Borane tert-butylamine is an amine borane complex derived from tert-butylamine and borane. It is a colorless solid.
The compound is prepared by the reaction of tert-butylammonium chloride and sodium borohydride:
:t-BuNHCl  +  NaBH   →   t-BuNHBH  +  H  +  NaCl
In organic synthesis, borane tert-butylamine can be used for selective reduction of certain functional groups including aldehydes, ketones, oximes, and imines.
In photographic processing, it is used in the E-4 process, as "chemical enlighting" step in the processing of the film.