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Alcohols. Complete Combustion of Alcohols IB Chemistry SL https://www.youtube.com/watch?v=8J9kif9KYuU&index=22&list=PL73D2B CC23E83D555 Oxidation reactions.

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Presentation on theme: "Alcohols. Complete Combustion of Alcohols IB Chemistry SL https://www.youtube.com/watch?v=8J9kif9KYuU&index=22&list=PL73D2B CC23E83D555 Oxidation reactions."— Presentation transcript:

1 Alcohols

2 Complete Combustion of Alcohols IB Chemistry SL https://www.youtube.com/watch?v=8J9kif9KYuU&index=22&list=PL73D2B CC23E83D555 Oxidation reactions of alcohols https://www.youtube.com/watch?v=vZozMauc_- 4&index=23&list=PL73D2BCC23E83D555 Oxidation of primary, secondary alcohols https://www.youtube.com/watch?v=iSc- Ypps_Io&index=24&list=PL73D2BCC23E83D555

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4 Cr 2 O 7 -2  Cr +3 Breath Analyzer detects ethanol

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6 Reactions of alcohols with carboxylic acids to form esters. State uses https://www.youtube.com/watch?v=v9pHSiPVqng&index=37&list=PL73D2BCC23 E83D555 Deduce structures of the polymers formed by alcohols and carboxylic acids https://www.youtube.com/watch?v=gNAqy4eAbMU&list=PL73D2BCC23E83D555 &index=39 ESTERIFICATION = CONDENSATION

7 Ester

8 Nucleophilic addition - Formation of alcohols The incoming nucleophile simply ‘pushes’ the electrons in the pi bond up to the oxygen. The oxygen acts as a base, abstracting a proton from a nearby acid group in the solvent ex: H 2 O Ketone Secondary alcohol R R

9 Carboxylic acids are REDUCED to primary alcohols H -, H 2 O CH 3 COOH + 2 [H]  CH 3 CH 2 OH Aldehydes are REDUCED to primary alcohols H -, H 2 O CH 3 CHO + 2 [H]  CH 3 CH 2 OH Ketones are REDUCED to secondary alcohols H -, H 2 O CH 3 COCH 3 + 2 [H]  CH 3 CHOHCH 3 Nucleophilic addition - Formation of alcohols with NaBH 4 or LiAlH 4

10 Nucleophilic addition - Formation of alcohols You need to know : The reducing agent (NaBH4 or LiAlH4) provides one H - which is nucleophilic while the solvent provides the second H The mechanism with curly arrows is not required


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