Ojima, Iwao et al. published their research in Journal of the American Chemical Society in 1999 | CAS: 17920-23-9

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate

Rhodium-Catalyzed Intramolecular Silylcarbotricyclization (SiCaT) of Triynes was written by Ojima, Iwao;Vu, An T.;McCullagh, James V.;Kinoshita, Atsushi. And the article was included in Journal of the American Chemical Society in 1999.Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate This article mentions the following:

Intramol. silylcarbotricyclization of triynes is catalyzed by various Rhodium complexes. For example the triyne HCCCH2C(CO2Et)2CH2CCCH2C(CO2Et)2CH2CCH was reacted with PhMe2SiH in the presence Rh(acac)(CO)2 to give the cyclization products I, II, and III. A mechanism is proposed for these cyclizations which involves silicon-initiated carbometalation followed by subsequent carbocyclization and β-hydride elimination. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Diethyl 2-(prop-2-yn-1-yl)malonate

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