Gold-catalyzed room-temperature cycloisomerisation of alkynes and unactivated enolizable ketones was written by Davies, Paul W.;Detty-Mambo, Christelle. And the article was included in Organic & Biomolecular Chemistry in 2010.Reference of 17920-23-9 This article mentions the following:
The cycloisomerisation of simple keto-alkynes proceeds at room temperature under the mild conditions of gold catalysis. Bicyclic fused compounds, e.g., I and spiro compounds, e.g., II can be obtained by overall 5-exo and 6-exo carbon-carbon bond-forming cyclisations. 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. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Reference of 17920-23-9
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics