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Triethylsilyl- and triphenylsilyl-chitins were synthesized from β-chitin in addition to trimethylsilyl-chitin, and the resulting three kinds of silylated chitins were evaluated in terms of solubility, stability, and reactivity as precursors for chemical modifications. Triethylsilylation was effected under appropriate conditions though less facilely than trimethylsilylation. Triphenylsilylation was...
In order to expand the scope of protection of the amino group of chitosan for synthesizing a key intermediate that would allow regioselective modification reactions, dichlorophthaloylation behavior was studied in detail. The reaction proceeded in a similar manner to phthaloylation, and chemoselectively protected N-dichlorophthaloyl-chitosan could be prepared either by partial hydrolysis of N,O-dichlorophthaloylated...
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