Preparation, separation, purification, or stabilisation of unsubstituted lactams [2]
201
/
02
•
Preparation of lactams [2]
201
/
04
•
•
from or via oximes by Beckmann rearrangement [2]
201
/
06
•
•
•
from ketones by simultaneous oxime formation and rearrangement [2]
201
/
08
•
•
from carboxylic acids or derivatives thereof, e.g. hydroxy carboxylic acids, lactones, nitriles [2]
201
/
10
•
•
from cycloaliphatic compounds by simultaneous nitrosylation and rearrangement [2]
201
/
12
•
•
by depolymerising polyamides [2]
201
/
14
•
Preparation of salts or adducts of lactams [2]
201
/
16
•
Separation or purification (separation of inorganic salts C 01) [2]
201
/
18
•
Stabilisation [2]
203
/
00
Heterocyclic compounds containing three-membered rings with one nitrogen atom as the only ring hetero atom [2]
203
/
02
•
Preparation by ring-closure [2]
203
/
04
•
not condensed with other rings [2]
203
/
06
•
•
having no double bonds between ring members or between ring members and non-ring members [2]
203
/
08
•
•
•
with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring nitrogen atom [2]
203
/
10
•
•
•
•
Radicals substituted by singly bound oxygen atoms [2]
203
/
12
•
•
•
•
Radicals substituted by nitrogen atoms not forming part of a nitro radical [2]
203
/
14
•
•
•
•
with carbocyclic rings directly attached to the ring nitrogen atom [2]
203
/
16
•
•
•
with acylated ring nitrogen atoms [2]
203
/
18
•
•
•
•
by carboxylic acids, or by sulfur or nitrogen analogues thereof [2]
203
/
20
•
•
•
•
by carbonic acid, or by sulfur or nitrogen analogues thereof, e.g. carbamates [2]
203
/
22
•
•
•
with hetero atoms directly attached to the ring nitrogen atom [2]
203
/
24
•
•
•
•
Sulfur atoms [2]
203
/
26
•
condensed with carbocyclic rings or ring systems [2]
205
/
00
Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom [2]
205
/
02
•
not condensed with other rings [2]
205
/
04
•
•
having no double bonds between ring members or between ring members and non-ring members [2]
205
/
06
•
•
having one double bond between ring members or between a ring member and a non-ring member [2]
205
/
08
•
•
•
with one oxygen atom directly attached in position 2, e.g. beta-lactams [2]
205
/
085
•
•
•
•
with a nitrogen atom directly attached in position 3 [5]
205
/
09
•
•
•
•
with a sulfur atom directly attached in position 4 [5]
205
/
095
•
•
•
•
•
and with a nitrogen atom directly attached in position 3 [5]
205
/
10
•
•
having two double bonds between ring members or between ring members and non-ring members [2]
205
/
12
•
condensed with carbocyclic rings or ring systems [2]
207
/
00
Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom [2]
Note
Pyrrolidines having only hydrogen atoms attached to the ring carbon atoms are classified in group C 07 D 295/00. [2]
207
/
02
•
with only hydrogen or carbon atoms directly attached to the ring nitrogen atom [2]
207
/
04
•
•
having no double bonds between ring members or between ring members and non-ring members [2]
207
/
06
•
•
•
with radicals, containing only hydrogen and carbon atoms, attached to ring carbon atoms [2]
207
/
08
•
•
•
with hydrocarbon radicals, substituted by hetero atoms, attached to ring carbon atoms [2]
207
/
09
•
•
•
•
Radicals substituted by nitrogen atoms not forming part of a nitro radical [3]
207
/
10
•
•
•
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]
207
/
12
•
•
•
•
Oxygen or sulfur atoms [2]
207
/
14
•
•
•
•
Nitrogen atoms not forming part of a nitro radical [2]
207
/
16
•
•
•
•
Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals [2]
207
/
18
•
•
having one double bond between ring members or between a ring member and a non-ring member [2]
207
/
20
•
•
•
with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms [2]
207
/
22
•
•
•
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]
207
/
24
•
•
•
•
Oxygen or sulfur atoms [2]
207
/
26
•
•
•
•
•
2-Pyrrolidones [2]
207
/
263
•
•
•
•
•
•
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms [3]
207
/
267
•
•
•
•
•
•
•
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom [3]
207
/
27
•
•
•
•
•
•
•
with substituted hydrocarbon radicals directly attached to the ring nitrogen atom [3]
207
/
273
•
•
•
•
•
•
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 other ring carbon atoms [3]
207
/
277
•
•
•
•
•
•
•
Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals [3]
207
/
28
•
•
•
•
•
•
•
•
2-Pyrrolidone-5- carboxylic acids; Functional derivatives thereof, e.g. esters, nitriles [2,3]
207
/
30
•
•
having two double bonds between ring members or between ring members and non-ring members [2]
207
/
32
•
•
•
with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms [2]
207
/
323
•
•
•
•
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atoms [3]
207
/
325
•
•
•
•
with substituted hydrocarbon radicals directly attached to the ring nitrogen atom [3]
207
/
327
•
•
•
•
•
Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals [3]
207
/
33
•
•
•
•
with substituted hydrocarbon radicals, directly attached to ring carbon atoms [3]
207
/
333
•
•
•
•
•
Radicals substituted by oxygen or sulfur atoms [3]
207
/
335
•
•
•
•
•
Radicals substituted by nitrogen atoms not forming part of a nitro radical [3]
207
/
337
•
•
•
•
•
Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals [3]
207
/
34
•
•
•
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]
207
/
36
•
•
•
•
Oxygen or sulfur atoms [2]
207
/
38
•
•
•
•
•
2-Pyrrolones [2]
207
/
40
•
•
•
•
•
2,5-Pyrrolidine-diones [2]
207
/
404
•
•
•
•
•
•
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. succinimide [3]
207
/
408
•
•
•
•
•
•
•
Radicals containing only hydrogen and carbon atoms attached to ring carbon atoms [3]
207
/
412
•
•
•
•
•
•
•
•
Acyclic radicals containing more than six carbon atoms [3]
207
/
416
•
•
•
•
•
•
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 other ring carbon atoms [3]
207
/
42
•
•
•
•
Nitro radicals [2]
207
/
44
•
•
having three double bonds between ring members or between ring members and non-ring members [2]
207
/
444
•
•
•
having two doubly-bound oxygen atoms directly attached in positions 2 and 5 [3]
207
/
448
•
•
•
•
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. maleimide [3]
207
/
452
•
•
•
•
•
with hydrocarbon radicals, substituted by hetero atoms, directly attached to the ring nitrogen atom [3]
207
/
456
•
•
•
•
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 other ring carbon atoms [3]
207
/
46
•
with hetero atoms directly attached to the ring nitrogen atom [2]
