Question

2. Provide the structures for the carbonyl compound and phosphorous ylide combinations which could afford the following alkenes via stereoselective Wittig reactions. (1) 3. The addition of one or two molecules of an alcohol to a carbonyl species (such as an aldehyde of ketone) leads to the formation of a hemiketal or ketal, respectively. From what alcohol (or diol) and what carbonyl species might the following molecules have been prepared? (1) ОН 4. Identify the reactants needed to make each of the following imines. (2)

Answer 1

Ph. "Ht o * & A with PA ylide UN STABILI 2 ED YLIDE GIVES Z Product (che o anzen & Phe met in pha Cotabilized glide) gives alkene or they TH OH7 cet hy + ΑΝ