Pentafluorphenylbor‐[p‐methoxy‐phenylimid], C6F5B  NC6H4OCH3 (1), reagiert mit Phenylacetylen zu 6‐Methoxy‐4‐phenyl‐2‐pentafluorphenyl‐2.1‐borazaronaphthalin (6‐Methoxy‐4‐phenyl‐2‐pentafluorphenyl‐1.2‐benzazaborin) (2). Das gleiche Produkt entsteht erwartungsgemäß auch, wenn man die zur Bereitung von 1 nötige thermische Abspaltung von HCl aus C6F5B(NHC6H4OCH3)Cl in Gegenwart von Phenylacetylen ausführt. Bei Zusatz von Triäthylamin erhält man nicht 2, sondern unter Substitution von Chlorid am Boramidchlorid durch die Phenylacetylid‐Gruppe das zu 2 isomere Pentafluorphenylborphenylacetylid‐p‐anisidid, C6F5B(C2C6H5)(NHC6H4OCH3) (6). Aus vier Arylboridchlorid‐Arylaminen Ar′BCl2 · H2NAr, bei denen die entsprechenden Borimide nicht bekannt sind, wurden in Gegenwart von Phenylacetylen 2 Mol HCl abgespalten und dabei in guten Ausbeuten entsprechende 2.1‐Borazaronaphthaline (1.2‐Benzazaborine) (7–10) erhalten.

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Addition of 3 equivalents of KH . BEt3 to [Me,NH] followed by addition of one equivalent of SnClz or Sb13 affords the stanna-sila-closo-borate( 1 -) 3 and stiba-sila-closo-borane 4, respectively. [MePh3P] . 3 crystallizes in the orthorhombic space group P212121.Recently, we reported on the nucleophilic degradation of o-silaborane"]. The pentagonal open face of the resulting nido-silaborate comprises a silicon atom and two B-B edges bridged by hyrogen atoms. This compound is a promising reagent for the syntheses of heterosilaboranes. The incorporation of group-14 and -15 elements into the skeleton of carboranes and boranes was reported for C2B9H13[*1, BI 1H1413], C2B4HJ4J and CBloH;3[5'6,71 leading to the expected cioso-clusters. In this paper we describe the preparation of EMeSiBloHlo hetero-sila-closo-borane clusters by using the MeSiBIoHl2 anion.The reaction of [Me3NH] [MeSiBloH12] (1) with 3 equivalents of KH . BEt, followed by the addition of one equivalent of SnCl, or Sb13 yielded the hetero-sila-closo-boranes 3, 4. r 1 r 1 c J 1 2 b : THF, SnCI, / Sbl,, -78 'C 3 : E = Sn , n = 1

Die bei der thermischen Abspaltung von 2 Mol Halogenwasserstoff aus Boran-Aminen RBHal2 .H2NR gebildeten Borimide R B -N R reagieren mit 3.4-Dihydro-isochinolin-Nphenylimin (1) als 1.3-dipolarem Agens zu den entsprechenden 3-Bora-1.2.4-triazolidinen (Hexahydro-l.2.4.3-triazaborolo[5.1-a]isochinolinen) (2-5).

Phosphanes P(NHX)3, which are usually unstable, were prepared as ligands in the complexes (CO)5MoP(NHX)3 (X = H, Me, i-Pr, Ph, PhNH) (2-6) by reactions of (CO)5MoPCl3 with ammonia, primary amines, and Phenylhydrazine. Attempts to prepare (CO)5MoP(NH-t-Bu)3 were unsuccessful: however, (CO)5MoPCl3 reacts with an excess of t-BuNH2 under similar conditions to give (CO)5MoNH2-t-Bu (7) and (CO)5Mo[P(NH-t-Bu)N2-Bu]2 (8). The diazadiphosphetidin complex 8, in which the metal is bound to phosphorus, can also be prepared directly by UV-irridation of a THF solution of Mo(CO)6 and the free ligand.