17. What is the Aldol addition product formed from reaction of the following compound with itself? О O IV م Br NaOEt, EtOH 84 8 III 1 point

15. Which of the following would react fastest in an elimination reaction using NaOMe/MeOH? First choice: Second choice: A OTS Br B C Br of D

18en the folbwng sequence of reac ond what wo structure of compound AT D (CH,,CULI 2) H,0 HN-CH, H,0 Select one 2.Wnchufthfollewine.comectly represert eet the stepm the rechnsnetamad altalcardensation react

Please complete this synthesis with an epoxide. Please draw it out and wxplqin each step. C HO NH₂

9) What is the product of the following intramolecular aldol condensation reaction? KOH, CH;OH H, H. heat CHO CHO B) D) A) D B) C C) A D) B

4. Predict the products for the following enolate reactions. a) LDA b) MeBr a) 0.95 equiv LDA RT b) MeBr a) 1.1 equiv LDA -78 C b) c) H3O+ H

Draw complete mechanism for Following reaction ²4 +453 4 benzaldehyde H pyrroles 1) BF 3• Ott 2 2) ODQ 2-I HIN O

Step 2: A hemiacetal formation has a similar mechanism to the hydrate reaction, except 1 equivalent of alcohol is added instead of water. 1² R₂ R₁ LOR3 R₁ R₂ The hemiacetal reaction is also reversible and can also be catalyzed by either acid or base. Hemiacetals are not usually isolated, except in the formation of 5- and 6-membered rings, as often seen in carbohydrate chemistry. Identify the hemiacetal formed from the intramolecular cyclization of the molecule shown. OH H OH R3OH OH OH OH CH₂OH NaOH ?

For the following reaction: H NaOH CH3CH₂OH a Draw the major organic product, assuming no dehydration of aldol product has occurred. ? ChemDoodleⓇ

Modify the given copies of the starting materials to draw the two ß-hydroxyaldehydes formed by mixed aldol reactions. H,C Edit Drawing ui A H₂C