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We describe the first synthesis of hydroxy-functionalized polysaccharide esters via chemoselective olefin hydroboration–oxidation in the presence of ester groups. Cellulose esters with terminally olefinic side chains were first synthesized by esterification of commercially available cellulose esters (e.g., cellulose acetate) with undec-10-enoyl chloride or pent-4-enoyl chloride. Subsequent two-step,...