Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Simple modifications of the TiCl 4 -induced cyclocondensation of phenol derivatives raise the yields of pure calix [4]arenes, even in the presence of electron-withdrawing substituents. The first example of a calix [6]arene with alternate substituents is given.
![2,6-bis[(5-chloro-2-hydroxyphenyl)methyl]-4-nitrophenol结构式](https://image.chemsrc.com/caspic/454/71643-57-7.png)
![2,6-bis[(5-tert-butyl-2-hydroxyphenyl)methyl]-4-chlorophenol结构式](https://image.chemsrc.com/caspic/107/89553-17-3.png)