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 in | European journal of inorganic chemistry no. 20; pp. 4046 - 4051 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Wiley
18.10.2004
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Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1434-1948 1099-0682 |
DOI: | 10.1002/ejic.200400159 |