Polymer-Supported-Cobalt-Catalyzed Regioselective Cyclotrimerization of Aryl Alkynes
Abhijit Sen, Takuma Sato, Aya Ohno, Heeyoel Baek, Atsuya Muranaka, Yoichi M. A. Yamada
Abstract
, the regioselective formation of 1,3,5-triarylbenzene was realized without 1,2,4-triarylbenzene formation. Further, a multigram-scale (11 g) reaction proceeded efficiently. In addition, the polymer-supported catalyst was successfully recovered and used three times. X-ray photoelectron spectroscopy analysis of the recovered catalyst suggested that cobalt was in the +2 oxidation state. The 1,3,5-triarylbenzene derivatives were applied to the synthesis of a molecular beam electron resist and a polycyclic aromatic hydrocarbon.
Topics & Concepts
CatalysisCobaltRegioselectivityArylChemistryX-ray photoelectron spectroscopyPolymerSelectivityPolymer chemistryOxidation stateOrganic chemistryAlkylChemical engineeringEngineeringCatalytic Alkyne ReactionsCatalytic C–H Functionalization MethodsCyclopropane Reaction Mechanisms