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Nucleus exchange

In the context of NMR, chemical exchange refers to any process in which a nucleus exchanges between two or more environments in which its NMR parameters (chemical shift, scalar or dipolar coupling, relaxation) differ. The effect of this exchange process on the appearance of the NMR spectrum depends on the rate of exchange relative to the mag-... [Pg.309]

Fig.6.6.1. Main polyhydric phenols generated from lignins in the nucleus exchange method... Fig.6.6.1. Main polyhydric phenols generated from lignins in the nucleus exchange method...
Table 6.6.1. Rate constants and activation energies for the demethylation of the methoxyl group in the nucleus exchange reaction. (Funaoka and Abe 1982e)... Table 6.6.1. Rate constants and activation energies for the demethylation of the methoxyl group in the nucleus exchange reaction. (Funaoka and Abe 1982e)...
Abe I, Funaoka M, Kodama M (1987) Phenolic nuclei of condensed tannins Approaches by the phenyl nucleus-exchange method Mokuzai Gakkaishi 33 582-588... [Pg.384]

Funaoka M, Abe I (1987a) Phenyl nucleus-exchange method for the degradation of lignin Wood Sci Technol 21 261-279... [Pg.385]

M Funaoka, I Abe, VL Chiang. Nucleus exchange reaction. In SY Lin, CW Dence, eds. Methods in Lignin Chemistry. Berlin Heidelberg Springer-Verlag, 1992, pp. 385-391. [Pg.43]

FD Chan, KL Nguyen, AFA Wallis. Estimation of the aromatic units in lignin by nucleus exchange A reassessment of the method. J Wood Chem Technol 15 473 91, 1995. [Pg.292]

See other pages where Nucleus exchange is mentioned: [Pg.2098]    [Pg.2103]    [Pg.141]    [Pg.473]    [Pg.319]    [Pg.369]    [Pg.370]    [Pg.371]    [Pg.373]    [Pg.374]    [Pg.375]    [Pg.377]    [Pg.379]    [Pg.381]    [Pg.383]    [Pg.385]    [Pg.386]    [Pg.200]    [Pg.202]    [Pg.208]    [Pg.473]    [Pg.498]    [Pg.499]    [Pg.500]    [Pg.501]    [Pg.502]    [Pg.503]    [Pg.504]    [Pg.505]    [Pg.506]    [Pg.191]    [Pg.16]    [Pg.270]   
See also in sourсe #XX -- [ Pg.319 , Pg.369 , Pg.370 , Pg.371 , Pg.372 , Pg.373 , Pg.374 , Pg.375 , Pg.376 , Pg.377 , Pg.378 , Pg.379 , Pg.380 , Pg.381 , Pg.382 , Pg.383 , Pg.384 , Pg.385 ]

See also in sourсe #XX -- [ Pg.319 , Pg.369 , Pg.370 , Pg.371 , Pg.372 , Pg.373 , Pg.374 , Pg.375 , Pg.376 , Pg.377 , Pg.378 , Pg.379 , Pg.380 , Pg.381 , Pg.382 , Pg.383 , Pg.384 , Pg.385 ]



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Nucleus Exchange Reaction

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