Figure 2
ESI mass spectrometry of the product in reaction (a) without L1HCl and reaction (b) with moderate L1HCl. For reaction (a), 1.62 g (TBA)4[Mo8O26] (0.75 mmol), 1.68 g aniline (18 mmol) and 4.13 g DCC (20 mmol) were dissolved in 30 mL anhydrous MeCN, then the solution was refluxing at 80 °C. After 12 h, 2 mL of the reaction solution was filtrated to remove the white precipitates of 1,3-dicyclohexylurea (DCU) and a black clear solution was obtained, and then the filtrate was poured into ether, resulting in precipitation, which was dissolved in 1 mL acetonitrile to obtain the ESI mass spectrometry, while for reaction (b), 1.49 g aniline (16 mmol) and 0.26 g L1HCl (2 mmol) was added into the reaction system instead.
