The 1-propynyl group has the structure CH3-C≡C–R.[2]
The 2-propynyl group is also known as a propargyl group, and has the structure HC≡C−CH2–R.[3]
^Colthup, Norman B.; Daly, Lawrence H.; Wiberley, Stephen E. (1990-01-01), Colthup, Norman B.; Daly, Lawrence H.; Wiberley, Stephen E. (eds.), "CHAPTER 6 - TRIPLE BONDS AND CUMULATED DOUBLE BONDS", Introduction to Infrared and Raman Spectroscopy (Third Edition), San Diego: Academic Press, pp. 235–246, ISBN978-0-12-182554-6, retrieved 2023-01-01