Figure 3

⁷⁷Se MAS NMR spectra of PhSeO₂H 2 obtained by different pulse sequences. (a) Single pulse (SP); (b) High power ¹H decoupling (HPHD); (c, c′) Cross polarization (CP), 1200 scans and the spinning speed of 8 kHz or 10 kHz. The isotropic peak is labeled with an asterisk (*).