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Synthesis and application of 3, 5-Di-tert-butylbenzyl chloroformate for the protection of amino functions and the improvement of solubility in polyurethane synthesis

✍ Scribed by Gunter Festel; Claus D. Eisenbach

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 213 KB
Volume: 341
Category: Article
ISSN: 1615-4150
DOI: 10.1002/(sici)1521-3897(199901)341:1<29::aid-prac29>3.0.co;2-e

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✦ Synopsis

The benzyloxycarbonyl (BOC) group was used for the protection of amino functions in the stepwise synthesis of molecularly uniform oligourethanes based on 1,5-naphthalene diamine (NDA) as well as polyurethane (PUR) elastomers with molecularly uniform NDA-based hard segments. Whereas the poor solubility of the BOC terminated key intermediates 5 in solvents suitable for condensation reactions of oligourethane building blocks in the planned synthesis route prevented the employing of this convenient protective group, the modified 3,5-di-tert-butyl substituted BOC

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