Selective functionalization of calix[4]arenes via tricarbonylchromium complexes
- 1 February 1993
- journal article
- research article
- Published by Taylor & Francis in Supramolecular Chemistry
- Vol. 1 (2), 103-106
- https://doi.org/10.1080/10610279308040654
Abstract
Tricarbonylchromium complexes of 25,26,27,28-tetrapropoxycalix[4]arene conformers (14Pr) were synthesized. Since the benzene ring is activated through complexation with Cr(CO)3, the functional groups (e.g. [sbnd]D, [sbnd]CH3, and [sbnd]CHO) could be selectively introduced into the Cr(CO)3-complexed benzene ring. The substitution reaction occurred mainly at the p-position. The para selectivity was attributed to the steric crowding being relatively lower than that around the meta and benzyl position. This view was supported by the X-ray crystallographic study of 1,3-alternate-14Pr·(CO)3. This is a novel and general methodology for selective introduction of functional groups into calix[n]arenes.Keywords
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