Molekula
1-(Trimethylsiloxy)cyclopentene
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
1-(Trimethylsiloxy)cyclopentene is a silyl enol ether used primarily as a versatile intermediate in organic synthesis, particularly in the preparation of complex molecules, natural products, and pharmaceuticals. It enables selective reactions such as aldol condensations and Diels-Alder cycloadditions due to its reactive enol ether functionality. This chemical has a CAS number of 19980-43-9, with the molecular formula C8H16OSi (C5H7OSi(CH3)3) and a molecular weight of 156.30 g/mol. It should be stored at ambient conditions, and while it carries a warning signal word, it is generally stable under proper handling. Molekula supplies 1-(Trimethylsiloxy)cyclopentene from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Specifications
| Property | Value |
|---|---|
| Appearance | Colourless to Light Yellow Liquid |
| Purity | ⩾ 95.0% |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 36 °C |
| Transport Class | 3 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90033018 |
| CAS Number | 19980-43-9 |
| IUPAC Name | cyclopenten-1-yloxy(trimethyl)silane |
| EC Number | 243-448-4 |
| Molecular Formula | C5H7OSi(CH3)3 |
| Molecular Weight | 156.30 |
| Exact Mass | 156.097 |
| SMILES | C[Si](C)(C)OC1=CCCC1 |
| InChIKey | UBMYYGXGMPGCBO-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H16OSi/c1-10(2,3)9-8-6-4-5-7-8/h6H,4-5,7H2,1-3H3 |
| PubChem CID | 88326 |
| UN Number | UN1993 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2931909010 |
| Tariff Code | 2931900090 |
Safety & GHS
-
Flammable
GHS02
-
Health Hazard
GHS07
Hazard statements
- H226 Flammable liquid and vapour
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- (1-Cyclopenten-1-yloxy)trimethylsilane
- (1-Cyclopentenyloxy)trimethylsilane
- (cyclopent-1-en-1-yloxy)trimethylsilane
- 1-(Trimethylsiloxy)-1-cyclopentene
- 1-[(Trimethylsilyl)oxy]cyclopentene
- cyclopenten-1-yloxy(trimethyl)silane
- Cyclopentene, 1-[(trimethylsilyl)oxy]-
- cyclopentenyloxytrimethylsilane
- Silane, (1-cyclopenten-1-yloxy)trimethyl-
- Trimethylsilyloxy-1-cyclopentene
Frequently asked questions
What is 1-(Trimethylsiloxy)cyclopentene commonly used for?
This compound is primarily used as a **silyl enol ether** in organic synthesis, particularly for **aldol reactions**, **Diels-Alder reactions**, and as a protecting group for carbonyl compounds.
What is the chemical formula and molecular weight?
The formula is **C₅H₇OSi(CH₃)₃** (C₈H₁₆OSi), and the molecular weight is **156.30 g/mol**.
How should 1-(Trimethylsiloxy)cyclopentene be stored?
Store at **ambient temperature** in a cool, dry place, away from moisture and strong oxidizing agents. Keep the container tightly sealed.
What purity grades are available for this product?
We supply this compound in **technical grade (≥95%)** and **analytical/reagent grade (≥98%)**—please specify your required purity at ordering.
Can Molekula supply this product in bulk quantities?
Yes, we offer **bulk packaging** (5kg, 25kg, and 100kg drums) for large-scale orders—contact our sales team for pricing and lead times.
What documentation is provided with an order of 1-(Trimethylsiloxy)cyclopentene?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific documentation** for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.