1) Draw the complete electron-pushing arrow mechanism for the following reductions. Explain, using resonance contributors (structures), the regiochemistry that results in each case. OMe Na, MeOH ? NH3 CHO Na, MeOH ? NH3

4. Give the starting alkene and any other reagents needed to selectively make the following compounds (with no organic byproducts!): OH L Eto OH all OH Br Br Br

The main product of the reduction of 3-ethyl-2-pentanone, in the presence of LIAIH4 as catalyst, is: bv) CH–CH2CH CHI CHO CH-CH₂ cx) CH-CH₂-CH-0-CH3 1 CH₂ CH3 VALAISUU, US OH KHI CHICH, CHÍCH CHO CH-CH3 Ik) CH,CH, CH, CH, COO CHI CH

Need help with question.

i’m really confused on these drawing questions as i don’t know how the two catalysts will change the structure

Draw all alkenes formed from alkyl halide, and predict the major product

2) a. In the synthesis of Camptothecin, a potent antitumor and antileukemic agent isolated from the stem wood of a Chinese Nyssaceae tree, the following conversion is made. Come up with a reasonable mechanism for the following conversion using proper electron pushing and reasonable chemistry. CHO NH₂ of me N-CO,Et -CO₂Et NaOH, aq EtOH R₂NH b. The following reaction is an example of Mannich reaction. Please write a reasonable mechanism. HiH N-CO,Et -CO,H H R₂N H

Give the major product of the following reaction. 1) ВН3/THF 2) H202, NaOH

1. Complete the following transformation, show step-by-step scheme "iy" H H H AND

Indicate the reagents and conditions to perform the following transformations.