14- 12 Ether formation .. r"'.. H+ CH3CH2CH2-�.H Dehydration H nl+ CH3CH2CH2 - O -H 4 '--.... H� -CH2CH2CH3 .. � H20 H ••( 1 + CH3CH2CH2 -� -CH2CH2CH3 H nl+ CH3CHCH2 -° -H I..) .. H� H2� -Remember I:!.G = M/-TM? Thermodynamics of a reaction depend on the sign and magnitude of AG. As temperature increases, the entropy term grows in importance. In ether formation, the I:!.S is small because two molecules of alcohol give one molecule of ether plus one molecule of water-no net change in the number of molecules. In dehydration, however, one molecule of alcohol generates one molecule of alkene plus one molecule of water-a large increase in entropy. So TI:!.S is more important for dehydration than for
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