There are 27 isomers of pentamethylheptane, as shown in the table below. 2,2,4,6,6-pentamethylheptane is the most common one. Our company's products are single molecule pure substances. In the case of pentamethylheptane, it usually refers to the mixture of isomers. Physical properties are different.
| No | molecular structure | CAS |
| 1 | 2，2，3，3，4—pentamethylheptane | |
| 2 | 2，2，3，3，5—pentamethylheptane | |
| 3 | 2，2，3，3，6—pentamethylheptane | |
| 4 | 2，2，3，4，4—pentamethylheptane | |
| 5 | 2，2，3，4，5—pentamethylheptane | |
| 6 | 2，2，3，4，6—pentamethylheptane | |
| 7 | 2，2，3，5，5—pentamethylheptane | |
| 8 | 2，2，3，5，6—pentamethylheptane | |
| 9 | 2，2，3，6，6—pentamethylheptane | |
| 10 | 2，2，4，4，5—pentamethylheptane | |
| 11 | 2，2，4，4，6—pentamethylheptane | 62199-62-6 |
| 12 | 2，2，4，5，5—pentamethylheptane | |
| 13 | 2，2，4，5，6—pentamethylheptane | |
| 14 | 2，2，4，6，6—pentamethylheptane | 13475-82-6 |
| 15 | 2，2，5，5，6—pentamethylheptane | |
| 16 | 2，3，3，4，4—pentamethylheptane | |
| 17 | 2，3，3，4，5—pentamethylheptane | |
| 18 | 2，3，3，4，6—pentamethylheptane | |
| 19 | 2，3，3，5，5—pentamethylheptane | |
| 20 | 2，3，3，5，6—pentamethylheptane | |
| 21 | 2，3，4，4，5—pentamethylheptane | |
| 22 | 2，3，4，4，6—pentamethylheptane | |
| 23 | 2，3，4，5，5—pentamethylheptane | |
| 24 | 2，3，4，5，6—pentamethylheptane | |
| 25 | 2，4，4，5，5—pentamethylheptane | |
| 26 | 3，3，4，4，5—pentamethylheptane | |
| 27 | 3，3，4，5，5—pentamethylheptane |