ChemInform Abstract: Syntheses of 4H‐Thiopyran‐4‐one 1,1‐Dioxides as Precursors to Sulfone‐ Containing Analogues of Tetracyanoquinodimethane

Abstract

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Mechanochemically synthesized LiAlOx catalyst for aqueous aldol condensation of furfural with acetone

“…Analysis of reaction products was performed by using gas chromatography (GC) on a Hewlett Packard 5890 Series II instrument equipped with a capillary column HP-1 (100 m × 0.25 mm, Agilent Technologies) and flame ionization detector. Identification of reaction products was carried out by comparing the retention times using authentic samples, which were synthesized by NaOH catalyzed aldol condensation as described elsewhere [9,[16][17][18][19].…”

“…Conventionally, NaOH and KOH are used as catalysts [16][17][18][19][20], but more complex systems such as pyrrolidine [21], zinc prolinate [22], L-lysine [23], prolinethioamide derivatives [24] and ionic liquids [25][26][27][28][29] are found to be able to catalyze the reaction. In most cases, the disadvantages are toxicity, difficult preparation, ability to hydrolyze in aqueous solutions, non-recyclability and high cost of the catalysts, generation of large amount of wastes, sometimes modest yields of target products.…”