43074-36-8Relevant academic research and scientific papers
A [2+2+2]-Cyclotrimerization Approach to Selectively Substituted Fluorenes and Fluorenols, and Their Conversion to 9,9′-Spirobifluorenes
Kaiser, Reinhard P.,Hessler, Filip,Mosinger, Ji?í,Císa?ová, Ivana,Kotora, Martin
, p. 13577 - 13582 (2015)
Synthesis of selectively substituted fluorenes and fluorenols was achieved by using catalytic [2+2+2]cyclotrimerization. Various starting diynes were reacted with different alkynes in the presence of a catalytic amount of Wilkinson's catalyst (RhCl(PPh3)3) providing the compounds possessing the fluorene scaffold in good isolated yields. A set of four regioselectively substituted fluorenols was converted to the corresponding 9,9′-spirobifluorenes and their spectral characteristics were measured. A select group! Selectively substituted fluorenes and fluorenols were synthesized by RhCl(PPh3)3 catalyzed [2+2+2]-cyclotrimerization of the diynes with alkynes. Fluorenols were subsequently transformed into a set of four regioselectively substituted 9,9′-spirobifluorenes.
