Synthesis and Structure of per‐Methylated B₆N₇‐Azaboraphenalene

Abstract

Tricyclic nonamethyl‐B6N7‐phenalene, Me9B6N7 (1) was prepared from N(BCl2)3 and MeB(NHMe2)2 in the presence of NEt3. Its B3N3 rings are twisted against each other by 8 and 11° and the B–N bond lengths vary from 1.412(9) to 1.482(9) Å. The tricyclic ring is rather stable as shown by its mass spectrum, which is dominated by the loss of Me groups as well as by the formation of doubly charged fragments of the tricycle. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

Boron, aluminium, gallium, indium and thallium

“…106 The tricyclic phenalene analogue, nonamethyl-B 6 N 7 -phenalene [Me 9 B 6 N 7 ], has been prepared from the reaction of N(BCl 2 ) 3 and MeB(NHMe 2 ) 2 in the presence of NEt 3 . 107 New boron containing two-photon absorbing fluorophores have been prepared, based around a central pyrazabole {N 4 B 2 } core. Various conjugated systems and end groups were investigated and their ability to modulate the physicochemical properties (alkoxy, diphenylamino, and boron dipyromethene groups) determined.…”

Selective dehydrogenation of ammonia borane to polycondensated BN rings catalysed by ruthenium olefin complexes

“…S16, ESI †) is consistent with the expected average nanosheet length of BN21. 37,38 For the formation of BN21, 21 ammonia borane molecules have been coupled leading to the release of 54 molecules of hydrogen. This corresponds theoretically to the evolution of 2.57 equivalents of hydrogen, which is in good agreement with the experimentally measured amount (183.0 mL, 2.52 equiv., TON = 84).…”