The reaction o f appropriate amounts of BH3 with diazadiboretidines (RBNtBu), (la-e; R = Et, Pr, Bu, tBu, tBu(Me3Si)(4), or into an acyclic product RBH-NtBu-BH-NtBu-BHR (2e). The structure of 3c is characterized by a planar N2B3 ring skeleton with an unsymmetrical double-hydrogen bridge. RESULTSThe diazadiboretidines la-c [ 1-41 readily react with the borane thf . BH3 in a 1 : 1 ratio to give the five-1042-7163/90/$3.50 + .25 a Numbers in parentheses are estimated standard deviations in the least significant digit.
Aza‐arachno‐heptaboranes, a Novel Class of Azaboranes In the presence of 2,6‐lutidine (Lu), iminoboranes RBNR′ (1a–c, R/R′ = iPr/tBu, tBu/tBu,tBu/SiMe3) are added to B5H9 to give [LuH][R′NB6H8R] (2a–c). A monocapped trigonal prism for the arachno‐NB6 skeleton of 2a–c is deduced from 11B‐NMR data.
Reactions of the Boron Hydrides B3H7 and B5H9 with the Unsaturated Boron-Nitrogen Compounds NBtBu, and NB,tBu3THF . B3H7 reacts with RB 3 NR (1, R = tBu) to yield the p-iminoborane 1 reacts with B,Hg in the presence of lutidine (L) amino-diborane(6) B2H4R(NHR) (5), which crystallizes in the to give the ionic product [L -BR = NHR][B9HI4] (7); our earlier triclinic space group Pi. The reaction of B3H7 with the aza-report on the formation of the aza-arachno-heptaborate diboriridine NBztBu3 (2, R = tBu) leads to the known NBzR3 . [LH][NB6HsR2] has to be revised. The products from the re-BH3 (4) and the novel (NBZR3)2BZH4 (6). Product 6 is consid-action of B,H9 with NB2R3 are 4 and 6. ered to represent a diaza-arachno-octaborane derivative. The Uber den ungesattigten Charakter der Alkyl(alky1imino)-borane RB = NR, allen voran des bei Kuhlung lagerfahigen, kristallstrukturanalytisch charakterisierten tert-Butyl-Derivats (1, R = tBu), haben wir zusammenfassend berichtet"]. Auch die Bor-Stickstoffverbindung Tri-tert-butylazadiboriridin NB2R3 (2, R=tBu) erwies sich trotz der sterischen Abschirmung der drei Ringatome als unerwartet reaktionsfreudigc2I. Mit dem Boran BH, setzen sich sowohll als auch 2 zu Bor-Stickstoff-Verbindungen um, die man als kleinere Vertreter der Azaboran-Cluster-Familie ansehen kann, namlich zu Derivaten von arachno-Diazapentaboran (7)
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