A very convenient, one-pot synthesis (over 80% yield) of 3-bromo-I,5-and -1,7-azulenequinones has been developed by bromination of azulene in aqueous tetrahydrofuran. Reduction of 3-bromo-l ,5-and -1,7-azulenequinones with tin or zinc powder in acetic acid gave the parent 1,5and 1,7-azulenequinones, and further reduction products.
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