Construction of [4.3.1]Propellanes via Molybdenum Fischer Carbene Complexes was written by Bertolini, Thomas M.;Nguyen, Que Huong;Harvey, Daniel F.. And the article was included in Journal of Organic Chemistry in 2002.Category: esters-buliding-blocks This article mentions the following:
Cyclization of molybdenum Fischer carbene complexes, e.g. I, with methyleneoctenynes, e.g. II, at 40° gave tricyclodecadienes, e.g. III, with yields of 24-54%, while the analogous chromium carbene complex gave no reaction. The range of dienyne substrates that participate in this reaction is explored and its mechanism is analyzed and discussed. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Category: esters-buliding-blocks).
Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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. Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics