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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ball, Graham E. Cole, Marcus L. Mckay, Alasdair I. |
| Description | Author Affiliation: Ball GE ( School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia.) |
| Abstract | The reactions of the N-heterocyclic carbene 1,3-dimesitylimidazol-2-ylidene (IMes) with Ga[GaCl $_{4}]$ , “ GaI ”, InCl $_{2}$ and GaBr $_{3}$ have been examined. All reactions using a low valent gallium or indium starting material led to species of the form [{MX $_{2}(IMes)\}$ $_{2}]$ , where M = Ga, X = Cl (1), I (2); M = In, X = Cl (3), with disproportionation and loss of gallium metal in the case of 2. Reaction of IMes with gallium tribromide yields the air and moisture stable complex $[GaBr_{3}(IMes)]$ (4), which has been used as a precursor to the mixed bromohydrides $[GaBrH_{2}(IMes)]$ (5) and $[GaBr_{2}H(IMes)]$ (6) by (i) ligand redistribution with $[GaH_{3}(IMes)],$ (ii) hydride – bromide exchange with triethylsilane , and (iii) alkylation with $^{n}butyllithium$ followed by β-hydride elimination (6 only). Attempts to prepare 1, or monovalent analogues such as [ {GaCl(IMes)} $_{n}$ ], by thermally induced reductive elimination of dihydrogen from the chlorohydride congeners of 5 and 6 resulted in isolation of the known compounds [IMesCl][Cl] ( IMesCl = 1,3-dimesityl-2-chloroimidazolium ), and/or 1,3-dimesityl-2-dihydroimidazole , and gallium metal. Preliminary photochemical NMR spectroscopy and catalytic studies of 5 and 6 aimed at reductive dehydrogenation under milder conditions are reported. Compounds 1 and 4 have been characterised by single crystal X-ray structure determination . |
| ISSN | 14779226 |
| Issue Number | 3 |
| Journal | Dalton Trans. |
| Volume Number | 41 |
| e-ISSN | 13645447 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2012-01-21 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Inorganic Chemistry |
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