ORGLIST: mechanism_of_reaction?

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From: Jim Sims (jsims$##$ucrac1.ucr.edu)
Date: Thu Apr 26 2001 - 12:46:18 EDT


I seem to remember that the basis of these colors is carbonium ions formed
from reaction of alcohols or double bonds with the strong acid. I have
never pursued the question. However, I remember seeing a study on the
Lieberman- Burchardt reaction along theses lines. JIM






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>Date: Thu, 26 Apr 2001 10:34:55 +0200
>From: Jacek Achremowicz <mfachrem$##$cyf-kr.edu.pl>
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>Subject: ORGLIST: mechanism_of_reaction?
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> Dear Members of Orglist,
>
>I am looking for any information about mechanism of reaction of triterpene
>or steroid type compounds with conc. sulfuric acid or SbCl3.
>
>The structures with the reagents give unstable colour compounds yellow,
>red or brown depending on the structure of the compound (in CHCl3 solution
>or in TLC).
>
>I have been working with the triterpene like compounds for 2 years but I
>have not found the information yet, so if anybody would help me I would be
>very grateful.
>
>
>
>Jacek Achremowicz
> ;
>Dept. of Pharmacognosy
> ;
>Coll. Med. of Jagiellonian University
> ;
>Cracow,
> ;
>POLAND
> ;
>mfachrem$##$cyf-kr.edu.pl
>
>
>

Professor Jim Sims
Department of Plant Pathology
University of California, Riverside
Riverside, CA 92521
Voice: 909 787 4127
FAX 909 787 4294


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