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Alcohols Phenols and Ethers PowerPoint Presentation

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Published on : Dec 09, 2014
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Slide 1 - Alcohols, Phenols and Ethers Alcohol and Phenols have –OH group (hydroxyl functionality). Polar. The presence of the hydroxyl group makes them miscible with water The –OH group participates in H-bonding Alcohols up to C5 are very soluble in water. After that solubility decreases with increasing number of Carbon atoms Fundamentals of General, organic and Biological chemistry; McMurry et al., 5ed, Prentice Hall
Slide 2 - Alcohols
Slide 3 - Naming alcohols Start with the parent chain and replace the hydrocarbon –e ending with –ol Number the hydrocarbon chain. The carbon containing the –OH group should have the lowest number Number the position of the –OH group Number and name other side chains or functionalities using IUPAC rules                                               2-methyl-1-propanol 1-butanol
Slide 4 - Primary /secondary/tertiary                                          2-butanol A 2o alcohol (secondary) 2-methyl-2-propanol A 3o alcohol (tertiary)                                   1-propanol (1o alcohol) Distinguish the difference between 1o, 2o and 3o structures
Slide 5 - Nomenclature contd. In a cyclic alcohol, it is understood that the –OH group is on C-1
Slide 6 - Alcohols                                                      What is the identitity of this molecule?
Slide 7 - 2-isopropyl-5-methylcyclohexanol Menthol
Slide 8 - Alcohols (diols, triols) -diols or –triols mean two or three hydroxy groups in the molecule Number the hydroxy group carbons with the lowest possible numbers Prefix uses the full parent name, i.e butane                         , Ethane-1,2-diol (ethylene glycol) Propane-1,2,3-triol (glycerol)
Slide 9 - Properties of alcohols Alcohols are polar compounds because the –OH group participates in H-bonding Smaller straight chain alcohols are usually liquids Alcohols such as 1-heptanol (C8) tends to act more like alkanes Diols and triols have higher b.p’s and are more water soluble
Slide 10 - Reactions of alcohols Dehydration: Loss of water to form an alkene. Occurs in presence of acid catalyst Oxidation: In presence of oxidizing agents alcohols get oxidized to carbonyl compounds
Slide 11 - Dehydration reaction Fundamentals of General, organic and Biological chemistry; McMurry et al., 5ed, Prentice Hall
Slide 12 - Dehydration of alcohols Hint- More substituted alkene will be major product
Slide 13 - Dehydration of alcohols Predict the starting alcohol in the following: ? ? Write all possible structures then keep the most substituted ones!
Slide 14 - Oxidation *Note- Depending upon the alcohol and reaction conditions a different types and mixtures of carbonyl products may be formed Image Adapted from http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch15/ch15-4-6.html
Slide 15 - Oxidation of alcohols Secondary alcohols get converted to ketones upon oxidation but no further Q: What is oxidation reaction for a tertiary alcohol Image Adapted from http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch15/ch15-4-6.html
Slide 16 - Oxidation of alcohols ? ?
Slide 17 - Hydroxybenzene (a.k.a Phenol) Have been used as an antiseptic Many OTC sore throat medications contain substituted phenols Most phenols are somewhat water soluble BHA and BHT are often used as food preservatives BHA BHT
Slide 18 - Acidity of phenols Alcohols and Phenols are weakly acidic They dissociate in water to give the alkoxide or the phenoxide anion
Slide 19 - Phenols Methanol and Ethanols are as acidic as water, i.e weak acids, Ka = 10-15 Their anion (alkoxide ion) is a strong base, similar to the hydroxide ion Phenols are more acidic than alcohols Phenolic Ka is 1.0X 10-10
 


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