E因子计算器 — 公式
## Degree of Unsaturation (Index of Hydrogen Deficiency)
The degree of unsaturation tells how many rings and/or double bonds are in a molecule. Each ring or double bond reduces the hydrogen count by 2 relative to the fully saturated formula.
### Formula
**DoU = (2C + 2 + N - H - X) / 2**
where C = carbons, H = hydrogens, N = nitrogens, X = halogens. Oxygen and sulfur are not included because they do not change the hydrogen count. A DoU of 4 for a C6 compound suggests a benzene ring.
The degree of unsaturation tells how many rings and/or double bonds are in a molecule. Each ring or double bond reduces the hydrogen count by 2 relative to the fully saturated formula.
### Formula
**DoU = (2C + 2 + N - H - X) / 2**
where C = carbons, H = hydrogens, N = nitrogens, X = halogens. Oxygen and sulfur are not included because they do not change the hydrogen count. A DoU of 4 for a C6 compound suggests a benzene ring.
计算示例
Calculate the degree of unsaturation for benzene (C6H6).
- DoU = (2 × 6 + 2 + 0 - 6 - 0) / 2
- DoU = (12 + 2 - 6) / 2 = 8 / 2 = 4
- Benzene has 3 double bonds + 1 ring = 4 DoU