N,N-Dimethylaniline (DMA) was identified as a colorimetric titrant for accurate quantification of boron tribromide (BBr₃) solutions. The initial 1:1 DMA/BBr₃ Lewis acid–base adduct formed upon addition of the first equivalent of BBr₃ is bright blue in color. Addition of catalytic quantities of BBr₃ beyond the first equivalent initiates an instantaneous change in the solution from blue to yellow. This methodology will allow for accurate quantification of BBr₃ so that proper stoichiometric amounts of BBr₃ may be used to facilitate a broad range of organic transformations.

中文翻译：

---

快速比色滴定法定量三溴化硼

N，N-二甲基苯胺（DMA）被鉴定为比色滴定剂，用于准确定量三溴化硼（BBr ₃）溶液。在加入第一当量的BBr _3时形成的最初的1：1 DMA / BBr ₃ Lewis酸碱加成物是亮蓝色。超过第一当量的催化量的BBr ₃引发溶液从蓝色到黄色的瞬时变化。该方法学将允许对BBr ₃进行精确定量，以便可以使用适当的化学计量的BBr ₃来促进广泛的有机转化。