Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 1 14.1 Structure and Classification of Alcohols 14.2 Naming Alcohols, Phenols,

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Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings Structure and Classification of Alcohols 14.2 Naming Alcohols, Phenols, and Thiols 14.3 Some Important Alcohols and Phenols 14.4 Ethers Chapter 14 Alcohols, Phenols, Ethers, and Thiols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 2 Alcohols In an alcohol, a hydroxyl group (—OH) is attached to a carbon chain. In a phenol, a hydroxyl group (—OH) is attached to a benzene ring.

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 3  Alcohols are classified as primary, secondary, or tertiary.  Classification is determined by the number of alkyl groups attached to the carbon bonded to the hydroxyl. Primary (1º) Secondary (2º) Tertiary (3º) 1 group 2 groups 3 groups H CH 3 CH 3 | | |  CH 3 —C—OH CH 3 —C—OHCH 3 —C—OH | | | H H CH 3 Classification of Alcohols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 4 Classify each alcohol as 1) primary, 2) secondary, or 3) tertiary. OH | A. ___CH 3 —CH—CH 2 —CH 3 B. ___ CH 3 —CH 2 —CH 2 —OH C. ____HO—CH 2 —CH 2 —CH 2 —CH 2 —CH 3 Learning Check

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 5 Classify each alcohol as 1) primary, 2) secondary, or 3) tertiary. OH | A. 2 CH 3 —CH—CH 2 —CH 3 B. 1 CH 3 —CH 2 —CH 2 —OH C. 1 HO—CH 2 —CH 2 —CH 2 —CH 2 —CH 3 Solution

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 6  The IUPAC system replaces the -e in the name of the alkane main chain with –ol.  Common names for simple alcohols use the alkyl name followed by alcohol.  CH 4 methane CH 3 OH methanol (methyl alcohol)   CH 3 CH 3 ethane CH 3 CH 2 OH ethanol (ethyl alcohol) Naming Alcohols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 7  In the IUPAC names for longer chains, the chain is numbered from the end nearest the -OH group. CH 3 —CH 2 —CH 2 —OH 1-propanol OH | CH 3 —CH—CH 2 —CH 3 2-butanol CH 3 OH | | CH 3 —CH—CH 2 —CH—CH 3 4-methyl-2-pentanol Naming Alcohols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 8 OH | “rubbing alcohol”CH 3 —CH—CH 3 2-propanol (isopropyl alcohol) antifreeze HO—CH 2 —CH 2 —OH 1,2-ethanediol (ethylene glycol) OH | glycerolHO—CH 2 —CH—CH 2 —OH 1,2,3-propanetriol Some Typical Alcohols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 9 Name the following: A. CH 3 —CH 2 —CH 2 —CH 2 —OH OH CH 3 | | B. CH 3 —CH—CH—CH 2 —CH 3 C. Learning Check

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 10 A. CH 3 —CH 2 —CH 2 —CH 2 —OH 1-butanol OH CH 3 | | B. CH 3 —CH—CH—CH 2 —CH 3 3-methyl-2-pentanol C.cyclopentanol Solution

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 11 Write the structure of each of the following: A. 3-pentanol B. ethyl alcohol C. 3-methylcyclohexanol Learning Check

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 12 Write the structure of the following: A. 3-pentanol OH | CH 3 —CH 2 —CH—CH 2 —CH 3 B. ethyl alcohol CH 3 —CH 2 —OH C. 3-methylcyclohexanol Solution

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 13 Naming Phenols A phenol is a benzene ring with a hydroxyl group. For two substituents, assign C-1 to the carbon attached to the –OH. Number the ring to give the lowest numbers. The prefixes o, m, and p are used for common names.

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 14 Examples of Phenols

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 15 Phenols in Medicine Many phenols are used as antiseptics and disinfectants.

Copyright © 2004 Pearson Education Inc., publishing as Benjamin Cummings. 16 Derivatives of Phenol Compounds of phenol are the active ingredients in the essential oils of cloves, vanilla, nutmeg, and mint.