Regioselective distal-Dibromination of Calixresorcinarene
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The partial bromination of calixresorcinarene with a limited amount of <I>N</I>-bromosuccinimide was examined. The ratio of the two dibromo derivatives, <I>distal</I>- and <I>proximal</I>-isomers, was 10:1, which is much different from the statistical value of 1:2. The simple procedure for the preparation of the <I>distal</I>-dibromo derivative is described.
- Chemistry Letters
Chemistry Letters 1997(2), 185-186, 1997-02
The Chemical Society of Japan