Tetra-n-butylammonium hydroxide, 40% w/w aq. solution is used as a phase-transfer catalyst in organic synthesis especially for alkylation and condensation reactions. It is used as a curing accelerator for epoxy resins. It is also used in preparation of dichlorocarbene from chloroform.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.