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RESEARCH PRODUCT

Double- and Multi-Calixarentes

subject

description

Calixarenes are easily (and often selectively) functionalized and therefore they can be combined in various ways to larger molecules containing more than one calixarene substructure. In the following chapter we will try to give an overview on such multicalixarenes held together by "conventional" covalent links. Self-assembled structures are treated separately in Chapter 8. The earliest examples for double calixarenes of importance are the carcerands and hemicarcerands of D. Cram in which two resorcarene derived cavitands are combined. Due to their unique properties to include (more or less permanently) smaller molecules, they are treated separately in Chapter 10. Further combinations of cavitands and calixarenes are described in Chapter 9. The following survey is ordered mainly under structural aspects, which is not possible without some arbitrary classifications. Some frequently used building blocks for the construction of multicalixarenes are shown in Figure 1. Their synthesis is described in Chapter 2.