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二醛（英语：dialdehyde，或称为二元醛、双醛）是指带有两个醛基官能团的脂肪醛或芳香醛[1]，属于二羰基化合物之一，有：
| 名称 | 化学式 | 结构 | CAS编号 |
|---|---|---|---|
| 乙二醛 | (CHO)2 |  |
107-22-2 |
| 丙二醛 | CHOCH2CHO |  |
542-78-9 |
| 丁二醛 | CHO(CH2)2CHO |  |
638-37-9 |
| 戊二醛 | CHO(CH2)3CHO |  |
111-30-8 |
| 己二醛 | CHO(CH2)4CHO |  |
1072-21-5 |
| 庚二醛 | CHO(CH2)5CHO | 53185-69-6 | |
| 辛二醛 | CHO(CH2)6CHO | 638-54-0 | |
| 壬二醛 | CHO(CH2)7CHO | 51651-40-2 | |
| 癸二醛 | CHO(CH2)8CHO | 45037-67-0 |
| 名称 | 化学式 | 结构 | CAS编号 |
|---|---|---|---|
| 甲基丙二醛 | CHOCHCH3CHO | 16002-19-0 | |
| 二甲基丙二醛 | CHOC(CH3)2CHO | 1185-34-8 | |
| 甲基丁二醛 | CHOCH(CH3)CH2CHO | 77713-01-0 |
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