endo-, exo-Cavity hydride isomerism for an aluminium complex of dimetallated 1,3-dimethyl ether p-tert-butylcalix[4]arene
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Chemical Communications
- No. 17,p. 2035-2036
- https://doi.org/10.1039/cc9960002035
Abstract
Reaction 1,3-dimethyl ether p-tert-butylacalix[4]arene 1 with H3AlNMe3 in toluene gives an isomeric mixture of monomeric five-corrdinate metallocalixarene species derived from dimetallation with the metal centres attached to four oxygens and a hydride either exo(2a) or endo(2b) to the calixarene cavity; 2a is converted to thermodynamically favoured 2b in the presence of H3AlNMe3, with the chloro-analogue of 2a, 3 (formed exclusively from the reaction of 1 and AlCl3) preferentially affording 2b when treated with NaH.Keywords
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