7-Hydroxy-6-methylheptan

Two propanoate units (see Fig. 2) seem to be coupled in 1-ethylpropyl (2S,3.R)-2-methyl-3-hydroxypropanoate 221, the male produced aggregation pheromone of the granary weevil, Sitophilus granarius [390-393]. Even the ester-moiety may origin from two propanoate units after decarboxylation and reduction Three propanoate units (and decarboxylation, see Fig. 2) may produce (4S,5 )-5-hydroxy-4-methyl-3-heptanone, sitophilure 222, the aggregation pheromone of the rice weevil, Sitophilus oryzae [394, 395]. The same carbon skeleton is present in the achiral 4-methylheptan-3,5-dione 223, the pheromone of the pea weevil, Sitona lineatus [396-398]. 

C10H2002 7-hydroxy-3,7-dimethyl octanal 107-75-5 473.73 41.366 2 21161 C10H22 4-ethyl-4-methylheptane 17302-04-4 433.96 37.321 1.2... 

Cholesterol (koh-LESS-ter-ol) is also known as cholesterin cholest-5- - - 5-cholestin-3-P-ol 3P-hydroxy-5-cholestene and io,i3-dimethyl-i7-(6-methylheptan-2-yl)-2,3,4,7,8,9,n,i2,i4, i5,i6,i7-dodecahydro-iH-cyclopenta[a]phenanthren-3-ol. It is a waxy white or pale yellow solid with virtually no taste or odor. It is present in the bodies of all higher animals, especially in the brain and spinal cord. Chemically, cholesterol is classified as a fat, a member of the lipid family. Fats are the product of the trihydric alcohol (alcohol with three -OH groups) glycerol and a fatty acid. Fatty acids are organic acids with many carbon atoms, usually eight or more. 

The prefixes for the —OH and —NH2 substituents are hydroxy and amino respectively. Thus, the name of molecule (b) is 5-hydroxy-6-methylheptan-2-one. 

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