Efficient synthesis of an unsupported aryl substituted iminoborane chain (HNArBH)NAr (Ar = [1,1′-biphenyl]-2-yl)

The reaction of 2-aminobiphenyl ArNH 2 with triethylamine borane (Et 3 NBH 3 ) at 165 °C, about 40 °C lower in temperature than that used for borazine synthesis, gives a linear HArN-BH-NAr-BH-NArH (Ar = [1,1'-biphenyl]-2-yl) chain in good yield (57%). This BN oligomer could be characterized by single crystal X-ray crystallography. The reaction of 2-aminobiphenyl ArNH 2 with triethylamine borane (Et 3 NBH 3 ) at 165 °C, about 40 °C lower temperature than that used for borazine synthesis, gives a linear HArN-BH-NAr-BH-NArH chain in good yield (57%).