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- What carbonyl compounds might you start with to prepare the Following compounds by Grignard reaction? List all possibilities. (a) 2-Methyl-2-propanol (b) 1-Ethylcyclohexanol (c) 3-Phenyl-3-pentanol (d) 2-Phenyl-2-pentanolDraw structures corresponding to the following names: (a) Phenyl benzoate (b) N-Ethyl-N-methylbutanamide (c) 2,4-Dimethylpentanoyl chloride (d) Methyl 1-methylcyclohexanecarboxylate (e) Ethyl 3-oxopentanoate (f) Methyl p-bromobenzenethioate (g) Formic propanoic anhydride (h) cis-2-Methylcyclopentanecarbonyl bromideThe Darzens reaction invoIves a two-step, base-catalyzed condensation of ethyl chloroacetate with a ketone to yield an epoxy ester. The first step is a carbonyl condensation reaction, and the second step is an SN2 reaction. Write both steps, and show their mechanisms.
- Complete the following synthesis using any reagents of your choice: OMeSimePhco, MeMe7NH Br Ome on sime sime 3 Me ? E NH Ph ComeWhich of the following is expected to give a meso compound upon reduction with NaBH4 in methanol? COOH CHO A) B) H -OH H OH H -OH HO- -H CH2OH H- OH CH₂OH 0 A B CHO H- OH H- -OH H- -OH CH3 D) OHC OCH3 H3CO CHOIdentify which product corresponds to each number 1-4. OH Mes 1 OTS A OTS B {{ D TsCl imidazole Br S 8 E F LL F KBr DMF PMes DMF DMF H PMes "PMes PMey K PMe
- Propose a mechanism for the following reaction: OC u Fe. OC Fe Ph;P Ph;PWhat is the major product for the following reaction? SO₂H-O OC O a Od Ob X De MeOH [H₂SOA] m MeO enant I {-x {- OMe enantOHC O 6-formyl-2-hexanone O 5-acetylpentanal O 7-oxo-2-heptanone 6-oxoheptanal O 6-ketoheptaldehyde esc IDI fs f6 te @ %$4 % & 2 3 4 6. Q W R T F G 图 LL #M S
- Which is the most reactive carbonyl compound? ах 0= i 11 E ||| IVStep 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 ?What is the major organic product obtained from the following sequence of reactions? O C B Br A (CH3)3COK CH3CO3H H₂O H₂SO4 None of these A OH OH B D ||||OH OH OH OH