para-Bridged symmetrical pillar[5]arenes: their Lewis acid catalyzed synthesis and host-guest property.
Condensation of 1,4-dimethoxybenzene (DMB) with paraformaldehyde in the presence of BF3.O(C2H5)2 gave novel para-bridged pentacyclic pillar DMB (DMpillar[5]arene). Moreover, para-bridged pentacyclic hydroquinone (pillar[5]arene) was prepared. Pillar[5]arene formed 1:1 host-guest complexes with dialkyl viologen and alkyl pyridinium derivatives. However, pillar[5]arene did not form complexes with the diadamantyl viologen derivative since a bulky adamantyl group was unable to thread the cavity of pillar[5]arene.
Ogoshi
Tomoki
T
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. ogoshi@t.kanazawa-u.ac.jp
Kanai
Suguru
S
Fujinami
Shuhei
S
Yamagishi
Tada-aki
TA
Nakamoto
Yoshiaki
Y