(A) This is the structure of stearic acid, an 18-carbon saturated fatty acid. The normal numbering system, starting with the carboxylic acid, is shown in blue. The carbons and oxygens of the ...

German organic chemist Julies Bredt argued in 1924 that a carbon double bond (the double line in the left image) could not occur as the branching positions of a small bicyclic molecule—one with ...