1. In the rearrangement of 4,4-diphenylcyclocyclohex-2-enone to 5,6-diphenylbicyclo[3.1.0]hexan-2-one, there is a strong preference for formation of the endo phenyl stereoisomer. Offer an explanation...

1. In the rearrangement of 4,4-diphenylcyclocyclohex-2-enone to 5,6-diphenylbicyclo[3.1.0]hexan-2-one, there is a strong preference for formation of the endo phenyl stereoisomer. Offer an explanation for this stereoselectivity.

2. The photolysis of 16-A, 16-B, and 16-C has been studied. 16-A gives both 16-D and the cleavage product benzaldehyde. 16-B gives only 16-E. 16-C gives 16-B and benzaldehyde. Discuss how the presence of the t-butyl group and its stereochemistry can influence the reaction outcome.