Abstract Reactions of tert-butyl tetraethylphosphorodiamidite with acetic and trifluoroacetic acids involve substitution of the amido group. This process was described by a scheme beginning with protonation of phosphorus and proved by modeling separate reaction stages. A probable scheme of the proposed reactions is described.
![diethylamino-[(2-methylpropan-2-yl)oxy]-oxophosphanium Structure](https://image.chemsrc.com/caspic/101/16391-02-9.png)
