4-tert-Butyldimethylsiloxy-3-penten-2-one
4-tert-Butyldimethylsiloxy-3-penten-2-one (CAS 69404-97-3, C11H22O2Si) is a versatile silyl enol ether. With a molecular weight of 214.38 g/mol, it serves as a valuable building block in organic synthesis. Its structure, featuring a tert-butyldimethylsilyl protecting group on the enol form of acetylacetone, makes it useful for introducing specific functionalities in complex molecule construction, particularly in areas requiring controlled reactivity.
- IUPAC
- Acetylacetone enol tert-butyldimethylsilyl ether

Organic Synthesis Intermediate
This compound acts as a key intermediate in the synthesis of various organic molecules. Its enol ether functionality allows for controlled reactions like alkylation or acylation.
Protecting Group Chemistry
The tert-butyldimethylsilyl (TBS) group is a common protecting group for enols. This compound can be used in multi-step syntheses where selective protection and deprotection of carbonyl compounds are required.
Building Block for Complex Molecules
As an organic building block, it contributes to the construction of more intricate molecular architectures in research and development settings.
| Molecular weight | 214.38 |
|---|---|
| Empirical formula | C11H22O2Si |
| Assay | ≥97.0% (GC) |
| Boiling point | 48-50 °C/0.2 mmHg |
| Density | 0.907 g/mL at 20 °C(lit.) |
| Refractive index | n20/D 1.462 |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 80 °C / 176 °F |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36/37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-tert-Butyldimethylsiloxy-3-penten-2-one used for?
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4-tert-Butyldimethylsiloxy-3-penten-2-one is primarily used as a versatile intermediate and building block in organic synthesis, particularly in reactions involving silyl enol ethers and protecting group chemistry.
What are the CAS number and formula for this chemical?
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The CAS number is 69404-97-3, and the empirical formula is C11H22O2Si.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies this chemical with an assay of ≥97.0% (GC). We do not represent this product as USP, BP, or EP grade.
How should 4-tert-Butyldimethylsiloxy-3-penten-2-one be handled safely?
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This compound is classified as a Warning with hazards including skin irritation (H315), serious eye irritation (H319), and respiratory tract irritation (H335). Appropriate personal protective equipment, such as eyeshields, gloves, and a suitable respirator, should be used. Handle in a well-ventilated area.
Is 4-tert-Butyldimethylsiloxy-3-penten-2-one a controlled substance?
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Based on the provided data, there is no indication that 4-tert-Butyldimethylsiloxy-3-penten-2-one is a controlled substance.
How can I request a sample or quote?
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Please contact our sales team through the website or by phone to request a sample or a quotation for 4-tert-Butyldimethylsiloxy-3-penten-2-one.
How is this product packed and shipped?
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We offer secure and compliant packaging suitable for chemical export, adhering to international shipping regulations. Specific packing details can be confirmed upon order placement.
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