methylene group

…next by a CH₂ (called methylene) group. (2) Virtually all double bonds in these and other naturally occurring unsaturated fatty acids have the cis configuration. (3) Linoleic and linolenic acids are needed by the human body, but the body cannot synthesize them. They must be obtained in the diet and,…

…synthesis) is feasible because a methylene group connected to two carbonyl groups (as in diethyl malonate) is somewhat more acidic than similar groups connected to only one carbonyl group and can lose a hydrogen ion to a strong base such as sodium ethoxide (C₂H₅ONa). When heated with urea and sodium…