Terminal alkynes were readily obtained via the reaction of alkynoic acids with N,N,N',N'-teramethylethylenediamine (TMEDA) in DMSO at 65°C for 12 h. This method gave good yields and showed high functional group tolerance. In addition, deuterated terminal alkynes were formed in good yields when alkynoic acids were treated with D 2 O prior to the reaction with TMEDA.

The 1,3‐enyne product was obtained as a result of a decarboxylative homodimerization reaction when a variety aryl propiolic acids were reacted in the presence of Pd(TFA)2/i‐PrPPh2 and K2CO3. It was found that aryl propiolic acids bearing an electrondonating substituent provided the desired product; however, aryl propiolic acids an bearing electron‐withdrawing substituent did not give the desired product.

Arylpropiolic acids provided the corresponding arylalkynes via decarboxylation. This reaction was conducted with TMEDA under metal‐free conditions. When the reaction was carried out in the presence of D2O, the deuterated terminal alkynes were formed in good yields. More information can be found in the Communication by Eunkyeong Seo, Jonghoon Oh, and Sunwoo Lee.