title: Synthesis and structure of built-up organic macromolecules containing helicene.
abstract: Built-up macromolecules are acyclic molecules with molecular weights of several thousand daltons, which are synthesized by connecting small molecular units using stepwise methods. The chemical study of built-up macromolecules reveals some noteworthy properties that are different from those of conventional biological and synthetic macromolecules. A characteristic feature of built-up organic macromolecules is that their structures and properties are discontinuous at a certain molecular weight. For such macromolecules, variation in the small molecular units and the formation of cyclic structures substantially affect the structure and properties. The built-up organic macromolecules obtained by connecting helicenes with amide, acetylene, and amine groups are discussed in this paper. Some chiral built-up macromolecules are linked by covalent bonds, and the effects of linking on the structure are compared.
authors.affiliation: Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Amemiya
authors.forename: Masahiko
authors.initials: M
authors.lastname: Yamaguchi
mesh_terms: D000480:Alkynes / Q000737:chemistry; D000577:Amides / Q000737:chemistry; D000588:Amines / Q000737:chemistry; D002942:Circular Dichroism; D003500:Cyclization; D046911:Macromolecular Substances / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D011083:Polycyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D000480:Alkynes; D000577:Amides; D000588:Amines; D046911:Macromolecular Substances; D011083:Polycyclic Compounds; C031660:helicenes