What Is 4-((tert-Butyldimethylsilyl)oxy)butanal and Why Is It Used?

4-((tert-Butyldimethylsilyl)oxy)butanal (SKU O725176) is a four-carbon bifunctional building block bearing two distinct reactive sites: an aldehyde at C-1 and a TBS (tert-butyldimethylsilyl)-protected primary hydroxyl at C-4. The TBS group is one of the most commonly employed silyl protecting groups in synthetic organic chemistry because it offers a favorable balance of stability under a wide range of reaction conditions while remaining cleanly removable under mild fluoride-based (e.g., TBAF in THF) or dilute acidic conditions.

The compound is valued because it allows chemists to exploit the aldehyde for carbon–carbon bond-forming reactions—such as aldol additions, Wittig olefinations, reductive aminations, or nucleophilic additions—while keeping the primary hydroxyl function latent and protected. This orthogonal reactivity makes it an efficient C4 linker or chain-extender in the synthesis of complex natural products, pharmaceutical active ingredients, and chiral building blocks.

How Should This Compound Be Handled and Stored?

Moisture sensitivity: The TBS silyl ether linkage is susceptible to hydrolysis under aqueous acidic conditions, and prolonged exposure to atmospheric moisture can gradually degrade the protecting group. All weighing and transfers should be performed under an inert atmosphere (nitrogen or argon) using standard Schlenk or glovebox techniques, or at minimum with brief, careful exposure to air.

Aldehyde stability: The aldehyde functional group is susceptible to aerial oxidation over time. Reagent vials should be tightly resealed after each use, stored under inert gas, and kept in a cool, dry location—ideally a refrigerator or freezer, protected from light.

Incompatibilities: Avoid contact with strong acids (which cleave the TBS ether prematurely), strong oxidants, and strong bases, which may promote aldol self-condensation of the aldehyde. Consult the Safety Data Sheet (SDS) for full hazard information before use.

Personal protection: Use appropriate PPE including chemical-resistant gloves, safety glasses, and a lab coat. Work in a well-ventilated fume hood. Refer to the current SDS for first-aid measures and disposal regulations.

What Are the Key Synthetic Applications?

Aldol and related reactions: The aldehyde terminus is a reactive electrophile suitable for Evans aldol reactions, Mukaiyama aldol reactions with silyl enol ethers, and related asymmetric additions, enabling rapid growth of molecular complexity from a simple C4 unit.

Wittig and Horner–Wadsworth–Emmons olefinations: The aldehyde reacts cleanly with stabilized and non-stabilized phosphorus ylides to yield α,β-unsaturated esters, aldehydes, or other alkenes, with the TBS-protected alcohol remaining intact under standard conditions.

Reductive amination: Treatment with primary or secondary amines under reductive conditions (e.g., NaBH₃CN or NaBH(OAc)₃) furnishes amine products while preserving the silyl ether, making this compound useful for building amine-containing side chains.

Natural product and pharmaceutical synthesis: The C4 framework with an aldehyde and a masked hydroxyl is a recurring motif in polyol natural products, macrolide fragments, and prostaglandin-related syntheses. The TBS ether can be selectively deprotected at the appropriate stage to reveal the free alcohol for further functionalization.

Grignard and organolithium additions: Nucleophilic addition to the aldehyde with organometallic reagents gives secondary alcohols that can be further elaborated, with the remote TBS ether providing no interference under standard anhydrous conditions.

How Do I Order and What Purity Can I Expect?

Ordering: 4-((tert-Butyldimethylsilyl)oxy)butanal is available from Aladdin Scientific under SKU O725176. Orders can be placed through the Aladdin Scientific website, by contacting your regional sales representative, or via institutional procurement systems. Quantity options and current pricing are listed on the product page.

Purity and quality: Aladdin Scientific reagents are supplied with lot-specific quality control data. Typical purity specifications for research-grade silyl ether aldehydes are assessed by GC or NMR analysis. Customers requiring a specific purity threshold for sensitive applications should consult the Certificate of Analysis (CoA) available for each lot, or contact technical support to discuss suitability for their application.

Lead time and availability: Standard stock items are typically dispatched promptly; please check the product page for current inventory status. For bulk or custom quantities, contact the Aladdin Scientific sales team directly.