Introduction Parts I and II of this series of papers reported on the reaction of 1,3,2-dioxaphospholanyl chloride (I) with monosaccharides, polysaccharides, lignin-carbohydrate complexes, and a wide variety of model compounds for lignin (Archipov et al. 1991, Parts I and II). In this reaction (Scheme 1), the labile protons in lignins were easily derivatized with trivalent phosphorus nuclei, which can then be subject to 31P NMR analysis. 31P, with its non-zero spin (I = 1/2), is the only naturally occurring isotope of phosphorus. Therefore, it is an ideal nucleus for determining the chemical structure of phosphorus-containing compounds by means of nuclear magnetic resonance spectroscopy (31P NMR). When this novel technique was applied to soluble lignins, it proved a powerful means of probing their structures. ROH + C I - P Pyridine/CDCI R-O-P +HCI (D Where R = Residues of phenols, alcohols, aldehydes, sugars, « carboxylic acids Scheme 1. The derivatization reaction used throughout this work: the reaction of 1,3,2-dioxaphospholanyl chloride (I) with labile protons. Holzforschung /Vol. 47 / 1993 / No. 1 © Copyright 1993 by Walter de Gruyter · Berlin - New York The principle underlying the method is as follows: In the presence of a magnetic field
Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood – de Gruyter
Published: Jan 1, 1993
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