Re: ORGLIST:Vanillin changes colour

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From: Yuehui Zhou (yuehuizhou$##$hotmail.com)
Date: Sat Aug 03 2002 - 05:12:22 EDT

Joerg,

It's quite often that phenol compounds change the color to pink because of
the oxidation to quinones. I am not sure, but I don't think a catalyst is
necessary.

Y. Zhou

>From: Jörg Osthaus <joerg.osthaus$##$vr-web.de>
>To: <everybody$##$orglist.net>
>Subject: ORGLIST:Vanillin changes colour
>Date: Fri, 2 Aug 2002 17:33:21 +0200
>
>Hello,
>can anybody tell me the reason why pure vanillin changes colour to pink
>during storage? It is maybe possible that a reaction is catalysed by
>metal-ions or something else.
>Thank you for your help!
>
>Best regards,
>Jörg Osthaus
>
>
>--------------------------------------------------------------------------------
>
>Haarmann & Reimer GmbH
>FLA-RD-BDF - Technical Centre
>Mühlenfeldstr. 1
>Building D202
>37603 Holzminden
>Germany
>
>phone +49 55 31 90 22 60
>joerg.osthaus.jo$##$hr-gmbh.de

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