Provide mechanisms and/or products for the following transformations.
a. Sometimes “Polyene” cyclization reactions can be catalyzed by a transition metal. Provide a mechanism for the reaction.
Section I. Tactics
Provide the appropriate reagents or product in the following examples.
1.
2.
3.
4.
5.
6.
7.
1.OsO4, TBHP, H2O/THF
Br
2. TsOH, acetone, PhH, heat
3. AlCl3, CH3COCl, CH2Cl2
1. BzOOBz, NBS, CCl4
2. Mg, THF; then Pd0Ln, PhBr
3. HNO3, H2SO4
4. Zn, HCl
1. Pd0Ln, Et3N, MeCN
2. NaBH4, MeOH 3. , Et3N, CH2Cl2 Cl
