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- W2086097528 abstract "The synthesis of monomethoxytriphenylmethyl (MMtrityl) starch and the subsequent carboxymethylation of the 6-O-functionalized products were investigated. The trityIation both in N,N-dimethylacetamide (DMA)/LiCl and in dimethyl sulfoxide (DMSO) occurred homogeneously. The highest degree of substitution of trityl groups (DSTrityI) obtained after a single conversion step was 0.77 in both solvents. A complete functionalization of primary OH-groups was achieved only with unsubstituted triphenylmethyl chloride in these reaction media. In case of monomethoxytriphenylmethyl chloride (MMTMC) as reagent an additional conversion step is necessary to synthesize products with a DSTrityI = 1. The structure of the products was analyzed by FTIR- and 13C-NMR spectroscopy. Subsequent carboxymethylation of the MMtrityl starch samples leads to products with a preferred functionalization of the unprotected secondary OH-groups. After removal of the trityl moieties, the DSCM and the distribution of carboxymethyl groups within the anhydroglucose unit was investigated by means of HPLC and 1H-NMR spectroscopy. The carboxymethylation was more effective at O-2 than at O-3. In case of ether products with DSTrityl < 1 a partial substitution of the primary OH group took place as well." @default.
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- W2086097528 date "2001-06-01" @default.
- W2086097528 modified "2023-10-17" @default.
- W2086097528 title "Starch Derivatives of High Degree of Functionalization. 4. Homogeneous Tritylation of Starch and Subsequent Carboxymethylation" @default.
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- W2086097528 doi "https://doi.org/10.1002/1521-379x(200106)53:6<261::aid-star261>3.0.co;2-z" @default.
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