Figure 4.
a) The NO3 −‐mediated transformation of 1 a–1 c into 2 a. b) X‐ray structure of 1 c.24 c) 1H NMR spectra (500 MHz, CD3CN) of i) 1 a–1 c and ii) the same mixture after heating for 24 h in the presence of NO3 − anions.
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