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Concept explainers
Interpretation:
In the given nucleophiles, thestronger nucleophile in a
Concept introduction:
Electrophiles are electron-deficient species, which has positive or partially positive charge. Lewis acids are electrophiles, which accept electron pair.
Nucleophiles are electron-rich species, which has negative or partially negative charge. Lewis bases are nucleophiles, which donate electron pair.
A chemical species thathas the tendency to donate an electron pair to an electrophile in order to form a
The polar solvent in absence of acidic is known as polar aprotic solvent.
The polar solvent in presence of acidic hydrogen, which is bonded to oxygen or nitrogen atom in order to form hydrogen bonding is known as polar protic solvent.
If lone pair of electron is present on more electronegative atom, it cannot donate electron pair easily. It is considered as weak nucleophile.
Less electronegative atom can easily donate electron.
If a nucleophile can easily donate electron to electrophile then it is considered as strong nucleophile.
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Chapter 6 Solutions
Organic Chemistry, 12e Study Guide/Student Solutions Manual
- 1 Consider the reaction of (R)-2-chloro-3-methylbutane with sodium iodide to form aproduct.(a) Draw the reaction scheme with the correct stereochemistry (reactant + NaI → product+ NaCl). Circle the nucleophile and draw a rectangle around the electrophile.(b) What is the symbol used for mechanism shown in 1(a)(c) If the sodium iodide was replaced with sodium hydroxide, the product is anALKENE. Draw a reaction MECHANISM to show how this happens.(d) Draw the reaction energy diagram for the reaction in 1(c) and label the activationenergy. (e) Using any alcohol with five carbons, and any carboxylic acid with six carbons, draw areaction to show how we would make an ester.(f) Describe the practical on esters. Please answer (d) to (f)arrow_forwardThe following two sets of reactions, ((a) and (b)), show possibilities for arrow pushing in individual reaction steps. Identify which is wrong and explain why. Next, using the correct arrow pushing, label which molecule is the nucleophile and which is the electrophile. (a) (b) H3C :Cl: H3C H,c-i: – →: I-CH3 + :Cl: C-C: H3C / H3C H3C-Cl: C-CH3 H3C : H,C-Cl: H3C-CI: →: I-CH3 + :Cl: H3C :Cl: H3C C-CH3 C-CI: H3C/ H3C H3Carrow_forwardProblems 8.29 Give the mechanistic symbols (SN1, SN2, E1, E2) that are most consistent with each of the following statements: (a) Methyl halides react with sodium ethoxide in ethanol only by this mechanism. (b) Unhindered primary halides react with sodium ethoxide in ethanol mainly by this mechanism. (c) When cyclohexyl bromide is treated with sodium ethoxide in ethanol, the major prod- uct is formed by this mechanism. (d) The substitution product obtained by solvolysis of tert-butyl bromide in ethanol arises by this mechanism. (e) In ethanol that contains sodium ethoxide, tert-butyl bromide reacts mainly by this mechanism. (f) These reaction mechanisms represent concerted processes. (g) Reactions proceeding by these mechanisms are stereospecific. (h) These reaction mechanisms involve carbocation intermediates. (i) These reaction mechanisms are the ones most likely to have been involved when the products are found to have a different carbon skeleton from the substrate. (j) Alkyl…arrow_forward
- (a) Which of the following phenols is the least acidic? (b) Which of the following phenols is the most acidic?arrow_forward7.44 Give the structures of two different alkyl bromides both of which yield the indicated alkene as the exclusive product of E2 elimination. (а) СH;CH—CH, (b) (CH3)2С—СH2 (c) BRCH=CB12 CH3 (d) CH3arrow_forward(a) Which of the following will NOT produce a carboxylic acid or carboxylate ion? 1-butanol + H2CrO4 2-butene + O3/H2O2 butanal + PCC butanal + H2CrO4 (b) Which of the following will NOT produce a carboxylic acid or carboxylate ion? 1-butanol + H2CrO4 2-butene + O3/H2O2 butanal + PCC butanal + H2CrO4arrow_forward
- 4.33 Select the compound in each of the following pairs that will be converted to the corresponding alkyl bromide more rapidly on being treated with hydrogen bromide. Explain the reason for your choice. (a) 1-Butanol or 2-Butanol (b) 2-Methyl-1-butanol or 2-butanol (c) 2-Methyl-2-butanol or 2-butanol (d) 2-Methylbutane or 2-butanol (e) 1-Methylcyclopentanol or cyclohexanol Draw the energy diagrams of an SN1 reaction and an SN2 reaction. Include in your drawing anexample reaction. Identify the rate limiting step and label it as unimolecular or bimolecular.arrow_forward7.53 Write a sequence of steps depicting the mechanisms of each of the following reactions. Use curved arrows to show electron flow. H+ (a) ОН ОН (b) H2SO4. heat ОН KHSO4 (c) 170°Carrow_forward7.26 Predict the principal organic product of each of the following reactions. Specify stereochemistry where appropriate. ONa (a) (b) (c) (d) (e) (1) (g) (h) e (j) L OH (1) H- Br + + OH OCH3 Br Br CoHs ONa NaOH NaN3 dioxane-water Ao fo X A Br NH3 methanol HCI CHC13 -CH3 CH,SNa -H OOH (k) CH₂(CH₂)₁6CH₂OTS + CH3CH₂CH₂CH₂SNa → CGHS CH₂ONa CH3OH 1. LIAIH, diethyl ether 2. H₂O K₂CO3 acetonearrow_forward
- • PRACTICE PROBLEM 8.12 Treating a hindered alkene such as 2-methyl-2-butene with BH3:THE leads to the for- mation of a dialkylborane instead of a trialkylborane. When 2 mol of 2-methyl-2-butene is added to 1 mol of BH3, the product formed is bis(3-methyl-2-butyl)borane, nicknamed in reagent "disiamylborane." Write its structure. Bis(3-methyl-2-butyl)borane is a useful certain syntheses that require a sterically hindered borane. (The name “disiamyl" comes from "disecondary-iso-amyl," a completely unsystematic and unacceptable name. The name "amyl" is an old common name for a five-carbon alkyl group.) donbyarrow_forwardWhen tert-butyl bromide is heated with an equal amount of ethanol in an inert solvent, one of the products is ethyl tert-butyl ether. (a) What happens to the reaction rate if the concentration of ethanol is doubled?arrow_forwardThe following two sets of reactions [(a) and (b)] show possibilities for arrow pushing in individual reaction steps. Identify which is wrong and explain why. Then using the correct arrow pushing, label which molecule is the nucleophile and which is the electrophile. (b) H3C (a) i-CH3 + :F H3C C-CI: H3C--Ci: C-CH3 H3C H3C H3C .. H3C-CI :I-CHg + :Cl: :Cl: H3C H3C 1. C-CH3 C-C1: H3C H3C .. H3Carrow_forward
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