Drawing Resonance Structures via Pattern Recognition

24 In each case below, draw the curved arrow(s) required in order to convert the first resonance structure into the second resonance structure. In each case, begin by drawing all lone pairs, and then use the formal charges to guide you. 

We will now explore each of these five patterns, with examples and practice problems. 

An allylic lone pair. Let s begin with some important terminology that we will use frequently throughout the remainder of the text. When a compound contains a carbon-carbon double bond, the two carbon atoms bearing the double bonds are called vinylic positions, while the atoms connected directly to the vinylic positions are called allylic positions  

We are specifically looking for lone pairs in an allylic position. As an example, consider the following compound, which has two lone pairs  

We must learn to identify lone pairs in allylic positions. Here are several examples  

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