Synthesis, Characterization and Biological Study of Some Chalcones derived from Terphthaldehyde

2022

AJRC

The main aim of present work was to develop eco-friendly and green method for synthesis of 3-benzylidene-2-phenylchroman-4-one derivatives. For the synthesis of 3-benzylidene-2-phenylchroman-4-one derivatives variety of acid and base catalyzed methods was performed. HCl gas and p-TSA proved ineffective as catalyst. Concentrated HCl in n-butanol was very less effective method. Upon taking base catalyst, by product was formed when taking NaOH as catalyst and very low yield obtained using piperidine as catalyst. To overcome this problem, novel and eco-friendly method was developed in which barium hydroxide used as a base catalyst. In presence of ethanol product yield drastically increased. Main benefit of this method is reaction carried out by gradual trituration and very less amount of solvent was required. By using this method, product obtained in very high yield with more purity.

A novel and eco-friendly method for Synthesis of 3-benzylidene-2-phenyl chroman-4-one analogs

Patadiya¹,

2022

AJRC

An optimized method for synthesis of 2’hydroxy chalcone

Patadiya¹,

2022

AJRC

The main aim of present work is to develop optimised method for synthesis of 2’hydroxy chalcone. 2’hydroxy chalcone was synthesized by Claisen–Schmidt condensation between o-hydroxy acetohenone and benzaldehyde. Variety of bases tried as catalyst for synthesis of 2’hydroxy chalcone. Calcium hydroxide and magnesium hydroxide proved ineffective for synthesis. Lithium hydroxide slightly converts reactant to product. Sodium hydroxide shows best catalytical activity compare to other bases. Isopropyl alcohol proved better solvent then other solvents like methanol, ethanol, acetonitrile, dichloromethane and tetrahydrofuran. In optimization step, effect of solvent and base quantity, stirring time and temperature was examined. Temperature shows drastic effect on product yield and purity. At 0˚C best yield was obtained. Amount of base catalyst also shows significant effect on yield. 20ml of 40% NaOH gives best results for 0.05mol reactants. 50ml IPA was needed for the best results for 0.05mol reactant. In approximate 4h, reaction should be completed. Further stirring was not too much effective.

An efficient method for Synthesis of flavanone

Patadiya¹,

2022

AJRC

The main aim of present work is to develop efficient method for synthesis of flavanone. For the synthesis of flavanone acid and based catalyzed methods were tried in which base catalyzed methods proved ineffective. No reaction was take place upon using HCl, H2SO4, glacial acetic acid and p-TSA as catalyst. In presence of methane sulphonic acid as catalyst, flavanone was formed in lower yield. Mixture of sulfuric acid and glacial acetic acid proved better catalyst than previous ones and leads to 65% yield. The reaction condition parameters effects on product yield were carried out. Ratio of sulfuric acid and glacial acetic acid in (4:1) proved highly beneficial. In methanol product yield was higher compare to other selected solvents. Solvent quantity effect on yield was also screened which proved that 50ml solvent necessary for 0.004mol of reactant. From which 90˚C temperature was highly favorable to reaction that takes minimum 6hr to complete the reaction. So, in this study we developed new efficient method for synthesis of flavanone.