11B COSY

Many NMR users are very familiar with the ¹H COSY experiment. It is used extensively by organic chemists. Many people do not realize that the COSY method can be used for many other abundant isotopes as well. The figure below shows the ¹¹B COSY spectrum of ortho-carborane. The data were collected with ¹H decoupling and allow the complete assignment of the ¹¹B NMR spectrum. Note that in this case, the ¹¹B - ¹¹B J couplings are unresolved in the 1D spectrum. Thank you to Dominique Duguay for providing the sample for the figure.