Resorcarene-based carcerands

Since the preparation of 6.97, an enormous range of carcerand and hemicarcerand species have been prepared based upon both [n]resorcarenes and calix[n]arenes (n = 4,5), all of which exhibit interesting binding behaviour and intra-cavity reactivity, as we will see in the next sections. 

Explain why careerism is not observed for small carcerands based purely on [4] resorcarenes, such as 6.98. 

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