13. Complete each of these following reactions (i.e. fill in the boxes with the missing reagent(s) or major product(s). Indicate the stereochemistry if applicable.

4. Provide the major products (racemic mixture) formed in the reaction below and identify the stereochemistry names. (R/S notation) of these products and provide their IUPAC HBr

K Curved arrows are used to illustrate the flow of electrons. Follow the curved arrows and draw the structure of the missing reactants, intermediates, or products in the following mechanism. Include all lone pairs. Ignore stereochemistry. Ignore inorganic byproducts. H. H. THE BH₂ BH₂ Draw Major Borane Intermediate Problem

3.Complete the reactions below by drawing the major product or products. Indicate product stereochemistry where appropriate. Do not draw mechanisms or minor products. If the major products are produced in equal amounts, provide both products. If the products are racemic, write (+/-) next to the products.

3. Draw the structure of the major organic product that forms in each of the following reactions Specify stereochemistry where appropriate. a) b) c) ð CH₂O Br Br 1) PhyCNa/Ether 2)CH₂l Oso (cat) (CH₂N-O2H₂O pyridine/'BuOH/H₂0 OCH, 1) DIBAL (excess) -78°C -rt/3h 2) MnO₂/ CH₂C 11/3h

4. For the following reaction, draw a reasonable mechanism showing stereochemistry Br-Br

Draw the structure of the major organic product of the following reaction.

Complete the reaction scheme below with the missing structure and any other necessary reagents. You can ignore stereochemistry. Each box must be one synthetic step (i.e., one reaction), but some reactions are 2- or 3-part reactions (e.g., reactions that require a work-up step). A reaction that is one synthetic step, but includes multiple parts, should be shown with i), ii), and/or iii) in the same box. step 1 step 2 PBR3 (step 3) ii) H30* step 4 (step 5) HO. step 6

4

This is part of an E1/E2 assignment. Essentially, what should go into each box? Include the curved arrow notation.