Question

draw the curved arrows and the resulting resonance structure for the following structure. include lone pairs and charges in your structure.

Explanation:

1. Identify the electron source: the π bond in the double bond adjacent to the oxygen atom.
2. Draw a curved arrow from the π bond to the oxygen atom, which accepts the electron pair. This leaves the original carbon of the double bond with a positive formal charge.
3. Add a lone pair to the oxygen (now bearing a negative formal charge, as it has gained an electron pair) and show the positive charge on the carbon that lost the π bond electrons.
4. The resulting resonance structure has a single bond between the two former double-bond carbons, a negatively charged oxygen with three lone pairs, and a positively charged tertiary carbon.

Answer:

Curved Arrow Mechanism:

1. A curved arrow starts from the π bond of the C=C double bond and points towards the oxygen atom.

Resulting Resonance Structure:

A six-membered ring where:

• The oxygen atom has three lone pairs of electrons and a -1 formal charge.
• The carbon that was originally part of the double bond (and attached to the methyl group) has a +1 formal charge, and is now singly bonded to its adjacent ring carbon.
• All other single bonds in the ring remain intact, and the methyl group is still attached to the positively charged carbon.

Structurally, it can be represented as:

     O⁻ (3 lone pairs)
     |
CH₃-C⁺-CH₂-CH₂-CH₂-O⁻ (ring structure, with the positive charge on the methyl-substituted carbon, and negative charge on the oxygen with an extra lone pair)

(Standard skeletal structure: six-membered ring, with one oxygen (with 3 lone pairs, -1 charge), a positively charged carbon bonded to CH₃, and single bonds connecting all ring atoms.)