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Tert-butyl hydroperoxide (TBHP) is an organic peroxide with the formula (CH₃)₃COOH.
It is a colorless liquid, commonly used as an oxidizing agent and a radical initiator in various chemical reactions, including polymerizations and epoxidations.
TBHP is valued for its relatively high stability compared to other organic peroxides but still requires careful handling due to its reactive and potentially explosive nature.
CAS Number: 75-91-2
Synonyms:
TBHP,2-Methyl-2-propyl hydroperoxide,tert-Butyl peroxide,t-Butyl hydroperoxide,2-Methyl-2-propylhydroperoxide,tert-Butyl hydroperoxide solution (when in aqueous or organic solvents),2-Methyl-2-propylperoxylic acid
Tert-butyl hydroperoxide (TBHP) is a widely utilized organic peroxide compound that serves as a potent oxidizing agent in both academic and industrial chemistry.
Its unique properties, including thermal stability and solubility in organic solvents, render it a valuable reagent for oxidation reactions, polymerizations, and other synthetic applications.
This article explores the chemical structure, synthesis routes, reactivity, applications, and safety protocols associated with TBHP.
Detailed discussions on its use in organic transformations, industrial processing, and analytical detection are presented, along with an overview of its toxicological profile and regulatory guidelines.
As industries move towards more sustainable and safer chemical practices, TBHP continues to be a focal point in the evolution of oxidation chemistry.
Introduction
Tert-butyl hydroperoxide (TBHP) is an organic compound with the molecular formula C4H10O2.
It exists as a clear, colorless liquid and is widely recognized for its role as an oxidizing agent in a variety of chemical reactions.
TBHP has garnered significant attention due to its versatility and efficacy in synthetic organic chemistry, especially in oxidation reactions and radical initiations.
The importance of TBHP is underscored by its role in processes ranging from laboratory-scale syntheses to large-scale industrial operations.
As an organic peroxide, TBHP provides a relatively safe alternative to other, more unstable peroxides, which can decompose violently under certain conditions.
Due to its favorable properties, TBHP has become indispensable in the preparation of epoxides, alcohols, ketones, and other functionalized compounds.
This article aims to provide a comprehensive review of TBHP, covering its chemistry, synthesis, reactivity, practical applications, safety considerations, and future prospects in green and sustainable chemistry.
Physical Properties
Molecular Weight: 90.12 g/mol
Appearance: Colorless liquid
Boiling Point: ~35-38°C (for aqueous solutions)
Density: 0.94 g/cm³ (at 20°C)
Solubility: Miscible with organic solvents such as alcohols, ethers, and hydrocarbons; limited solubility in water
Odor: Pungent, ether-like
Chemical Properties
Oxidizing Nature: TBHP is a strong oxidizer and can donate oxygen in redox reactions.
Thermal Stability: Relatively stable under controlled conditions; decomposes exothermically at elevated temperatures.
Reactivity: Reacts with nucleophiles, radicals, and transition metal catalysts; sensitive to acids and bases which can accelerate decomposition.
The unique balance between reactivity and stability makes TBHP suitable for controlled oxidation reactions in organic synthesis and industrial processes.
Synthesis and Production
Industrial Synthesis
Industrial production of TBHP typically involves the reaction of isobutane with oxygen under controlled conditions using a catalytic process:
(CH3)3CH + O2 → (CH3)3COOH
This oxidation reaction requires careful temperature and pressure control to minimize the formation of explosive peroxides or unwanted by-products.
Cobalt or manganese-based catalysts are often used to enhance the reaction rate and selectivity.
Laboratory Preparation
In the laboratory, TBHP can be synthesized by the acid-catalyzed reaction of tert-butyl alcohol with hydrogen peroxide:
(CH3)3COH + H2O2 → (CH3)3COOH + H2O
This method is useful for preparing small quantities and allows for good control over product purity. Commonly, this reaction is carried out in an aqueous or alcohol medium to stabilize the hydroperoxide formed.
Commercial Forms
TBHP is commercially available as aqueous solutions (typically 70%) or in organic solvents like decane.
These formulations enhance safety and shelf life, reducing the risk of explosive decomposition.
Reactivity and Mechanism
Radical Formation
TBHP readily undergoes homolytic cleavage of the O-O bond to form tert-butoxy and hydroxyl radicals under thermal or photochemical conditions:
(CH3)3COOH → (CH3)3CO• + •OH
These radicals initiate a variety of chain reactions, particularly in polymerization and oxidation.
Redox Behavior
TBHP acts as an electron acceptor in many organic reactions.
In the presence of transition metals such as iron, copper, or vanadium, TBHP undergoes catalytic decomposition to produce reactive oxygen species that drive oxidation processes.
Common Reaction Pathways
Epoxidation: Converts alkenes into epoxides
Hydroxylation: Introduces hydroxyl groups into aromatic or aliphatic substrates
Baeyer-Villiger Oxidation: Oxidizes ketones to esters or lactones
The mild reaction conditions and selectivity offered by TBHP-based oxidations are critical for their application in sensitive or complex organic molecules.
SAFETY INFORMATION ABOUT TERT-BUTYLHYDROPEROXIDE
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
