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Chapter 7 183<br />

D6<br />

This sample was obtained as D5 using 80 mg ip instead. [140] The resulting blue powder<br />

products were collected by centrifugation. Afterwards, they were washed by DMF(30 ml<br />

x 3), EtOH (30 ml x 3) and acetone (30 ml x 3) subsequently. The final powder was<br />

collected and dried under ambient atmosphere at room temperature. The activation of the<br />

solids was performed by heating at 140 °C for 24 h under dynamic vacuum (ca. 10 -3 mbar).<br />

Figure 7.20. 1 H-NMR spectra of the acid-digest D6 sample (solvent: DMSO-d 6 , DCl).

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