Chapter 9 Alkynes Organic Chemistry, 6th Edition L. G. Wade, Jr. Chapter 9 * Introduction Alkynes (a.k.a. acetylenes) contain a triple bond. General formula is CnH2n-2. Two elements of unsaturation for each triple bond. Some reactions are like alkenes: addition and oxidation. Some reactions are specific to alkynes. Chapter 9 Alkynes in Nature Chapter 9 * Nomenclature: IUPAC Find the longest chain containing the triple bond. Change -ane ending to -yne. Number the chain, starting at the end closest to the triple bond. Give branches or other substituents a number to locate their position. => Chapter 9 Chapter 9 * Name these: propyne 5-bromo-2-pentyne