I've been working on a new methodology for the synthesis of Triazene (N=N-NH). As long as I use deuterated acetone, I can take a beautiful NMR whereas using CDCl3 gives me a messy NMR for the same sample. I know working with triazene is a bit tricky and can be decomposed in acidic medium. I know CDCl3 could be a bit acidic. However, most of the published reports used CDCl3 for taking NMR and a few cases d-DMSO. I couldn't find any paper using d-acetone and I think I might have some thing else in it. Considering that, my NMR using d-acetone completely makes sense.