Dolbier HW Solutions 644

Dolbier HW Solutions 644 - 738 LIPIDS 26.14 By analogy to...

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26.14 By analogy to the reaction in which 7-dehydrocholesterol is converted to vitamin D 3 , the structure of vitamin D 2 can be deduced from that of ergosterol. 26.15 ( a ) Fatty acid biosynthesis proceeds by the joining of acetate units. Thus, the even-numbered carbons will be labeled with 14 C when palmitic acid is biosynthe- sized from 14 CH 3 CO 2 H. ( b ) As noted in Problem 26.6, arachidonic acid (Table 26.1) is the biosynthetic precursor of PGE 2 . The distribution of the 14 C label in PGE 2 biosynthesized from 14 CH 3 CO 2 H re f ects the fatty acid origin of the prostaglandins. ( c ) Limonene is a monoterpene, biosynthesized from acetate by way of mevalonate and isopen-
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