16. Conjugated Systems

Choose the product most likely to form during the following sigmatropic rearrangement: A molecule of $1_3$-butadiene undergoes a ${[}_{\mathrm{3,3}}$] sigmatropic rearrangement (Claisen rearrangement). Which of the following is the major product?

Provide the correct names and mechanisms for the following sigmatropic shifts

Provide the correct names and mechanisms for the following sigmatropic shifts

Provide the correct names and mechanisms for the following sigmatropic shifts

Provide the correct names and mechanisms for the following sigmatropic shifts