Tetrabutylurea

Tetrabutylurea (CAS 4559-86-8), commonly abbreviated as TBU, is a high-boiling polar aprotic solvent used across pharmaceutical, biotechnology, and industrial cleaning applications. It functions as a carrier and reaction medium where conventional solvents fall short in terms of thermal stability or solvating power. In pharmaceutical synthesis, TBU serves as a process solvent.

It is ideal for reactions requiring elevated temperatures and chemical inertness toward sensitive intermediates. Biotechnology workflows use it as a solubilizing carrier for difficult-to-dissolve compounds. Industrial and institutional cleaning formulations incorporate TBU to dissolve stubborn organic residues and polymer deposits. These residues often resist standard solvent systems used in the industry.

Its high boiling point also makes it suitable for use in high-temperature coating and specialty chemical processes. Solvent retention and stability are critical procurement considerations for these uses. Tetrabutylurea is supplied as a clear liquid in standard drum and IBC packaging suited for industrial volumes. It is available primarily in technical and high-purity grades for various needs.

Purity specifications are typically at 98% or above for synthesis-grade applications. Buyers sourcing for pharmaceutical or biotech use should confirm GMP-aligned documentation with their suppliers. Batch-level analytical data should be reviewed to ensure the material meets the necessary requirements. This ensures the solvent performs reliably in sensitive manufacturing and research environments.