Publication at Faculty of Science |
2009
Abstract
Thiacalix[4]arene immobilized in the cone conformation undergoes a direct formylation reaction giving unusual products in high yields. The Duff reaction (urotropine/TFA) leads to unprecedented intra-molecularly bridged compounds possessing two formyl groups on the opposite para- or para-/meta- positions.
The comparison with the corresponding classical calix[4]arene analogues indicates an amazingly different reactivity of the thiacalix[4]arene system.