When should the use of TBAB be considered?

TBAB is a good candidate for screening when an ionic reagent, base, or nucleophile is in a different phase from the organic substrate, and the reaction progress may be limited by interphase transport.

How does TBAB behave after the reaction is complete, and how does it impact the plant's wastewater management?

TBAB has a high water solubility of 600 g/L at 20°C. The substance is not readily biodegradable; therefore, after phase separation, it does not decompose but transfers entirely into the aqueous phase. The presence of this quaternary ammonium salt in post-reaction wastewater elevates COD (Chemical Oxygen Demand) and TOC (Total Organic Carbon) levels, which must be accounted for when balancing these parameters at the plant's wastewater treatment facility.

What starting dose should be used for testing?

As a starting point for screening, the manufacturer recommends 3 mol% of TBAB relative to the limiting substrate or another key reagent. The dose should then be optimized by comparing the variant with TBAB against a reference process without a PTC (Phase-Transfer Catalyst).

TBAB – Phase-Transfer Catalyst

Basic parameters

INCI Name	Not applicable
Chemical name	Tetrabutylammonium Bromide (TBAB)
Purity	Guaranteed minimum assay: 99.0%
Type	Quaternary ammonium salt (tetraalkylammonium bromide)
Origin	Synthetic
Solubility in water	600 g/L at 20°C
Solubility in other solvents	Soluble in selected polar organic solvents; compatibility should be confirmed for the specific process system
CAS Number	1643-19-2
Form	Crystalline powder
Colour	White to off-white

Tetrabutylammonium Bromide with a minimum purity of 99.0%, suitable for screening and implementation in organic synthesis processes.

TBAB facilitates the transfer of anions between an aqueous or solid phase and an organic phase in processes where insufficient contact between reagents is the limiting factor.

Technical Parameters – TBAB

TBAB is a crystalline quaternary ammonium salt used as a phase-transfer catalyst in organic synthesis. Its structure combines an ionic tetrabutylammonium centre with four butyl groups, enabling it to facilitate the transfer of anions between an aqueous or solid phase and an organic phase.

The product may be considered for use in liquid–liquid and solid–liquid systems, particularly where an ionic reagent, base or nucleophile is present in a different phase from the organic substrate. However, its catalytic performance depends on the composition of the reaction system, the type of reagent, solvent, temperature, phase ratio and mixing intensity. The suitability of TBAB should therefore be verified experimentally under the specific process conditions.

Its high solubility in water facilitates its use in many multiphase systems, but also requires consideration of TBAB behaviour during phase separation, product purification and aqueous-phase treatment or disposal.

Certificates and approvals

A comprehensive set of documents is available for TBAB to support raw material qualification by R&D, Quality, Procurement and HSE departments.

Safety Data Sheet (SDS)

The current Safety Data Sheet (SDS), prepared in compliance with UK REACH, includes the hazard classification, guidelines for safe handling, storage, and transport, as well as DNEL and PNEC values. This document facilitates the development of appropriate Occupational Health and Safety (OHS) procedures and risk assessments for specific applications.

Guarantee of purity and batch consistency (CoA)

Every delivery is accompanied by an individual Certificate of Analysis (CoA) detailing the results for key parameters, including purity, moisture content, free amine content, free amine salts, sulfated ash, and melting range.

Application

Industry	Examples for use
Pharmacuticals	Process raw material used in the synthesis of intermediates and chemical substances, specifically when the ionic reagent, base, or nucleophile is in a different phase from the organic substrate.
Specialty chemicals	Phase-transfer catalyst in alkylation reactions, nucleophilic substitution, selected condensations, and other processes conducted in liquid-liquid or solid-liquid systems. Process additive in selected polymerization, polycondensation, and polymer modification reactions where the interphase transport of reagents is critical. Co-catalyst (or auxiliary catalyst) in selected systems where an ionic oxidant or reductant is present in a different phase from the organic substrate. Precursor for the synthesis of other tetrabutylammonium salts via anion exchange reactions
Agrochemicals	Co-catalyst in the synthesis of intermediates and substances used in the production of plant protection products (crop protection chemicals)

Typical application areas

Below, we present selected organic synthesis processes where TBAB can facilitate the transport of reagents between phases and improve reaction conditions:

Alkylations – facilitating contact between an anion or base and the organic alkylating agent.
Nucleophilic substitutions – transporting the nucleophile from the aqueous or solid phase into the organic phase.
Selected condensation reactions – supporting processes where interphase transfer is the limiting factor.
Selected oxidation and reduction reactions – improving the availability of the ionic reagent in the phase containing the organic substrate.
Salt metathesis – serving as a starting material for the synthesis of other tetrabutylammonium salts via anion exchange.
Synthesis of intermediates – process application in the production of specialty chemicals, pharmaceutical intermediates, agrochemicals, and polymers.

When should TBAB be considered?

TBAB may be a suitable candidate for screening when:

The process is conducted in a liquid-liquid or solid-liquid system.
The ionic reagent and organic substrate exhibit limited contact.
The reaction rate depends on mixing intensity or phase ratio.
There is a need to shorten the reaction time or improve reagent utilization.
The feasibility of conducting the process under milder conditions is being evaluated

The effectiveness of using TBAB depends on the type of reagent, solvent, temperature, pH, phase ratio, and mixing intensity. The suitability of the catalyst must be verified on a case-by-case basis under the specific reaction conditions, evaluating not only the conversion but also selectivity, phase separation, and the product purification method.

Post-reaction behavior

TBAB exhibits high water solubility (600 g/L at 20°C) and is not readily biodegradable. For this reason, during implementation, its potential impact on the aqueous phase, COD/TOC parameters, salinity, and wastewater management must be considered. However, the actual partitioning of TBAB between phases depends on the composition of the specific system and should be confirmed experimentally.

Available packing

paper bag with PE liner 25 kg

TBAB from MEDICOS – supply stability and boutique support for your production

We supply technically pure tetrabutylammonium bromide (TBAB) to manufacturers seeking absolute parameter consistency in every delivered batch. We understand the realities of production—a lack of supplier stability causes downtime on synthesis lines and forces schedule changes. By partnering with MEDICOS, you eliminate this operational risk. We proactively manage inventory by planning upcoming deliveries in advance and verifying your projected consumption, which guarantees full logistical continuity without the risk of sudden stockouts.

Regulatory support and seamless QA audits

We supply the TBAB raw material along with a complete set of technical documentation and Certificates of Analysis (CoA), confirming strict purity parameters for every batch. The comprehensive raw material dossier includes UK REACH registration and a Safety Data Sheet (SDS). This streamlines the work of Quality Assurance (QA) and Regulatory Affairs (RA) departments, guaranteeing full formal compliance during audits.

Downloadable materials

Detailed technical and regulatory documentation for the product is available from MEDICOS on request. To receive it, please send us an e-mail. We will send you a complete set of current quality and regulatory documents.

Additional information

How to improve interphase transport? Phase-transfer catalysis (PTC) in laboratory and industrial practice

In organic synthesis conducted in multiphase systems, one of the factors limiting the reaction rate can be insufficient contact between reagents. When an ionic reagent, base, or nucleophile is located in the aqueous or solid phase, while the substrate is in the organic phase, the course of the process may depend on the efficiency of mass transfer across the phase boundary.

One method to improve reagent contact is the application of a phase-transfer catalyst. TBAB, or tetrabutylammonium bromide, is a classic quaternary ammonium salt utilized as a PTC in liquid-liquid and solid-liquid systems. However, its suitability depends on the type of reagents, solvent, temperature, phase ratio, and mixing intensity

Kinetics under control: the mechanism of action of TBAB

The TBAB molecule consists of a tetrabutylammonium cation and a bromide anion. The cation features four n-butyl groups, which enhance the compatibility of the resulting ion pairs with the organic environment.

In practice, the tetrabutylammonium cation can form an ion pair with an anion present in the aqueous or solid phase, facilitating its transport into the organic phase or the interphase region. If the process is limited by the availability of the ionic reagent, the application of TBAB can influence the reaction rate, conversion, or operating conditions.

However, this does not mean that TBAB will automatically improve every multiphase process. The catalytic effect must be confirmed experimentally for the specific reaction.

Controlled quality profile

In laboratory work and when scaling processes to pilot-plant conditions, the physicochemical stability of the reagents used plays a crucial role. TBAB is characterized by a stable structure and a narrow melting range of 102-104°C (which, for certified production batches, translates to an actual analytical result of 101.8-102.5°C). This guarantees stable catalytic behavior across a wide spectrum of process temperatures.

A raw material purity of at least 99.0% (reaching up to 99.93% in delivered batches) and strict impurity limits eliminate unforeseen interactions in the reaction environment. The complete absence of free amines (nil) and minimal moisture content (at a level of 0.10% against a specification limit of max. 0.5%) protect sensitive synthesis components from uncontrolled hydrolysis or catalyst deactivation.

Industrial-scale implementation and wastewater balance

When implementing TBAB into an industrial process, it is essential to consider not only its impact on reaction kinetics but also the subsequent phase separation, product purification, and waste stream management.

TBAB exhibits high water solubility, reaching 600 g/L at 20°C. The Safety Data Sheet (SDS) also indicates that the substance is not readily biodegradable.

However, this does not mean that TBAB will entirely partition into the aqueous phase in every process. Its actual partitioning depends on several factors, including:

the type of solvent,
salt concentration,
temperature,
the phase ratio,
the presence of the product and other mixture components.

During scale-up, it is therefore advisable to evaluate the content of TBAB or bromides in individual phases, its impact on phase separation, wash water consumption, and the COD (Chemical Oxygen Demand) and TOC (Total Organic Carbon) parameters.

More info

More information is available in the technical specifications of the product and in the safety data sheet available at this address (e-mail): kontakt@medicos.com.pl

TBAB (Tetrabutylammonium Bromide)

INCI name: Not applicable

CAS number: 1643-19-2

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Frequently asked questions about TBAB

Introducing a new raw material into synthesis processes requires an immediate and accurate risk assessment. Instead of losing time searching for data in Safety Data Sheets (SDS), here you will find answers to the questions we hear every day at MEDICOS.

TBAB is a good candidate for screening when an ionic reagent, base, or nucleophile is in a different phase from the organic substrate, and the reaction progress may be limited by interphase transport.
No. The effect depends on factors such as the type of anion, solvent, temperature, phase ratio, and mixing intensity. The suitability of the catalyst must be confirmed under the specific reaction conditions.
TBAB has a high water solubility of 600 g/L at 20°C. The substance is not readily biodegradable; therefore, after phase separation, it does not decompose but transfers entirely into the aqueous phase. The presence of this quaternary ammonium salt in post-reaction wastewater elevates COD (Chemical Oxygen Demand) and TOC (Total Organic Carbon) levels, which must be accounted for when balancing these parameters at the plant's wastewater treatment facility.
As a starting point for screening, the manufacturer recommends 3 mol% of TBAB relative to the limiting substrate or another key reagent. The dose should then be optimized by comparing the variant with TBAB against a reference process without a PTC (Phase-Transfer Catalyst).