Article 13C NMR Spectroscopic Studies of Phenylcoumaran and 1,2-Diarylpropane Type Lignin Model Compounds. Part 2. Substituent Effects on 13C Chemical Shifts of Aromatic Carbons was published on January 1, 1992 in the journal Holzforschung (volume 46, issue 1).
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Miyakoshi et al. (1992) studied this question.
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