3-Methyl-2-cyclopentanone
1. Introduction to 3-methyl-2-cyclopentanone
English name: 3-Methyl-2-cyclopenten-1-one
CAS RN：2758-18-1
Constitutional formula ：
Formula: C6H8O
Molecular weight: 96.13
Boiling point: 157.5°C (74 °C at 15 mm Hg)
Melting point: 3-5℃ (lit)
Density: 0.971g/ml (25℃)
Appearance: Transparent liquid ranging from pale yellow to brown.
Use: As a spice.
2. Quality standards
| project | metric | bear fruit | remarks |
| surface | Colorless or pale yellow liquid | Colorless liquid | |
| content ，% | ≥99.0 | 99.0 | GC (column temperature 120℃, vaporization 220℃, detection 250℃, injection 0.1g/1ml methanol) |
| loss on drying ，% | - | ||
| +MS ，M-1 | 97.1 | 97.1 | |
| NMR（1H, 13C） | No significant peaks | No significant peaks |
