scholarly journals 13C NMR spectroscopy characterization of particle-size fractionated soil organic carbon in subalpine forest and grassland ecosystems

2017 ◽  
Vol 58 (1) ◽  
Author(s):  
Yo-Jin Shiau ◽  
Jenn-Shing Chen ◽  
Tay-Lung Chung ◽  
Guanglong Tian ◽  
Chih-Yu Chiu
2018 ◽  
Vol 628-629 ◽  
pp. 906-918 ◽  
Author(s):  
Jörg Prietzel ◽  
Svenja Müller ◽  
Ingrid Kögel-Knabner ◽  
Jürgen Thieme ◽  
Cherno Jaye ◽  
...  

2020 ◽  
Vol 54 (9-10) ◽  
pp. 835-844
Author(s):  
GABRIEL LARS ◽  
ANTJE TIED ◽  
THOMAS HEINZE

The present study describes the heterogeneous carboxymethylation of xylan,α-1,3-glucan, glucomannan, pullulan, curdlan, galactoglucomannan, and agarose with sodium monochloracetate (SMCA) using iso-propanol as slurry medium in the presence of caustic soda. Using heteropolysaccharides for the carboxymethylation, higher DS values are obtained compared to the DS of homopolysaccharides. The influence of the amount caustic soda in the reaction medium is studied. The characterization of the products obtained is performed by means of 13C-NMR spectroscopy. Carboxymethylation transforms the investigated polysaccharides into water-soluble products.


1994 ◽  
Vol 19 (1) ◽  
pp. 29-78 ◽  
Author(s):  
Irene Nehls ◽  
Wolfgang Wagenknecht ◽  
Burkart Philipp ◽  
Dorothea Stscherbina

2000 ◽  
Vol 31 (7-8) ◽  
pp. 655-668 ◽  
Author(s):  
Rita Kiem ◽  
Heike Knicker ◽  
Martin Körschens ◽  
Ingrid Kögel-Knabner

2018 ◽  
Vol 28 (2) ◽  
pp. 55
Author(s):  
Mohammedl Mujbe Hasson

A new N, N'-imidazolium salt 1-(2,6-diisopropylphenyl)-3- (4,6-dimorpholino -1,3,5-traizine-2-yl)-1H-imidazol-3-ium chloride) as a precursor of N - heterocyclic carbene ligand was prepared via the reaction of 1 - (2, 6 - diisopropyl phenyl - 1H - imidazole) with 1, 3, 5 - triazine derivative bearing morpholine substituent (2, 6 -dimorpholine - 6- chloro-1, 3, 5-triaziazine). Linear coordi-nated Ag (І) NHC complex was synthesised via deprotonation of the imidazolium salt and reac-tion with Ag2O in darkness at room temperature by in situ method. The complex was synthesised for using as transfer agent to prepare another transition metals complexes by transmetallation method in the future. The imidazolium salt and their silver complex have been characterized by 1 H and 13C NMR spectroscopy as well as mass spectrometry.


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