Which SN2 reaction will occur most rapidly? (Assume the concentrations and temperatures are all the same.) CH,O + + F* CH,0 + 1) O Option 3 O Option 2 CH, CH,O CH,O Option 1 Option 4
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Q: 2. Determine if the reaction below is SN1, SN2, or E2. Br H2O SN1 SN2 E2
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Q: OH c) E1 Reaction type
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- 1. SN1 or SN2 2. Draw major product withs steorchemistry 3. include reaction mechanismDraw the reactant RCHDBr with S absolute configuration, the draw the product of R’OH + RCHDBr (with S-configuration) through an SN2 reactions.Draw the mechanism ffrom benzaldehyde to this using: i)NaBH4 ii)TsCl, py iii)NaCN iiii)H+, H2O
- M 6 write the principal product in a, c & e and the neccesary reactives for b, d & f in the following reactions :A hydrocarbon of unknown structure has the formula C8H10. On catalytic hydrogenation over the Lindlar catalyst, 1 equivalent of Η2 is absorbed. On hydrogenation overa palladium catalyst, 3 equivalents of Η2 are absorbed. (a) How many degrees of unsaturation are present in the unknown structure? (b) How many triple bonds are Present? (c) How many double bonds are present? (d) How many rings are present? (e) Draw a structure that fits the data.Plastic photochromic sunglasses are based on the following reversible rearrangement of a dye inside the lenses that occurs when the lenses are exposed to sunlight. The original dye absorbs UV light but not visible light and is thus colorless, while the rearrangement product absorbs visible light and is thus darkened. (a) Show the mechanism of the rearrangement. (b) Why does the rearrangement product absorb at a longer wavelength (visible light) than the original dye (UV)?
- In addition to organic halides, alkyl tosylates (R'OTs. Section 9.13) also react with organocuprates (R2CuLi) to form coupling products R – R'. When 2° alkyl tosylatee are used as starting materials (R2CHOTs), inversion of the conguration at a stereogenic center results. Keeping this in mind, draw the product formed when each compound is treated with (CH3)2CuLi.In addition to organic halides, alkyl tosylates (R'OTs. Section 9.13) also react with organocuprates (R2CuLi) to form coupling products R – R'. When 2° alkyl tosylatee are used as starting materials (R2CHOTs), inversion of the configuration at a stereogenic center results. Keeping this in mind, draw the product formed when each compound is treated with (CH3)2CuLi.There are two isomeric cyclohexa-1,4-diene products when benzoic acid undergoes the Birch reduction (see Problem 25.24). (a) Draw the mechanism that leads tothe formation of the major product. (b) Will the Birchreduction of benzoic acid occur faster or slower than theBirch reduction of benzene itself? Hint: Is –CO2H anelectron-donating or an electron-withdrawing group?
- 1.Draw the structures of all 3 resonance hybrid forms of the benzenonium intermediatefor both o and p attack for the case of activating groups an indicate which one in eachcase is the most stable form.Draw the structure of all 3 resonance hybrid forms of the benzenonium intermediatefor m attack in the case involving a deactivating group. 2.Halogens are deactivating groups but direct electrophilic attack at the o and ppositions. Why is this the case?In addition to organic halides, alkyl tosylates (R′OTs) reactwith organocuprates (R2CuLi) to form coupling products R–R′. When 2°alkyl tosylates are used as starting materials (R2CHOTs), inversion of theconfiguration at a stereogenic center results. Keeping this in mind, drawthe product formed when each compound is treated with (CH3)2CuLi.Draw the products of attached SN2 reaction and indicate the stereochemistrywhere appropriate.