Dimercuration of Calix[4]arenes: Novel Substitution
Pattern in Calixarene Chemistry
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Abstract
A mercuration
reaction of tetrapropoxycalix[4]arene immobilized in the <i>cone</i> conformation gave a mixture of two dimercurated products (<i>meta</i>,<i>meta</i> and <i>meta</i>,<i>para</i>) in approximately a 1:1 ratio. Both regioisomers represent
inherently chiral compounds, which makes them very attractive for
design of novel receptors. As demonstrated by Pd-catalyzed arylation,
the different reactivity of HgCl functions in the <i>meta</i>,<i>para</i>-disubstituted isomer opens the door for regioselective
introductions of two different functional groups to achieve a substitution
pattern so far unknown in calixarene chemistry