Synthesis and Reactivities of 1,5‐ and 1,7‐Azulenequinone Derivatives. A Highly Convenient, One‐Pot Synthesis of 3‐Bromo‐1,5‐ and −1,7‐Azulenequinones by Bromination of Azulene,

Abstract

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