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The Development of Novel Antibiotics Using ... - Jacobs University

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Product ions appeared as [M+H] +<br />

Intens.<br />

771.4401<br />

1500<br />

1000<br />

751.5170<br />

867.5432<br />

500<br />

0<br />

760 780 800 820 840 860 880 900 m/z<br />

Figure 16. ESI-TOF mass spectrum showing higher oligomers formed in the [3+3]-cyclocondensation<br />

reaction <strong>of</strong> (1R,2R)-1,2-diaminocyclohexane 1 and terephthaldehyde 2, mass<br />

spectrum recorded after 10 minutes from the start <strong>of</strong> the reaction from DCM and MeOH.<br />

Intens.<br />

751.5170<br />

8000<br />

6000<br />

4000<br />

2000 722.5088 761.4189<br />

867.5432<br />

800.6024<br />

0<br />

700 725 750 775 800 825 850 875 900 m/z<br />

Figure 17. ESI-TOF mass spectrum showing higher oligomers formed in the [3+3]-cyclocondensation<br />

reaction <strong>of</strong> (1R,2R)-1,2-diaminocyclohexane 1 and isophthaldehyde 3, mass<br />

spectrum recorded after 10 minutes from the start <strong>of</strong> the reaction from DCM and MeOH.<br />

9 | S

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