
•
•
•
•
•
2, 3-Dihydro derivatives, e.g. flavanones [2]
311
/
34
•
•
•
•
•
with aromatic rings attached in position 3 only [2]
311
/
36
•
•
•
•
•
•
not hydrogenated in the hetero ring, e.g. isoflavones [2]
311
/
38
•
•
•
•
•
•
2, 3-Dihydro derivatives, e.g. isoflavanones [2]
311
/
40
•
•
•
•
•
Separation, e.g. from natural material; Purification [2]
311
/
42
•
•
•
with oxygen or sulfur atoms in positions 2 and 4 [2]
311
/
44
•
•
•
•
with one hydrogen atom in position 3 [2]
311
/
46
•
•
•
•
•
unsubstituted in the carbocyclic ring [2]
311
/
48
•
•
•
•
•
•
with two such benzopyran radicals linked together by a carbon chain [2]
311
/
50
•
•
•
•
•
•
with elements other than carbon and hydrogen in position 3 [2]
311
/
52
•
•
•
•
•
•
Enol-esters or -ethers, or sulfur analogues thereof [2]
311
/
54
•
•
•
•
•
substituted in the carbocyclic ring [2]
311
/
56
•
•
•
•
without hydrogen atoms in position 3 [2]
311
/
58
•
•
•
other than with oxygen or sulfur atoms in position 2 or 4 [2]
311
/
60
•
•
•
•
with aryl radicals attached in position 2 [2]
311
/
62
•
•
•
•
•
with oxygen atoms directly attached in position 3, e.g. anthocyanidins [2]
311
/
64
•
•
•
•
with oxygen atoms directly attached in position 8 [2]
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 [2]
311
/
68
•
•
•
•
with nitrogen atoms directly attached in position 4 [2]
311
/
70
•
•
•
•
with two hydrocarbon radicals attached in position 2 and elements other than carbon and hydrogen in position 6 [2]
311
/
72
•
•
•
•
•
3, 4-Dihydro derivatives having in position 2 at least one methyl radical and in position 6 one oxygen atom, e.g. tocopherols [2]
311
/
74
•
•
Benzo [b] pyrans, hydrogenated in the carbocyclic ring [2]
311
/
76
•
•
Benzo [c] pyrans [2]
311
/
78
•
•
Ring systems having three or more relevant rings [2]
311
/
80
•
•
•
Dibenzopyrans; Hydrogenated dibenzopyrans [2]
311
/
82
•
•
•
•
Xanthenes [2]
311
/
84
•
•
•
•
•
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 in position 9 [2]
311
/
86
•
•
•
•
•
•
Oxygen atoms, e.g. xanthones [2]
311
/
88
•
•
•
•
•
•
Nitrogen atoms [2]
311
/
90
•
•
•
•
•
with hydrocarbon radicals, substituted by amino radicals, directly attached in position 9 [2]
311
/
92
•
•
•
Naphthopyrans; Hydrogenated naphthopyrans [2]
311
/
94
•
•
condensed with rings other than six-membered or with ring systems containing such rings [2,5]
311
/
96
•
spiro-condensed with carbocyclic rings or ring systems [2]
