“…The purified materials gave C, H, N microanalyses within ± 0.5 of the calculated values except for 1b (N 0.89), 1e (C 0.99) and 1f (C 0.55). Melting points were generally close to the literature values,16,21 and the 1 H NMR and IR spectra were in agreement with their structures. The ACN used in this work was HPLC grade, and Karl Fischer analysis showed that the water content (as a % by volume) in ACN for four samples from different batches was 0.058, 0.048, 0.122 and 0.099.…”