417503
Naming heterocycles
- Named rings
- Hantzsch-Widman System
- Heteroatoms at begining
- 1. O oxa
- 2. S thia
- 3. Se selena
- 4. Te tellura
- 5. N aza
- 6. P phospha
- 7. As arsa
- 8. Sb stiba
- 9. Si sila
- 10. Ge germa
- 11. B bora
- 1. O oxa
- Endings indicate ring size and degree of saturation
- Ring size
- 3- ir
- 4- et
- 5-ol
- 6- i/a
- 7- ep
- 8- op
- 3- ir
- No N
- un sat
- e/ene/ine
- e/ene/ine
- 2H
- ane
- ane
- un sat
- N present
- un sat
- e/ine/ane
- e/ine/ane
- 2H
- ine
- ine
- un sat
- Ring size
- Heteroatoms at begining
- Fused heterocycles
- Determine senior ring
- N present in one ring only then senior
- If not...
- Highest atom priority
- Larger>Smaller
- Ring with most heteroatoms
- Same size ring same number of atoms-
highest priority heteroatoms
- Same size ring, number and
nature- Lowest numbering
- Same size ring, number and
nature- Lowest numbering
- Same size ring same number of atoms-
highest priority heteroatoms
- Ring with most heteroatoms
- Larger>Smaller
- Highest atom priority
- If not...
- N present in one ring only then senior
- Multiple fusion
- Align maximum number of rings horizontal
and any extra pointing to the top right
- Start numbering from most anticlockwise
position on top right ring
- Between 1 and 2 side is a etc.
- [1,2-a]
- [1,2-a]
- Between 1 and 2 side is a etc.
- Start numbering from most anticlockwise
position on top right ring
- Align maximum number of rings horizontal
and any extra pointing to the top right
- Determine senior ring
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