A NEW AND EFFICIENT METHOD FOR THE PREPARATION OF BISMUTHONIUM AND TELLURONIUM SALTS USING ARYLBORONIC AND ALKENYLBORONIC ACIDS - FIRST OBSERVATION OF THE CHIRALITY AT BISMUTH IN AN ASYMMETRICAL BISMUTHONIUM SALT

Treatment of triarylbismuth difluorides with aryl- and alkenylboronic acids in the presence of BF3. OEt2 afforded tetraaryl- and alkenyltria rylbismuthonium tetrafluoroborates, respectively, while similar treatm ent of diphenyltellurinyl difluoride yielded the corresponding telluro nium salts. The chirality at bismuth was observed for the first time f rom the H-1 NMR spectrum of an asymmetrical bismuthonium salt.