Proximal 1,2-bis-demethylation of tetramethoxy-p-t-butylcalix[4]arene 1 has been achieved for the first time by Ti(IV)-assisted reaction, which allows the synthesis of a new type of calixarene-based bis-crown ether.
A. Arduini, A. Casnati, L. Dodi, A. Pochini and R. Ungaro, J. Chem. Soc., Chem. Commun., 1990, 1597 DOI: 10.1039/C39900001597
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