Dimethylformamide - Wikipedia
https://en.wikipedia.org/wiki/DimethylformamideDimethylformamide forms 1:1 adducts with a variety of Lewis acids such as the soft acid I 2, and the hard acid phenol. It is classified as a hard Lewis base and its ECW model base parameters are E B = 2.19 and C B = 1.31. Its relative donor strength toward a series of acids, versus other Lewis bases, can be illustrated by C-B plots.