Improved synthetic methods are described for the synthesis of concave receptor molecules. These receptors consist of a diphenylglycoluril unit, flanked by two aromatic moieties. The most versatile synthetic method consists of Lewis‐acid‐catalyzed reaction of a tetrakis(chloromethyl) derivative of diphenylglycoluril with the appropriate benzene or naphthalene derivative.
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Sijbesma et al. (1993) studied this question.
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