Synthesis and Characterization of Organoaluminum Compounds Containing the Trimethylsilylmethyl Substituent Al(CH2SiMe3)2Br, Al(CH2SiMe3)2H and (Me3SiCH2)2AlPPh2 and a Reinvestigation of the Chemistry of Me2AlPPh2 and Et2AlPPh2.
STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
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The new amphoteric ligand, Me3SiCH22AlPPh2, has been prepared from the reactions of either AlCH2SiMe33 or AlCH2SiMe32H with PPh2H or AlCH2SiMe32Br with KPPh2 and fully characterized by analysis, cryoscopic molecular weight measurements, IR and 1H NMR data. This aluminum-phosphide is unique as it exists as a monomer-dimer equilibrium mixture in benzene solution. The syntheses and characterization of the new compounds AlCH2SiMe32H and AlCH2SiMe32Br are also described. Since the chemistry of aluminum-phosphides as amphoteric ligands is of interest, the behavior of Me3SiCH22AlPPH2, Me2AlPPH22 and Et2AlPPH22 toward common solvents, Et2O, THF and CH3CN, was investigated. The aluminum phosphides readily cleave THF and reduce the triple bond of CH3CN at room temperature. However, neither THF nor Et2O form isolable adducts with aluminum phosphides. The unusual melting point behavior of aluminum phosphides is also discussed. Author
- Organic Chemistry