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Chapter 7 181<br />

D4<br />

This sample was prepared as D3 using 160mg ip (2 molar equivalent to that of H3BTC)<br />

instead. The resulting powder products were collected by centrifugation. Afterwards, they<br />

were washed by EtOH (30 ml x 3) and acetone (30 ml x 3) subsequently. Finally, the<br />

solvent was removed and the powder was dried under ambient atmosphere at room<br />

temperature. The activation of the solids was performed by heating at 120 °C for 24 h<br />

under dynamic vacuum (ca. 10 -3 mbar).<br />

Figure 7.18. 1 H-NMR spectra of the acid-digest D4 sample (solvent: DMSO-d 6 , DCl).

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