Radical Allylic (Benzylic) Halogenation 1. Allylic and benzylic halogenation using X2 Allylic and benzylic bromination N-bromosuccinimide Reactions (NBS).
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Can you explain it? Provide examples with the various steps and explanations. How can I locate benzylic carbon? What about resonance structures?
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- Can you explain it? Provide examples with the various steps and explanations. How halogens affect the boiling/melting point? Does number of halogens affect it? For example, Ch3-Ch3 vs Ch3-Br vs Br-Ch3-Br5.Synthesis. Make the following products from a suitable cyclic alkene starting material. Look at the functional group PATTERN present in the molecule, including stereochemistry. Br BrCircle the electrophilic addition reaction(s) that form(s) a three-membered ring intermediate. a. Addition of hydrogen halides b. Acid-catalyzed addition of water c. Acid-catalyzed addition of alcohols d. Hydroboration-oxidation e. Addition of a halogen f. Addition of a peroxyacid g. Ozonołysis of alkenes h. Addition of hvdrogen
- Answer all questions please with as much detail as possible!Complete the following reaction scheme. 1. DIBALH 2. H3O+ TMSCI Pyridine 1. LIAIH(t-BuO)3 SOCI2 2. H3O+ CrO3 H3O+Which is a better nucleophile? a. Br− or Cl− in H2O b. Br− or Cl− in DMSO c. CH3O− or CH3OH in H2O d. CH3O− or CH3OH in DMSO e. HO− or −NH2 in H2O f. HO− or −NH2 in DMSO g. I− or Br− in H2O h. I− or Br− in DMSO
- How many moles of Bra are required to completely halogenate the alkene?A. One moleB. Two molesC. Three molesD. Four moles What is the expected arrangement of the bromine atoms relative to each other amongthe carbon involved in pi bonding?A. anti-conformationB. syn-conformationC. trans-configurationD. cis-configuration What happens to bromine when it is adjacent to an alkene during a chemical reaction?A. Bromine becomes stable. (? kasi before brown siya/acidic tas naging colorless? Jk ewan)B. Bromine becomes polarized.C. Bromine becomes hybridized.D. Bromine becomes acidic. The relative arrangement of bromine atoms in the product is primarily due to:A. ElectronegativityB. RepulsionC. Hydrogen bondingD. Atomic weightWhat is your observation after the reaction?A. A yellow flame is produced.B. Bromine water decolorizes.C. The alkene becomes denser.D. A brown precipitate forms.Provide the curved-arrow mechanism to account for the following nucleophillic addition-elimination reaction.As we will learn in Section 13.12, many antioxidants–compounds that prevent unwanted radical oxidation reactions from occurring–are phenols, compounds that contain an OH group bonded directly to a benzene ring. a. Explain why homolysis of the O–H bond in phenol requires considerably less energy than homolysis of the O–H bond in ethanol (362 kJ/mol vs. 438 kJ/mol). b.Why is the C–O bond in phenol shorter than the C–O bond in ethanol?
- [Review Topics] [References] Br H3C CH3 H3C H3C 1. Aqueous ethanol + HO +] H. CH3 H. CH3 BH3 O-BH3 f=Sn1 Nucleophilic substitution g = Sn2 Nucleophilic substitution a = Proton transfer d = El Elimination b Lewis acid/base e = E2 Elimination c = Electrophilic addition The rections above involve synthesis or reactions of alcohols and ethers. Identify the mechanism by which they proceed from among the mechanisms listed. Use the letters a - gf answers. 2.What is the rate-determining step in the mechanism of an electrophilic substitution reaction of benzene? Select one: OA. Attachment of the electrophile to benzene ring. OB. Bonding of catalyst to electrophile precursor. O C. Reformation of acid catalyst. OD. Formation of the electrophile. OE. Loss of H+ ion form arenium ion intermediate to reform aromatic ring.[Review Topics] [References] HO pyridine 1. SOCIl, + sO2 + H. Aqueous acetone H3C H20 H3C HBr 2. Br H OH optically active racemic f = SN1 Nucleophilic substitution g = SN2 Nucleophilic substitution a = Proton transfer d = E1 Elimination b = Lewis acid/base e = E2 Elimination c = Electrophilic addition The rections above involve synthesis or reactions of alcohols and ethers. Identify the mechanism by which they proceed from among the mechanisms listed. Use the letters a - g for your answers. 1. 2.