1-(Trimethylsiloxy)cyclopentene
Synonym(s):1-Cyclopentenyloxytrimethylsilane;Cyclopentanone enol trimethyl silyl ether
- CAS NO.：19980-43-9
- Empirical Formula: C8H16OSi
- Molecular Weight: 156.3
- MDL number: MFCD00001395
- EINECS: 243-448-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:22:49
What is 1-(Trimethylsiloxy)cyclopentene?
Chemical properties
Clear light yellow liquid
The Uses of 1-(Trimethylsiloxy)cyclopentene
1-(Trimethylsiloxy)cyclopentene may be used in chemical synthesis studies.
Purification Methods
If too impure as seen by the NMR spectrum, then dissolve it in 10 volumes of pentane, shake with cold NaHCO3 (3 x 500mL), then 1.5M HCl (200mL) and aqueous NaHCO3 (200mL) again, dry (Na2SO4), filter, evaporate and distil it through a short Vigreux column (p 11). 1H NMR: (CDCl3) : 0.21 (s, 9H), 1.55 (m, 2H), 1.69 (m, 2H), 2.05 (br d, 4H) and 4.88 (br s, 1H). GLPC in a 6ft x 1/8inch with 3% SP2100 on 100-120 mesh Supelcoport column should give one peak. Store dry. [For the cyclohexene analogue see Varghese et al. Org Synth Coll Vol VIII 460 1993.]
Properties of 1-(Trimethylsiloxy)cyclopentene
| Boiling point: | 45 °C/11 mmHg (lit.) |
| Density | 0.878 g/mL at 25 °C (lit.) |
| refractive index | n |
| Flash point: | 101 °F |
| storage temp. | −20°C |
| form | clear liquid |
| color | Colorless to Light yellow to Light orange |
| Specific Gravity | 0.878 |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| BRN | 385956 |
| CAS DataBase Reference | 19980-43-9(CAS DataBase Reference) |
| EPA Substance Registry System | Silane, (1-cyclopenten-1-yloxy)trimethyl- (19980-43-9) |
Safety information for 1-(Trimethylsiloxy)cyclopentene
| Signal word | Warning |
| Pictogram(s) |
 Flame Flammables GHS02  Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H226:Flammable liquids H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 1-(Trimethylsiloxy)cyclopentene
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