Preparation of Sodium Triacetoxyborohydride

Preparation of Sodium Triacetoxyborohydride. Preparation
from sodium borohydride in situ prior to reduction is
our preferred method. To NaBH4 (74 mg), suspended in ethyl
acetate (15 mL) and cooled with an ice-water bath, was added
glacial acetic acid (3.05 equiv) by syringe over approx. 5 min. Stirring
was continued for another 5 min until a clear solution was
formed. The solution [...]