Ultrasonic-Assisted condensation of aromatic and aliphatic aldehydes with 3-(Thiophen-2-yl)-5-Pyrazolone: Synthesis, characterization and Stereoselective application was written by Rizk, Hala F.;Noser, Ahmed A.;Ibrahim, Seham A.;Fares, Amira K.. And the article was included in Journal of Heterocyclic Chemistry.Electric Literature of C9H10O3S This article mentions the following:
A green and efficient protocol for a one-pot condensation of 1-(2,4-dinitrophenyl)-3-(thiophen-2-yl)-1H-pyrazol-5(4H)-one with aromatic and aliphatic aldehydes in different ratios to synthesize novel heterocyclic compounds containing pyrazolone and pyranopyrazole moieties was developed. The reactions were conducted using the ultrasonic and traditional methods. The sonication ensured more efficiency in the rate and yield of the reactions. The structures of the synthesized compounds were elucidated by different spectroscopic methods. Addnl., an enantioselective synthesis of (R)- and (S)-α-alkylated acid was achieved using 1-(2,4-dinitrophenyl)-4-(hydroxymethyl)-3-(thiophen-2-yl)-1H-pyrazol-5(4H)-one as chiral auxiliary, (S)-4-methyl-5-nonanol the aggregation pheromone of red palm weevil was efficiently prepared and used for trapping the red palm weevil. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Electric Literature of C9H10O3S).
Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Electric Literature of C9H10O3S
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics