Chapter 17, Problem 26P

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4. Unsaturated fatty acids are fatty acids that contain one or more double bonds. Double bonds can form by dehydration reaction as demonstrated below. Propose a one-step mechanism for an enzymatic dehydration reaction using histidine and aspartic acid side chains. H OH O ACP `ACP

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2. Provide arrow-pushing mechanism for the following reaction. OCH3 HA

1. Draw the structure of the products in the provided boxes. Хон E1 3% 33% 64%

6. Geosmin is a volatile molecule synthesized by a soil organism. The characteristic ‘after rain odor' is due to the release of Geosmin from the moist soil. The following reaction describes the formation of an intermediate from the biosynthesis of Geosmin. Provide arrow-pushing mechanism that accounts for the formation of this intermediate. Your mechanism should not explain the stereochemistry of the product H3O OPP OH

How much energy is released or absorbed when 40.0 g of steam at 250.0 C is converted to water at 30.0 C?           sp.ht. of water   4.18 J/gC                      ΔHfus of water is 333 J/g.                         sp.ht. of steam  2.03 J/gC                      ΔHvap of water is 2260 J/g

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