Organic Chemistry, 5th Edition H H L.G. Wade Jr Chapter 9 Alkynes Jo blackburn Richland college, dallas TX Dallas County Community College District c 2003. Prentice hall
Chapter 9 Alkynes Jo Blackburn Richland College, Dallas, TX Dallas County Community College District © 2003, Prentice Hall Organic Chemistry, 5th Edition L. G. Wade, Jr
H H Introduction Alkynes 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
Chapter 9 2 Introduction • Alkynes 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. =>
Nomenclature: UPAC H Find the longest chain containing the riple 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 3 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. =>
H H Name these CHC≡CH propyne CH-C≡C-CH2CH2-Br 5-bromo-2-pentyne CHCH-CH2C≡C-CH-CH3 2, 6-dime thyl-3-he pyne => Chapter 9
Chapter 9 4 Name these: CH3 CH CH3 CH2 C C CH CH3 CH3 CH3 C C CH2 CH2 Br CH3 C CH propyne 5-bromo-2-pentyne 2,6-dimethyl-3-heptyne =>
Additional functional H Groups All other functional groups, except ethers and halides have a higher priority than alkynes For a complete list of naming priorities look inside the back cover of your ter > Chapter 9
Chapter 9 5 Additional Functional Groups • All other functional groups, except ethers and halides have a higher priority than alkynes. • For a complete list of naming priorities, look inside the back cover of your text. =>