References
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- Two signals for the indole NH were observed (δ 5.8 and 8.5 ppm) in a 2:3 ratio in the 1H-NMR spectrum of the formamidine.
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- In the cases of the hydrochloride salts (4 and 7), the DMF-DMA was first removed, then the resulting solid worked up from ether-water.
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- In some cases (e.g., entries 2 and 5 in Table) 2M NaOH was used instead of water.