The Attempted Syntheses of Low Oxidation State, Organometallic Derivatives of Aluminum, Gallium and Indium, a New Synthesis of Al(CH2SiMe3)3.
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
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The synthesis of KAlCH2SiMe32 by a reductive elimination reaction between AlCH2SiMe33 and KH has been attempted but a pure product could not be isolated. The reactants combine at 70 C to form KAlCH2SiMe33H, a white pyrophoric solid, which has been fully characterized. A molecular weight study indicates the presence of a mixture of monomeric and dimeric species in benzene solution. The pyrolysis of KAlCH2SiMe33H at 205 C produces SiCH34 but also CH4. The formation of SiCH34 suggests that KAlCH2SiMe32 might have been formed but the presence of CH4 indicates that a decomposition reaction occurs either prior to or after the formation of KAlCH2SiMe32. The reactions of mixtures of KH-AlCH33, KH-GaCH33, NaH-GaCH33, KH-InCH33 and NaH-InCH33 have also been investigated in order to determine the role of the organic substituent in the attempted reductive elimination reactions. In all cases the formation of CH4 during pyrolysis of KAlCH3H, KGaCH33H and the other reaction mixtures is consistent with the occurrence of reduction but no pure compounds could be isolated. A new synthetic route to AlCH2SiMe33 from AlBr3 and LiCH2SiMe3 in refluxing hexane is also described. Author
- Organic Chemistry