Sodium Triacetoxyborohydride (STAB) CAS 56553-60-7 is a mild, selective, and widely used reducing agent in organic synthesis, particularly valued for its effectiveness in reductive amination reactions. Also known as NaBH(OAc)₃ or sodium triacetoxyhydroborate, this compound enables the efficient conversion of aldehydes and ketones to amines without reducing most ketones excessively, making it ideal for one-pot procedures.

Key Specifications

  • Chemical Name: Sodium triacetoxyborohydride
  • CAS Number: 56553-60-7
  • Molecular Formula: C₆H₁₀BNaO₆ or Na[(CH₃COO)₃BH]
  • Molecular Weight: 211.94 g/mol
  • Appearance: White to off-white crystalline powder
  • Purity: Typically ≥95–98% (high-purity grades available for synthesis and research)
  • Synonyms: STAB, NaBH(OAc)₃, Sodium triacetoxyhydroborate, Sodium tris(acetato)hydroborate

How Sodium Triacetoxyborohydride Works

STAB acts as a mild hydride donor that selectively reduces iminium ions formed in situ during reductive amination. It reduces aldehydes readily but is much slower with most ketones, allowing direct reductive amination of carbonyl compounds with primary or secondary amines in the presence of acetic acid (which catalyzes imine/iminium formation). This selectivity avoids over-reduction and enables clean, high-yielding transformations under mild conditions, often in solvents like dichloromethane (DCM), 1,2-dichloroethane (DCE), THF, or dioxane.

Unlike stronger reducing agents like NaBH₄ or LiAlH₄, STAB is compatible with many functional groups and does not generate toxic byproducts like cyanide (as with NaBH₃CN).

Primary Applications

  • Reductive amination of aldehydes and ketones to form secondary and tertiary amines (one-pot direct method)
  • Synthesis of pharmaceuticals, agrochemicals, and fine chemicals (e.g., key intermediates in drug molecules)
  • Stereoselective reductions and alkylation of amines
  • Reduction of imines, enamines, and aldehyde-bisulfite adducts
  • Organic synthesis in medicinal chemistry, process development, and academic research

STAB is especially preferred in pharmaceutical manufacturing for its mildness, broad substrate scope, and operational simplicity in large-scale reductive aminations.

Benefits

  • High selectivity for iminium ions over carbonyl groups
  • Mild reaction conditions (room temperature, no strong acids/bases required)
  • No toxic cyanide release (safer alternative to sodium cyanoborohydride)
  • Excellent yields in direct reductive amination protocols
  • Moisture-sensitive but stable under dry conditions

Frequently Asked Questions (FAQs)

What is Sodium triacetoxyborohydride mainly used for?

It is primarily used as a selective reducing agent for reductive amination reactions, converting aldehydes/ketones and amines into amines in a single step, widely applied in pharmaceutical and fine chemical synthesis.

Why is STAB preferred over sodium cyanoborohydride (NaBH₃CN)?

STAB avoids the generation of toxic cyanide byproducts, offers better selectivity for iminium reduction, and works well in aprotic solvents, making it safer and more environmentally friendly for many applications.

Can Sodium triacetoxyborohydride reduce ketones directly?

It reduces aldehydes effectively but is much slower with most ketones, which is why it excels in selective reductive amination where the iminium intermediate is reduced preferentially.

What solvents are compatible with STAB?

Common solvents include DCM, DCE, THF, dioxane, and toluene. It reacts with water and protic solvents like methanol, so anhydrous conditions are essential.

Is STAB suitable for large-scale synthesis?

Yes, its mild nature, high selectivity, and operational simplicity make it a go-to reagent in process chemistry and industrial-scale reductive aminations.

How should STAB be handled?

Handle under inert atmosphere (dry nitrogen/argon) to avoid moisture and air exposure, which can cause decomposition or violent reaction. Use in a fume hood with appropriate PPE.

Is high-purity STAB available for research or production?

Yes, ≥95–98% purity grades are standard for synthetic, medicinal chemistry, and scale-up applications.

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