Reactions of the aluminum(I) monomer LAl [L = HC{(CMe)(NAr)}(2); Ar=2,6-iPr(2)C(6)H(3)]with imidazol-2-ylidene and diphenyldiazomethane. A hydrogen transfer from the L ligand to the central aluminum atom and formation of the diiminylaluminum compound LAl(N=CPh2)(2)

The solid-state reaction of LAl and imidazol-2-ylidene at elevated temperature (120 degreesC) yielded the aluminum monohydride N-heterocyclic carbene adduct [(HC[C(CH2)NAr] (CMeNAr)}AIH-(CN(R)C2Me2N(R)}] [R = iPr (1), Me (2)]. Compounds 1 and 2 have been characterized by spectroscopic (IR, and H-1 a...

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Published inEuropean journal of inorganic chemistry no. 20; pp. 4046 - 4051
Main Authors Zhu, HP, Chai, JF, Stasch, A, Roesky, HW, Blunck, T, Vidovic, D, Magull, J, Schmidt, HG, Noltemeyer, M
Format Journal Article
LanguageEnglish
Published WEINHEIM Wiley 18.10.2004
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Summary:The solid-state reaction of LAl and imidazol-2-ylidene at elevated temperature (120 degreesC) yielded the aluminum monohydride N-heterocyclic carbene adduct [(HC[C(CH2)NAr] (CMeNAr)}AIH-(CN(R)C2Me2N(R)}] [R = iPr (1), Me (2)]. Compounds 1 and 2 have been characterized by spectroscopic (IR, and H-1 and C-13 NMR), mass spectrometric, and elemental analyses, and I was further characterized by Xray structural analysis. These experimental data indicate that the AI-H bond is formed by hydrogen migration from one of the methyl groups of the beta-diketiminato ligand backbone. The reaction of LAl with two equivalents of diphenyldiazomethane afforded the diiminylaluminum compound LAl(N= CPh2)(2) (3), while an excess of diphenyldiazomethane resulted in the formation of Ph2C=N-N=CPh2. This suggests that Ph2C=N-N=CPh2 is initially generated and then reacts further by oxidative addition to yield 3. The X-ray structural analysis reveals that compound 3 contains the shortest Al-N-iminyl bond among those with a four-coordinate aluminum center.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.200400159