Controlled Photooxidation of Pyridinium Acylhydrazones to 1,3,4-Oxadiazoles by inclusion Complexation with Cucurbit[7]uril
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During the past decade, the cucurbit[n]urils (CB[n]) have been widely and intensively developed in various fields such as host-guest chemistry, molecular recognition, molecular assembly, catalysis. Here, we reported host-guest complexation of pyridinium acylhydrazones with cucurbit[7]uril (CB7). The binding mode and interactions of pyridinium acylhydrazone with CB7 were investigated by 1H NMR, UV-Vis, and computational calculation. Additionally, we presented photo-driven oxidative cyclization of pyridinium acylhydrazones to the 1,3,4-oxadiazoles with no additional additives. Lastly, the effect of inclusion complex formation of bis-pyridinium acylhydrazones (BH1) on the oxidative cyclization reaction was studied in the DMSO solution using CB7 as a host.