That reaction relies on the terminal variety of this functionality, which can be synthesized by reacting an aldehyde with triphenylphosphine and a geminal dihalide on an alkenyl carbon.
One modification of a reaction used to synthesize this functionality uses dimethyl 1-diazo-2-oxopropylphosphonate, also known as the Ohira-Bestmann reagent, and an aldehyde. The original reaction uses a ketone and is a low temperature, base-promoted homologation named for Seyferth and Gilbert. Two molecules containing this functionality can be coupled end-to-end in another reaction named for Eglinton. That reaction relies on the terminal variety of this functionality, which can be synthesized by reacting an aldehyde with triphenylphosphine and a geminal dihalide on an alkenyl carbon. Created by the Corey-Fuchs reaction, for 10 points, name this functional group containing two pi and one sigma bonds between carbon atoms.
One modification of a reaction used to synthesize this functionality uses dimethyl 1-diazo-2-oxopropylphosphonate, also known as the Ohira-Bestmann reagent, and an aldehyde.
alkynes