(a) In the products of Eq. 15.14, the observed stereochemistry at the ring fusion is not specified. Show this stereo chemistry, assuming that the Diels–Alder reaction gives the endo product.

(b) Sketch diagrams like the one in Fig. 15.10 (without the orbitals) that shows the approach of the diene and dienophile leading to both endo and exo products in part (a). Pay careful attention to the relative positions of substituent groups.

Transcribed Image Text:

stereocenters CH3 H H CH3 0 stereocenters H3C H H3C H Н or H3C H / H H3C H H (15.14)