Synthesis and Properties of 6-Methoxy- and 6-Dimethylamino-1-methylthio- and 1,3-Bis(methylthio)azulenes and Triflic Anhydride-Mediated Synthesis of Their Biaryl Derivatives.

The synthesis of 1-methylthio- and 1,3-bis(methylthio)azulenes with an electron-donating group at the 6-position as well as their transformation into the corresponding novel 1,1′-bisazulene derivatives [cf.