Phenolic aldehydes are derivatives of phenol.Friedrich Brühne and Elaine Wright "Benzaldehyde" in Ullmann's Encyclopedia of Industrial Chemistry, 2002, Wiley-VCH, Weinheim. Phenolic aldehydes can be found in wines and cognacs.Determination of Phenolic Aldehydes in Cognacs and Wines by Capillary Electrophoresis: New Cognac Quality Markers. A. G. Panosyan, G. Mamikonyan, M. Torosyan, A. Abramyan, A. Oganesyan, E. S. Gabrielyan, A. Grigoryants, S. Mkhitaryan and B. V. Lapin, Journal of Analytical Chemistry, Volume 57, Number 4, 356-361, 2002,
Examples : Hydroxybenzaldehydes Dihydroxybenzaldehydes Vanillin and isovanillin 2,3,4-trihydroxybenzaldehyde can be isolated from Antigonon leptopus.Health-Beneficial Phenolic Aldehyde in Antigonon leptopus Tea. Vanisree Mulabagal, Ruby L. Alexander-Lindo, David L. DeWitt and Muraleedharan G. Nair, eCAM, 2009
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