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- Provide the mechanism for the following reaction (1) PhMgBr (2 equiv) (2) H3O+ workup OH7A Write the possible products of the following reactions, the mechanism by which they were formed. mentioning Br CH3OH CH3ONa6-40 Give the substitution products expected from solvolysis of each compound by heating in ethanol. (a) (b) (c) Br (d) Br CI CH3 Br
- 51. Which is NOT a valid resonance structure for the conjugate base of this molecule? (A) (C) S (A) OEt O :O: : OEt HBr ROOR OCH 3 (B) 52. What is the major product of this reaction sequence? O PPh3 (D) 11 Mg ether (B) de OEt :0 aom Сосно LOCH 3 53. Which reagent is necessary for this transformation? (D) H OEt H OEt CH31 PPh3 ACS 56.Provide the major products for the following reactions?Which of the following compounds reacts most rapidly during halogenation?
- Draw curved arrows and identify the thermal and photochemical products of the electrocyclic reaction of (2Z,4Z,6E)-octa-2,4,6-triene. Step 2: An electrocyclic reaction will undergo a concerted electron shift to form a cyclic ring. A new sigma bond will be formed between carbons 2 and 7. The product will be neutral. (2ZAZ,6E)-octa-2,4,6-triene Draw the curved arrows to show the mechanism. Select Draw Rings More ErasePredict the most likely site(s) of electrophilic aromatic substitution. Mark the atoms clearly. (a) OCH, (b) OH (c) (d) OCH CI Br Br (e) NO2 (f) (g) NH2Predicts the major products for the following reaction.
- 1. At what position and on what ring would you expect the following substances to undergo electrophilic substitution? (b) CH3 Br lel CH3 2. Rank the compounds in each group according to their reactivity toward electrophilic substitution. (a) Chlorobenzene, o-dichlorobenzene, benzene (b) p-Bromonitrobenzene, nitrobenzene, phenol (c) Fluorobenzene, benzaldehyde, 0-xylene (d) Benzonitrile, p-methylbenzonitrile, p-methoxybenzonitrileA8The enamine prepared from acetone and dimethylamine is shown here in its lowest-energy form. (a) What is the geometry and hybridization of the nitrogen atom? (b) What orbital on nitrogen holds the lone pair of electrons? (c) What is the geometric relationship between the p orbitals of the double bond and the nitrogen orbital that holds the lone pair? Why do you think this geometry represents the minimum energy?