title: 2,8- and 2,9-Diboryltetracenes as useful building blocks for extended pi-conjugated tetracenes.
abstract: Ir-catalyzed direct diborylation of tetracene gave a 1:1 mixture of 2,8- and 2,9-bis[(pinacolato)boryl]tetracenes, which were separated by recrystallization. These diboryltetracenes are useful building blocks for the regiospecific synthesis of extended pi-conjugated tetracenes directed to semiconductors for organic field-effect transistors (OFETs). Syntheses of thiophene-tetracene-thiophene, thiophene-tetracene-bithiophene-tetracene-thiophene, and thiophene-tetracene-anthracene-tetracene-thiophene pi-systems have been achieved on the basis of the 2,8- and 2,9-diboryltetracenes.
authors.affiliation: Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
authors.forename: Takakazu
authors.initials: T
authors.lastname: Kimoto
authors.forename: Kenro
authors.initials: K
authors.lastname: Tanaka
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Sakai
authors.forename: Akira
authors.initials: A
authors.lastname: Ohno
authors.forename: Kenji
authors.initials: K
authors.lastname: Yoza
authors.forename: Kenji
authors.initials: K
authors.lastname: Kobayashi