TRI-SEC-BUTYLBORANE

Tri-sec-butylborane is a colorless to pale yellow liquid under standard conditions and is highly pyrophoric, meaning it can ignite spontaneously upon contact with air, which makes it extremely reactive and hazardous to handle.
Tri-sec-butylborane is classified as a trialkylborane, a type of organoborane where the boron atom is covalently bound to three alkyl groups.
Tri-sec-butylborane is notable for its high nucleophilicity and strong reducing ability, which makes it a powerful reagent in organic synthesis, particularly for initiating radical polymerizations, hydroboration reactions, and selective reductions. 

CAS Number: 1113-78-6
Molecular Formula: C12H27B
Molecular Weight: 182.15
EINECS Number: 214-209-1

Synonyms:Tri-sec-butylborane, 1113-78-6, Tris(1-methylpropyl)borane, Borane, tris(1-methylpropyl)-, EINECS 214-209-1, DTXSID30883646, RefChem:569835, DTXCID60824825, 214-209-1, tri(butan-2-yl)borane, tri-s-butylboron, tri-sec-butylboron, tri-s-butyl-borane, tri-sec butylborane, tris(butan-2-yl)borane, SCHEMBL332719, AKOS015918439, DB-040969, NS00045054, TRI-SEC-BUTYLBORANE;tri-sec-butylborane,tsbb;Tri-sec-butylborane solution;TRI-SEC-BUTYLBORANE, 1.0M SOLUTION IN TE TRAHYDROFURAN;Tri-sec-butyL;Tri(1-methylpropyl)borane;Tris(1-methylpropyl)borane;Tris(sec-butyl)borane

Tri-sec-butylborane is the organoboron compound with the formula KBH(C4H9)3. 
Tri-sec-butylborane is the potassium salt of tri(sec-butyl)borohydride. 
Tri-sec-butylborane is sold as solution in THF. 

Tri-sec-butylborane is a strong reducing agent. 
Solutions are pyrophoric and highly reactive toward water and protic compounds. 
Tri-sec-butylborane is handled using air-free technique. 

Tri-sec-butylborane is produced by the reaction of tri(sec-butyl)borane with potassium hydride. 
The reagent is used to reduce ketones to alcohols.
Tri-sec-butylborane, often abbreviated as TSBB, is an organoborane compound with the chemical formula C₁₂H₂₇B, consisting of a central boron atom bonded to three secondary butyl groups (–CH(CH₃)CH₂CH₃). 

The secondary butyl groups provide steric bulk, which can influence the selectivity and reactivity of the compound in chemical transformations. 
Tri-sec-butylborane is less volatile than smaller trialkylboranes, such as triethylborane, but its extreme air and moisture sensitivity requires that it be stored and handled under inert atmospheres, typically in argon or nitrogen, to prevent accidental ignition or decomposition.
Tri-sec-butylborane reacts readily with oxygen, water, and peroxides, producing boron oxides and flammable hydrogen gas. 

Tri-sec-butylboranes reactivity is exploited in controlled radical reactions, such as initiating polymerization of monomers like styrene and methyl methacrylate, where it serves as a highly efficient radical initiator. 
In addition, it can participate in hydroboration reactions, adding across carbon-carbon multiple bonds to form organoboron intermediates, which can then be converted to alcohols, amines, or other functional groups.

From an industrial and laboratory perspective, Tri-sec-butylborane is valued for its ability to initiate reactions at low temperatures and provide highly selective transformations, particularly in the synthesis of complex organic molecules and polymers. 
Its combination of strong reducing power, steric control, and radical initiation capability makes it a key reagent in specialty chemical synthesis, pharmaceutical intermediates, and polymer chemistry.
Due to its extreme pyrophoricity and toxicity, tri-sec-butylborane is handled only by trained personnel using rigorous safety protocols, including air-free techniques, proper shielding, and fire suppression systems. 

Accidental exposure to air or moisture can lead to violent ignition, chemical burns, and the release of toxic gases, which makes awareness of its hazards and adherence to safety measures critical in any setting.
Tri-sec-butylborane is primarily used in organic synthesis as a reagent for hydroboration reactions. 
Tri-sec-butylborane facilitates the addition of boron and hydrogen across double bonds in alkenes, forming organoborane intermediates. 

These intermediates are valuable in further transformations, such as oxidation to produce alcohols or coupling reactions to create carbon-carbon bonds. 
Its selectivity and efficiency make it a useful tool in the synthesis of complex organic molecules, particularly in pharmaceuticals and fine chemicals. 
Additionally, it is employed in polymer chemistry to initiate polymerization processes, contributing to the production of specialized polymeric materials.

Boiling point: 80-81 °C(Press: 12 Torr)
Density: 0.799 g/mL at 25 °C
Flash point: 1 °F
InChIKey: YUPAWYWJNZDARM-UHFFFAOYSA-N

Tri-sec-butylborane is a highly reactive organoboron compound in which a single boron atom is covalently bonded to three secondary butyl groups. 
Its chemical structure imparts significant steric hindrance around the boron center, which influences both its reactivity and selectivity in chemical reactions. 
Unlike smaller trialkylboranes, the bulkiness of the sec-butyl groups slows certain reactions but also provides greater control in stereoselective processes, making it particularly valuable in fine chemical synthesis and laboratory research.

Tri-sec-butylborane is typically a clear to pale yellow liquid with a low viscosity, but it is extremely pyrophoric, igniting spontaneously in air at room temperature. 
This property makes it a highly energetic reagent, capable of reacting violently with oxygen, water, or other oxidizing agents. 
Because of this, it is always handled under inert atmospheres such as nitrogen or argon, often in specialized glassware or stainless steel apparatus designed to prevent accidental exposure to air. 

Tri-sec-butylboranes boiling point is relatively moderate, but the pyrophoricity and reactivity necessitate careful temperature control during storage and use.
Tri-sec-butylborane is widely used as a radical initiator in polymer chemistry due to its ability to generate radicals at low temperatures, allowing polymerizations to proceed under milder and more controlled conditions. 
It also functions as a hydroboration reagent, adding across alkenes and alkynes to form organoboron intermediates, which can be subsequently converted into alcohols, amines, or other functionalized molecules. 

Tri-sec-butylboranes strong reducing properties make it useful for selective reductions, where it can reduce unsaturated bonds or specific functional groups without affecting more stable parts of the molecule.
In practical terms, tri-sec-butylborane is considered an extremely hazardous chemical, requiring rigorous safety protocols, specialized storage containers, and trained personnel. Its combination of air- and moisture-sensitivity, pyrophoricity, and strong reducing power makes it both highly useful and highly dangerous, demanding that all handling occur in controlled laboratory or industrial environments. 
Its applications are therefore largely limited to professional chemical laboratories, specialty chemical production, and polymer research rather than general industrial or consumer use.

Tri-sec-butylborane is a versatile, highly reactive organoboron reagent whose steric bulk, pyrophoric nature, and strong reducing capabilities make it indispensable in certain chemical syntheses, but also extremely hazardous without strict safety measures. 
Its controlled reactivity and radical-generating ability provide chemists with unique opportunities for precise transformations that are difficult to achieve with less reactive or smaller boron compounds.
Tri-sec-butylborane is a highly specialized organoboron compound in which a single boron atom is bound to three secondary butyl groups, giving it the molecular formula C₁₂H₂₇B.

The secondary butyl substituents create considerable steric hindrance around the boron center, which slows certain unwanted side reactions while enhancing selectivity in targeted chemical processes. 
This steric effect is particularly useful in stereoselective hydroboration reactions, where the compound can deliver boron to specific positions on an unsaturated carbon-carbon bond, yielding highly controlled products that are difficult to achieve with smaller, less hindered trialkylboranes.
Tri-sec-butylborane is a colorless to pale yellow liquid that is extremely pyrophoric, meaning it ignites spontaneously upon exposure to air. 

Tri-sec-butylborane is also highly sensitive to moisture, reacting with water to produce hydrogen gas and boric byproducts, which can pose additional fire and explosion hazards. 
Because of these properties, it is stored and handled under inert atmospheres, typically using argon or nitrogen, in airtight containers or specialized Schlenk-type glassware.
The combination of air sensitivity and volatility requires that all transfers, dilutions, and reactions be carried out in a controlled, oxygen-free environment, often in glove boxes or with rigorously purged reaction vessels.

Uses:
Tri-sec-butylborane is widely used in the polymer industry as a highly efficient radical initiator, where its ability to generate free radicals at low temperatures allows for precise control over polymerization reactions. 
For example, it is used to initiate polymerization of vinyl monomers such as styrene, methyl methacrylate, and acrylates, providing polymers with uniform molecular weight distribution and controlled chain architecture. 
Tri-sec-butylboranes high reactivity and low-temperature initiation make it particularly suitable for sensitive or temperature-sensitive monomers, where conventional initiators might cause unwanted side reactions or degradation.

Tri-sec-butylborane is extensively used as a hydroboration reagent, adding across carbon-carbon double or triple bonds to form organoboron intermediates. 
These intermediates can then be oxidized to alcohols, converted to amines, or functionalized in other ways, making TSBB a crucial reagent in organic synthesis and fine chemical production. 
Its steric bulk from the secondary butyl groups provides selectivity, allowing chemists to target specific positions on unsaturated molecules, which is especially important in stereoselective synthesis of complex molecules.

Due to its strong reducing ability, tri-sec-butylborane is used in selective reductions of functional groups. 
It can reduce aldehydes, ketones, or other unsaturated compounds under controlled conditions without affecting other parts of the molecule, which makes it valuable in complex molecule synthesis and pharmaceutical intermediate preparation. 
Tri-sec-butylboranes ability to provide selective reactivity with high efficiency allows for clean transformations with minimal byproducts, improving overall yield and process efficiency.

Tri-sec-butylborane serves as an important reagent in the synthesis of specialized organic compounds and boron-containing intermediates. 
Tri-sec-butylborane is employed in laboratories and industrial settings to create organoboron compounds that are subsequently used in cross-coupling reactions, boron-mediated transformations, and advanced materials synthesis. 
Its combination of reactivity, steric control, and radical initiation ability enables chemists to perform reactions that are difficult to achieve with other trialkylboranes or conventional reagents.

In academic and research laboratories, Tri-sec-butylborane is valued for its ability to facilitate controlled radical reactions, stereoselective hydroboration, and low-temperature transformations. 
Researchers use it to study reaction mechanisms, polymerization kinetics, and novel synthetic pathways, where its unique chemical properties provide insights and allow experimentation with highly reactive organoboron chemistry.
Beyond polymerization and organic synthesis, tri-sec-butylborane may be used in small-scale specialty manufacturing, such as producing fine chemicals, pharmaceutical intermediates, and boron-containing materials. 

Tri-sec-butylboranes air- and moisture-sensitive nature limits its large-scale industrial use, but in controlled environments, it serves as a powerful tool for high-precision chemical transformations.
Tri-sec-butylborane is extensively used as a highly efficient radical initiator in polymer chemistry, particularly because it can generate free radicals at extremely low temperatures. 
This property allows polymerizations to be carried out under mild conditions, minimizing side reactions and degradation of sensitive monomers such as styrene, vinyl acetate, acrylates, and methacrylates. 

The radicals produced initiate chain reactions that result in polymers with controlled molecular weights, narrow polydispersity, and desired chain architectures. 
Tri-sec-butylboranes ability to precisely control polymerization makes it especially valuable in producing specialty polymers for coatings, adhesives, and high-performance materials.
The steric bulk of the secondary butyl groups in tri-sec-butylborane makes it a highly selective hydroboration reagent, allowing chemists to target specific carbon atoms in alkenes and alkynes. 

This selectivity is particularly important in stereoselective organic synthesis, where the orientation of functional groups can dramatically affect the biological or physical properties of the resulting molecule. 
The organoboron intermediates formed can subsequently be converted into alcohols, amines, or other functional derivatives, enabling the construction of complex molecules such as pharmaceuticals, agrochemicals, and fine chemicals.

Tri-sec-butylborane is also used as a powerful, selective reducing agent for organic compounds, capable of reducing ketones, aldehydes, and unsaturated bonds without affecting other sensitive functionalities. 
This allows chemists to perform site-specific reductions in multi-functional molecules, which is particularly important in the synthesis of drug intermediates, natural products, and high-value specialty chemicals. 
Its steric hindrance minimizes over-reduction or unwanted side reactions, providing clean, high-yield transformations.

Safety Profile:
Tri-sec-butylborane is extremely pyrophoric, meaning it can ignite spontaneously upon contact with air, even at room temperature. 
Exposure to oxygen can lead to instantaneous combustion, producing flames, intense heat, and smoke, which makes handling and storage particularly dangerous. 
Because of this, Tri-sec-butylborane is never handled in open air and must be manipulated under inert atmospheres such as argon or nitrogen using specialized air-free techniques, glove boxes, or Schlenk lines.

Tri-sec-butylborane reacts violently with water or moisture, producing hydrogen gas and boron-containing byproducts. 
The reaction can be exothermic and lead to fire or explosion if the hydrogen ignites. 
Even traces of moisture in solvents, containers, or reaction vessels can trigger a hazardous reaction, requiring strict dry handling procedures and moisture-free storage.

Beyond spontaneous ignition in air, Tri-sec-butylborane is highly flammable, and its vapors can form explosive mixtures with air. 
In the event of a fire, combustion can produce toxic gases, including boron oxides, hydrocarbons, and smoke, which are harmful if inhaled. 
Fires involving Tri-sec-butylborane are extremely difficult to extinguish using standard water-based methods due to violent reactions with water; dry chemical, foam, or inert gas fire suppression systems are required.