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Original version
Hagemann, H.; Imkampe, K.: Über die Reaktion von Vanillin mit phenolischen Verbindungen. In: Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 27 (1972), Nr. 6, S. 705-707. DOI: https://doi.org/10.1515/znb-1972-0623
Electron densities at the nucleus of several simple phenols and plant phenols such as catechin and quercetin are calculated by the HMO-method. We found a correlation between the maximum of the electron density at the nucleus and the extinction value of the reaction product with vanillin. With the exception of quercetin an explanation is given by the HMO-calculation. Investigations into the structure of the reaction products have been carried out.