B. Botta et al., Synthesis of C-alkylcalix[4]arenes, 6 - The interaction of resorcin[4]arenes with Fe-III in chloroform, EUR J ORG C, (5), 2000, pp. 841-847
Resorcinarene octamethyl ethers, bearing carboalkyloxy groups in the side c
hains, have been shown to interact with Fe-III in organic media. H-1-NMR st
udies, carried out using Ga-III instead of Fe-III, suggest that these syste
ms have two active sites of interaction, the first located at the aromatic
moiet and the other in the vicinity of the carbonyl groups. As a confirmati
on of this, resorcinarenes without carbonyl groups in the side chains have
been found to exhibit only one active site. Notably, in the latter case the
interaction results in configurational changes.