Synthesis and redox behavior of 1-azulenyl sulfides and efficient synthesis of 1,1′-biazulenes
The reaction of azulenes with several sulfoxides in the presence of acid anhydrides to afford the corresponding 1-azulenylsulfonium and 1,3-azulenediyldisulfonium ions is reported. The subsequent conversion of these ions in high yields into 1-azulenyl met