A new avenue to the Dakin reaction in H₂O₂–WERSA

Abstract

We have developed a novel protocol to realize the Dakin reaction in H2O2–WERSA at room temperature and the system does not require activation, toxic ligand, additive/promoter, transition metal catalyst, base, organic solvent and so on.

Ethylene diamine post‐synthesis modification on open metal site Cr‐MOF to access efficient bifunctional catalyst for the Hantzsch condensation reaction

“…[34] Saikia et al synthesized MIL-101(Cr)-SO3H using a post-synthetic modification approach and employed as a heterogeneous catalyst for one-pot three component reactions. [35] Herein, in our current method, MIL-101(Cr) was prepared by using chrome nitrate and terephthalic acid in solvothermal conditions, which it was then activated at 423 K under vacuum to obtain OMS-MIL-101(Cr). Then, the OMS-MOFs reacted with ethylene diamine in ultra-dried toluene to coordination ethylene diamine to unsaturated Cr-cluster site of activated MIL-100(Cr) (Scheme 1).…”

Facile Synthesis of 3‐Hydroxy Oxindole by a Decarboxylative Aldol Reaction of β‐Ketoacid and Isatin in WERSA

“…Currently various bio‐source materials are used as un‐conventional medium like water extract of banana peels (WEB), water extract of papaya bark ash (WEPBA) and water extract of rice straw ash in the place of organic solvent . Water extract of rice straw ash (WERSA) is a highly mild green catalyst which can act as reaction medium as well . Rice straw is most abundant and easily available natural waste material in the world …”

“…[3] Water extract of rice straw ash (WERSA) is a highly mild green catalyst which can act as reaction medium as well. [4] Rice straw is most abundant and easily available natural waste material in the world. [5] Therefore, the medium from this waste material, to carry out organic transformation, has drawn much attention.…”

Efficient Hydration of Nitriles Promoted by Gallic Acid Derived from Renewable Bioresources

“…[12] An increasing number of chemistsa re drawing significant awareness to utilizen atural feedstocks as ac atalysto rp romoter in organic synthesis not only because of the abundance and environmentally benign nature of the renewable source, which are the cause for the majority of waste and pollution,b ut also because of the lower cost and lower energy requirements. [13] Amongt hem,g allic acid is awidespread natural polyphenolic compound with strong antioxidant activity, [14][15][16] and it can be extractedf rom vegetal sources such as fruits, nuts, and flowers. Free radicals can be effectively scavenged by the phenolic hydroxyl group, by which it can also act as ah ydrogen donor.…”