They are converted to cisÂ­alkenes by Lindlar palladium.
A homologation reaction which generates these compounds proceeds through an unstable vinyl carbene intermediate; aryl aldehydes are added to diazomethyl phosphonate derivatives in that reaction named for Seyferth and Gilbert. Molecules that contain an alkene and two of this functional group can cyclize to form a reactive paraÂ­benzyne biradical, which is quickly quenched in a reaction named for Bergman. These compounds can be deprotonated by sodium amide and reacted with ketones to form their alphaÂ­hydroxy derivatives; that transformation requires the (*) terminal variety of these compounds with pKa values around 22 to 25. They are converted to cisÂ­alkenes by Lindlar palladium. The simplest of these compounds combusts at 2500 degrees Celsius in air, which explains its use in welding torches; that is acetylene. For 10 points, name these compounds with carbonÂ–carbon triple bonds.
A homologation reaction which generates these compounds proceeds through an unstable vinyl carbene intermediate; aryl aldehydes are added to diazomethyl phosphonate derivatives in that reaction named for Seyferth and Gilbert.
alkynes 