Hello,
I've synthesized a few compounds with a hydroxamic acid moeity (C(=O)NHOH). The NHOH peaks should appear around 10.6 and 8.9 ppm.
The thing is, more than often I do not see these peaks in solvents considered non-exchangeable. To my knowledge I never see the peaks in CDCl3, I typically do in DMSO-d6 except on one occasion.
Does anyone have a good reason why I don't see these peaks in CDCl3 or DMSO-d6?