The incorporation of benzene rings into these compounds led to the development of calixarenes. The first one was discovered in 1967 by Charles Pederson and contained six oxygen atoms. The interior of these 1  molecules is water-like, while the exterior is hydrocarbon-like, and they can participate in "host-guest" chemistry, usually with cations. They are often used to dissolve inorganic salts such as potassium permanganate into organic solutions 
The incorporation of benzene rings into these compounds led to the development of calixarenes. The first one was discovered in 1967 by Charles Pederson and contained six oxygen atoms. The interior of these 1  molecules is water-like, while the exterior is hydrocarbon-like, and they can participate in "host-guest" chemistry, usually with cations. They are often used to dissolve inorganic salts such as potassium permanganate into organic solutions and they also possess the ability to extract metallic salts from solutions. FTP, name these molecules where each oxygen atom is bound between two carbon atoms, arranged in a ring, and fit for a king to wear.
The incorporation of benzene rings into these compounds led to the development of calixarenes.
Crown Ethers (prompt on ”ether”)