Activated Phenacenes from Phenylenes by Nickel-Catalyzed Alkyne Cycloadditions
作者:Zhenhua Gu、Gregory B. Boursalian、Vincent Gandon、Robin Padilla、Hao Shen、Tatiana V. Timofeeva、Paul Tongwa、K. Peter C. Vollhardt、Andrey A. Yakovenko
DOI:10.1002/anie.201103428
日期:2011.9.26
Going zigzag, helical, or in‐between: Angular phenylenes show a propensity for adding alkynesfrom the bay region in processes catalyzed by [Ni(cod)(PMe3)2] (see scheme). These transformations generate novel strain‐ and electronically activatedphenacenes. Mechanistic studies in conjunction with DFT calculations (R=Ph) provide a plausible mechanistic picture.
The total synthesis of angular [4]- and [5]phenylene
作者:Rachel H. Schmidt-Radde、K. Peter C. Vollhardt
DOI:10.1021/ja00050a091
日期:1992.11
Cobalt-Mediated Synthesis of Angular [4]Phenylene: Structural Characterization of a Metallacyclopentadiene(Alkyne) Intermediate and Its Thermal and Photochemical Conversion
作者:Peter I. Dosa、Glenn D. Whitener、K. Peter C. Vollhardt、Andrew D. Bond、Simon J. Teat
DOI:10.1021/ol025956o
日期:2002.6.1
metallacyclopentadiene(alkyne) complex has been obtained. This type of metallacycle is believed to be the key intermediate in the cobalt-mediated [2 + 2 + 2]cycloaddition of alkynes. Thermal treatment leads to the generation of angular [4]phenylene, the X-ray structural details of which are described. Under photochemical conditions, the cobaltacycle isomerizes to a highly strained (cyclobutadieno)dibenzocyclooctatrienyne