Pillararene
Encyclopedia
Pillararenes are macrocycles composed of hydroquinone
Hydroquinone
Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, having the chemical formula C6H42. Its chemical structure, shown in the table at right, has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid...

 units (5 or 6) linked in the para position. They are structurally similar to the cucurbituril
Cucurbituril
Cucurbiturils are methylene-linked macrocyclic molecules made of glycoluril [=C4H2N4O2=] monomers. The oxygen atoms are located along the edges of the band and are tilted inwards, forming a partly enclosed cavity...

s and calixarenes that play an important part in host-guest chemistry
Host-guest chemistry
In supramolecular chemistry, host-guest chemistry describes complexes that are composed of two or more molecules or ions that are held together in unique structural relationships by forces other than those of full covalent bonds. Host-guest chemistry encompasses the idea of molecular recognition...

. Pillar[5arene], the first pillarene, was synthesized by Tomoki Ogoshi at Kanazawa University
Kanazawa University
is a national university of Japan located in the city of Kanazawa, the capital of Ishikawa Prefecture.Kanazawa University is divided into two main campuses: Kakuma and Takaramachi. Student enrollment is about 11,000 including 350 international students....

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