From: Roux, Stephane (RouxS$##$corning.com)
Date: Wed Jun 21 2000 - 02:42:02 EDT
Hi
I had the same problem a few years ago,
you should insure that your CH2Cl2 is as dry as possible
and more important, does not contain any acidic traces
due to decomposition of itself.
In fact the proble arise when you evaporate the solvent : the few acidic traces
are concentrated and so.....
Hope this help
SR
****************************************
Dr Stephane Roux
> ----------
> De : Kamil Wojciechowski[SMTP:kamilwoj$##$chemix.ch.pw.edu.pl]
> Date : mardi 20 juin 2000 11:46
> A : Multiple recipients of list orglist
> Objet : ORGLIST: Schiff bases
>
> Hello, I have some problems with salophenes (Schiff bases). The problem
> is as follows: the synthesis of salophene from salicylaldehyde and
> o-phenylenediamine is performed in MeOH/CH2Cl2. But once synthesised,
> when dissolved in CH2Cl2 seems to be not stable. UV/VIS spectra confirm
> that in CH2Cl2 solution the peaks from salicyaldehyde appears. That may
> indicate decomposition of salophene. But is it possible that so
> "neutral" solvent as dichloromethane is able to destroy the imine
> bonds ?
> Thank you in advance
> --
> Kamil Wojciechowski, Ph.D. student
> Department of Analytical Chemistry,
> Warsaw University of Technology,
> Noakowskiego 3, 00-664 Warsaw, Poland.
> Tel.: 0-22-660-56-31
> e-mail: kamilwoj$##$ch.pw.edu.pl
> kamilwoj$##$chemix.ch.pw.edu.pl
> http://www.ch.pw.edu.pl/~kamilwoj/index.html
>
>
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