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| Radical name | Formula | Based on rule no. |
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| Camphoroyl (preferred to 1,2,2-trimethyl-1,3- cyclopentanedicarbonyl) |
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C-404.1 |
| camphyl, see Bornyl |
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| Carbamoyl | ![]() |
C-431.2 |
| carbazido, see Carbonohydrazido |
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| Carbazolyl | ![]() |
B-2.11, B-5.11 |
| Carbazono | ![]() |
C-981.1, C-981.2 |
| Carbazoyl | ![]() |
C-984.1 |
| Carbodiazono | ![]() |
C-981.1, C-981.2 |
| Carbolinyl (a-,b-,g-) | ![]() |
B-2.11, B-5.11 |
| Carbonimidoyl | ![]() |
C-451.4 |
| Carbonohydrazido (preferred to carbohydrazido or carbazido) |
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C-981.1, C-981.2 |
| Carbonyl | , ![]() |
C-72.1, C-108.2, C-403.2 |
| Carbonyldioxy | ![]() |
C-205.2 |
| Carboxy | ![]() |
C-10.3, C-401.3 |
| Carboxylato | ![]() |
C-86.1 |
| Carenyl | ![]() |
A-72.1, A-75.2 |
| Caryl | ![]() |
A-72.1, A-75.2 |
| Chloro | ![]() |
C-10.1, C-102 |
| chlorocarbonyl, see Chloroformyl |
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| Chloroformyl (replacing chlorocarbonyl) |
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C-10.3, C-481.2 |
| Chloronio | ![]() |
C-82.1 |
| Chlorosyl | ![]() |
C-10.1, C-106.2 |
| Chlorothio | ![]() |
C-621.2 |
| Chloryl | ![]() |
C-10.1, C-106.2 |
| Cholanthrenyl | ![]() |
A-23.1, A-24.2 |
| Chromanyl | ![]() |
B-2.12, B-5.11 |
| Chromenyl | ![]() |
B-2.11, B-5.11 |
| Chrysenyl | ![]() |
A-21.1, A-24.2 |
| Cinnamoyl (preferred to 3-phenylpropenoyl) |
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C-404.1 |
| Cinnamyl | ![]() |
A-13.3 |
| Cinnmylidene | ![]() |
A-13.4 |
| Cinnolinyl | ![]() |
B-2.11, B-5.11 |
| Citraconoyl (unsubstituted only) |
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C-404.1 |
| Coronenyl | ![]() |
A-21.1, A-24.2 |
| Crotonoyl (preferred to trans-2-butenoyl) |
(trans) |
C-404.1 |
| crotyl, see 2-Butenyl |
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| Cumenyl (o-, m-, or p-) | ![]() |
A-13.1 |
| Cyanato | ![]() |
C-833.1 |
| Cyano | ![]() |
C-10.3, C-832.5 |
| Cyclobutyl | ![]() |
A-11.2 |
| Cycloheptyl | ![]() |
A-11.2 |
| Cyclohexadienyl (2,4- shown) | ![]() |
A-11.4 |
| Cyclohexadienylene | ![]() |
A-11.6 |
| Cyclohexadienylidene (2,4- shown) |
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A-11.5 |
| Cyclohexanecarbohydrazonoyl | ![]() |
C-451.2 |
| Cyclohexanecarbohydroximoyl | ![]() |
C-451.2 |
| Cyclohexanecarbonyl | ![]() |
C-403.2 |
| Cyclohexanecarbothioyl | ![]() |
C-543.3 |
| Cyclohexanecarboxamido | ![]() |
C-824.3 |
| Cyclohexanecarboximidoyl | ![]() |
C-451.2 |
| Cyclohexenyl | ![]() |
A-11.4 |
| Cyclohexenylene | ![]() |
A-11.6 |
| 2-Cyclohexenylidene | ![]() |
A-11.5 |
| Cyclohexyl | ![]() |
A-11.2 |
| Cyclohexylcarbonyl | ![]() |
C-403.2 |
| Cyclohexylene | ![]() |
A-11.6 |
| Cyclohexylidene | ![]() |
A-11.5 |
| Cyclohexylthiocarbonyl | ![]() |
C-543.3 |
| Cyclopentadienyl | ![]() |
A-11.4 |
| Cyclopentadienylidene | ![]() |
A-11.5 |
| Cyclopentanespirocyclobutyl | ![]() |
A-11.2, A-42.1 |
| Cyclopenta[a]phenanthryl | ![]() |
A-21, A-23.1, A-24.2 |
| 1,2-Cyclopentenophenanthryl | ![]() |
A-21, A-23.5, A-24.2 |
| Cyclopentenyl | ![]() |
A-11.4 |
| Cyclopentenylidene (2- shown) |
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A-11.5 |
| Cyclopentyl | ![]() |
A-11.2 |
| Cyclopentylene | ![]() |
A-11.6 |
| Cyclopentylidene | ![]() |
A-11.5 |
| Cyclopropyl | ![]() |
A-11.2 |
| Cystathionyl | ![]() |
C-421.1 |
| Cysteinyl | ![]() |
C-421.2 |
| Cystyl | ![]() |
C-421.1 |
Published with permission of the IUPAC by Advanced Chemistry Development, Inc., www.acdlabs.com, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact [email protected]