Abstract: To reduce cost for the method for separating semiconducting carbon nanotube from a mixture of metallic and semiconducting carbon nanotubes. The separation method includes preparing a dispersion by mixing a first substance, a second substance, SDS, SC, and a mixture of metallic and semiconducting carbon nanotubes with a solvent, wherein the dispersion into two layers, which are a first layer mainly containing the first substance and a second layer mainly containing the second substance, whereby the semiconducting carbon nanotube is transferred into the first layer, and the metallic carbon nanotube is transferred into the second layer, wherein the first substance is an ?-glucan which is composed of glucose linked via ?-glucosidic linkage and which has a weight average molecular weight Mw of 4,000 to 7,000 and has a ratio in amount of ?-1, 6 linked glucose residues to the entire glucose residues of 40 to 70%.

Abstract: This invention selectively synthesizes a cycloparaphenylene compound having 10, 11, or 13 benzene rings. The invention also synthesizes a cycloparaphenylene compound in which a functional group is introduced into a desired portion. By reacting specific raw materials using a specific reaction, a cyclic compound having 10, 11, or 13 bivalent aromatic hydrocarbon groups, bivalent heterocyclic groups, or derivative groups thereof can be selectively obtained as a pure substance.

Abstract: This invention provides: a compound for accurately forming a carbon nanoring that contains a specific number of organic rings and has a definite diameter; a method for producing the compound; a method for efficiently producing a carbon nanoring; and a cycloparaphenylene obtained by the production method. The carbon nanoring of the present invention is a compound obtained by bonding a specific number of organic ring groups. The method for producing a carbon nanoring of the present invention comprises a modification step wherein a halogen atom in a U-shaped compound is modified into a boron compound, and a coupling step wherein the U-shaped compound is subjected to a coupling reaction. The U-shaped compound is a novel compound that has cyclohexane rings, benzene rings, and specific organic ring groups.

Abstract: This invention selectively synthesizes a cycloparaphenylene compound having 10, 11, or 13 benzene rings. The invention also synthesizes a cycloparaphenylene compound in which a functional group is introduced into a desired portion. By reacting specific raw materials using a specific reaction, a cyclic compound having 10, 11, or 13 bivalent aromatic hydrocarbon groups, bivalent heterocyclic groups, or derivative groups thereof can be selectively obtained as a pure substance.

Abstract: The present invention produces Cyclic Compound (1) in which organic ring groups including cyclohexane rings and benzene rings are continuously bonded, using a compound having at least one cyclohexane ring and benzene rings with halogen atoms at the two terminuses, in the presence of a nickel compound (bis(1,5-cyclooctadiene)nickel, etc.). Thereafter, by converting the cyclohexane rings in Cyclic Compound (1) into benzene rings, a desired carbon nanoring can be obtained. Thereby, the present invention efficiently produces a carbon nanoring made of a compound having a cyclic structure in which a desired number of organic ring groups are continuously bonded, with a short production process.

Abstract: This invention provides: a compound for accurately forming a carbon nanoring that contains a specific number of organic rings and has a definite diameter; a method for producing the compound; a method for efficiently producing a carbon nanoring; and a cycloparaphenylene obtained by the production method. The carbon nanoring of the present invention is a compound obtained by bonding a specific number of organic ring groups. The method for producing a carbon nanoring of the present invention comprises a modification step wherein a halogen atom in a U-shaped compound is modified into a boron compound, and a coupling step wherein the U-shaped compound is subjected to a coupling reaction. The U-shaped compound is a novel compound that has cyclohexane rings, benzene rings, and specific organic ring groups.