1,2‐Bis(diisopropylamino)‐1,2‐dihydro‐1,2‐benzodiboret ‐ ein erstes thermisch stabiles 1,2‐Dihydro‐1,2‐diboret

1,2‐Bis(diisopropylamino)‐1,2‐dihydro‐1,2‐benzodiborete ‐ A First Thermally Stable 1,2‐Dihydro‐1,2‐diborete * The synthesis of 1,2‐bis(diisopropylamino)‐1,2‐dihydro‐1,2‐benzodiborete ( 7 ) suceeds in good yield by a twofold ipso ‐borylation of 1,2‐bis(trimethylsilyl)benzene to give 3 , double amination to afford 4 and subsequent coupling with sodium/potassium alloy. Crystalline 7 is thermally stable; an X‐ray crystallographic structure determination has been carried out. In concentrated solution reaction of 4 with sodium/potassium alloy predominantly leads to the formation of the tetraborocine 6 by dimerization. In the presence of (phthalocyaninato)palladium as catalyst 7 reacts with 2 equivalents of dimethylacetylenedicarboxylate to give the benzo‐annulated diborocine 12.