English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Various fluorosubstituted benzoylchlorides 1a-c are transformed into the corresponding acylpyridinium triflates 2a-c by one equivalent of the reagent pair 4-dimethyl-aminopyridine/ trimethylsilyltriflate (DMAP/TMSOTf). Due to the combined electrostatic and mesomeric effect of the acylpyridinium function, fluorine substituents in o- and p-positions can be subsequently substituted with a pyridinio group by additional equivalents of DMAP/ TMSOTf via an S N Ar mechanism. Whereas the p-substitution product can be isolated as the highly electrophilic dication salt 3b, the corresponding mono- and bis-orthosubstituted polycation salts 3a and 3c are transformed under the reaction conditions to the 7-azoniafluorenone derivatives 4a,c by a novel cyclo-acylation. Structural and electrochemical data of these compounds are presented.

zeitschrift für naturforschung b

7-Azoniafluorenonderivate durch elektrostatisch aktivierte S N Ar-Reaktionen / 7-Azoniafluorenone Derivatives by Electrostatically Activated S N Ar-Reactions