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Practical tertiary phosphine ligand designed for modern palladium-free catalysis
Interest in palladium-free catalytic reactions has been steadily increasing in recent years, driven by cost-efficiency, sustainability and broad reaction applicability. At the same time, ligand design has become an increasingly important factor in achieving stable and highly reproducible results. In particular, combining high catalytic activity with ease of everyday handling remains a common challenge, from research and development through to process evaluation.
A newly developed tertiary phosphine ligand, Triisobutylenediphenylphosphine( TIBDPP), addresses these needs by integrating thoughtful molecular design with real-world usability.
TIBDPP is a ligand developed through a collaborative research programme between Fukuoka University and ENEOS Corporation. Based on academic insights into molecular design, it was conceived specifically for use in practical chemical processes.
The ligand is built on an alkyl framework derived from readily available triisobutylene and features a unique structure in which steric bulk is introduced at positions remote from the phosphorus atom. This design provides appropriate protection of the metal centre while retaining the flexibility required for efficient catalytic cycles.¹ Currently, TIBDPP is commercially manufactured and supplied by Hokko Chemical Industry, a Japanese fine chemical manufacturer founded in 1950, ensuring stable quality and reliable supply.
While palladium has traditionally been used as the catalyst for Suzuki – Miyaura cross-coupling reactions, one of the key advantages of TIBDPP is its ability to enable the use of nickel as an effective catalyst. TIBDPP also exhibits superior reactivity when compared with representative tertiary phosphine ligands previously reported for nickel-based systems.
In addition to its applicability to aryl bromide substrates, the ligand also delivers high yields with aryl chlorides, substrates that are generally regarded as challenging in nickel catalysis, within practical reaction times. These features suggest that TIBDPP can be broadly applied to the synthesis of biaryl structures that are important for pharmaceuticals, functional materials and agrochemical intermediates.
TIBDPP also exhibits distinctive properties as an organophosphorus compound. Unlike many conventional liquid phosphine ligands, it shows excellent air stability.
This stability facilitates routine operations such as weighing, charging and storage, contributing to improved reproducibility and reduced operational burden. As a result, TIBDPP can be smoothly introduced across a wide range of development stages, from initial reaction screening to process scale-up.
With its high catalytic activity, stable handling properties and reliable manufacturing and supply framework, TIBDPP exemplifies ligand design that places emphasis not only on performance but also on practical usability.
From laboratory-scale investigations to process development aimed at industrial implementation, TIBDPP is positioned as a compelling option for modern palladium-free crosscoupling chemistry. ●
Reference: 1: Org. Lett. 2025, 27, 49, 13432 – 13436
Hokko Chemical Industry Co., Ltd.
k + 81-3-3279-5142 j www. hokkochem. co. jp / english
20 SEP SPECIALITY / OCT 2026 CHEMICALS MAGAZINE ESTABLISHED 1981