Microwave-assisted synthesis of 14-aryl-14H-dibenzo[a.j]xanthenes catalysed by methanesulfonic acid under solvent-free conditions

A DABCO Derived Ionic Liquid Based on Tetrafluoroborate Anion: Preparation, Characterization and Evaluation of its Catalytic Activity in the Synthesis of 14-Aryl-14H-dibenzo[a, j]xanthenes

“…No product was obtained in the absence of the catalyst (entry 1) and only a trace amount of the product was obtained in the presence of the catalyst at room temperature (entry 5) indicating that the catalyst and temperature are necessary for the reaction. Increasing the amount of the catalyst and reaction temperature up to 3 mol % (based on 4-chlorobenzaldehyde) and 100 °C, respectively, increased the yield of the product 3e, whereas further increase in both catalyst amount and temperature was found to have an inhibitory effect on the formation of the product (entries [10][11][12][13][14].…”

Preparation, Characterization and First Application of Alumina Supported Polyphosphoric Acid (PPA/Al2O3) as a Reusable Catalyst for the Synthesis of 14-Aryl-14H-dibenzo[a, j]xanthenes

“…19 Furthermore, 14-aryl-14H-dibenzo[a, j]xanthenes and their analogues were prepared by reaction of β-naphthol with 2-naphthol-1-methanol, 20 formamide, 21 carbon monoxide 22 as well as by condensation of β-naphtol with aldehydes using various acid catalysts. [23][24][25][26][27] Many of these methodologies, however, suffer from disadvantages such as unsatisfactory yields, expensive catalysts, long reaction times, toxic organic solvents, and harsh reaction conditions. Therefore, the development of simple, efficient, high-yielding, and environmentally friendly methods using new catalysts for the synthesis of these compounds is still necessary.…”

Solvent Free, One Pot Synthesis of Symmetric Xanthene Dyes and Their Electrochemical Study

“…Xanthene dyes are extremely important class of dyes because of their wide range of biological and pharmaceutical properties, such as agricultural bactericide activity 1 , anti-inflammatory and anti viral 2 , antioxidant 3 , anticancer 4 , cytotoxic 5 and antiproliferative properties 6 . These are being utilized as antagonists for paralyzing action of zoxazolamine 7 and in photodynamic therapy 8,9 .…”