Negishi, Eiichi et al. published their research in Tetrahedron Letters in 1992 | CAS: 17920-23-9

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Reference of 17920-23-9

Cyclic cascade carbopalladation reactions as a route to benzene and fulvene derivatives was written by Negishi, Eiichi;Harring, Lori S.;Owczarczyk, Zbyslaw;Mohamud, Mohamud M.;Ay, Mehmet. And the article was included in Tetrahedron Letters in 1992.Reference of 17920-23-9 This article mentions the following:

Palladium-catalyzed cyclization of appropriately structured triynes, haloalkenyldiynes, or haloalkenylalkyne-alkyne mixtures can provide the corresponding benzene derivatives, while the Pd-catalyzed intermol. reaction of diynes with alkenyl halides can give fulvene derivatives Thus, MeCCCH2OCH2CCCH2CR(CO2Et)2 (I, R = CH2:CBrCH2) was treated with Et3N in MeCN in the presence of Pd(PPh3)4 to give 85% the cyclopentabenzofurandicarboxylate II. Similar treatment of I (R = HCCCH2), but using 5% AcOH instead of Et3N gave 67% II. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Reference of 17920-23-9).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Reference of 17920-23-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics