caa a22 4500 467949700 CHVBK 20180405193741.0 cr unu---uuuuu 170328e20050201xx s 000 0 eng 10.1007/s10570-004-5668-5 doi (NATIONALLICENCE)springer-10.1007/s10570-004-5668-5 (NATIONALLICENCE)springer-10.1023/B:CELL.0000049355.93592.44 Peracetylated cellulose: end group modification and structural analysis by means of 1H-NMR spectroscopy [Elektronische Daten] [Lars Einfeldt, Wolfgang Günther, Dieter Klemm, Brigitte Heublein] A homologous series of partially hydrolyzed celluloses (level-off-DP cellulose) with <italic>weight-average molecular weight</italic> (DPw) < 150 were peracetylated and characterized by 1H-NMR spectroscopy. The results demonstrate the utility of 1H-NMR spectroscopy to assign the chemical shifts of all end groups of the peracetylated cellulose. On the one hand, the chemical shifts of all methine and methylene protons of the non-reducing terminal end group (TEG) as well as the α- and β-anomer of the reducing end group (REG) could be determined by two-dimensional NMR techniques (COSY-DQF) and by selective excitation of isolated proton signals (1D-TOCSY) of these end groups. On the other hand, the spectral resolution was high enough to determine the number-average molecular weight (DPn) of peracetylated level-off-DP cellulose (LODP cellulose acetates) as shown in comparison with the data of gel permeation chromatography (GPC). This molecular weight determination of cellulose using end group analysis by means of 1H-NMR spectroscopy was demonstrated for the first time. Furthermore, a specific modification of hydroxyls in end groups could be exemplified in case of 1-OH-deacetylation of the REG of peracetylated LODP cellulose. Springer, 2005 Cellulose acetate nationallicence End group analysis nationallicence End group modification nationallicence Level-off degree of polymerization nationallicence NMR spectroscopy nationallicence Einfeldt Lars Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut Günther Wolfgang Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut Klemm Dieter Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut Heublein Brigitte Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 15-24 0969-0239 12:1<15 2005 12 10570 https://doi.org/10.1007/s10570-004-5668-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10570-004-5668-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Einfeldt Lars Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut NATIONALLICENCE 700 1- Günther Wolfgang Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut NATIONALLICENCE 700 1- Klemm Dieter Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut NATIONALLICENCE 700 1- Heublein Brigitte Institute of Organic and Macromolecular Chemistry, University of Jena, Lessingstr. 8, D-07743, Jena, Germany aut NATIONALLICENCE 773 0- Cellulose Kluwer Academic Publishers 12/1(2005-02-01), 15-24 0969-0239 12:1<15 2005 12 10570 NATIONALLICENCE 856 40 https://doi.org/10.1023/B:CELL.0000049355.93592.44 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer