HMF glasses

DIPEA (8 8 12 mmol each) as the coupling reagents. Completion of each coupling reaction was monitored by the ninhydrin test. Finally, the fully protected peptide-HMFS-resin was collected by filtration on a glass filter, washed well with MeOH and dried wt of the resin 5.97 g. 

In another vein, the polytransesterification of monomer 14, readily obtained from HMF, yielded the interesting material 15 because of the photosensitivity of the -2,5-Fu—CO—CH=CH— moiety (see Section 6.7.2) which reacted by coupling with another such moiety (statistically belonging to another polyester chain), thus ultimately providing a rigid crosslinked product. Copolymers based on 14 and aliphatic hydroxyesters were also prepared and the ensuing crosslinked materials displayed glass transition temperatures well below room temperature and were therefore elastomers [40]. 

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