As opposed to the thoroughly studied carbon-bridged calixarenes,[1] heteroatom-bridged [1n] metacyclophanes and their derivatives have recently attracted much attention mainly because of novel structure-property relationships originating from the replacement of methylene bridges with heteroatom bridges.[2] On the other hand, only a few reports are known for [1n] paracyclophanes, probably as a result of the difficulty in synthesizing them ( ...
