Figure 5
1H NMR spectra of the title compound in C6D6 at three different concentrations (bottom three spectra), and at an intermediate concentration with added ether (top two spectra). The CH2 group attached to Al has peaks A, B, C, and D, which are concentration dependent, and an expanded view from δ 1 to −1 ppm is shown in the lower part of the figure. The concentration of the small peak at 2.5 ppm (probably OH) is invariant in all samples and is undoubtedly due to hydrolysis caused by the release of a small amount of water during flame sealing of the NMR tubes. |