What are the first and the second mechanistic step for this SN1 reaction? CH;SH Br A Carbocation Formation, carbocation rearrangement B Carbocation formation, nucleophilic attack 5 Protonation, carbocation rearrangement D Protonation, nucleophilic attack
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- What is the first step in an SN1 reaction? Group of answer choices Attack of the nucleophile. Loss of the leaving group. Protonation of the leaving group.Why are SN1 reactions favored by polar protic solvents? Group of answer choices Polar protic solvents stabilize reaction intermediates Polar protic solvents cannot form hydrogen bonds. Polar protic solvents contribute leaving groups. Polar protic solvents contribute leaving groups.The use of curved arrows is a powerful tool that illustrates even complex reactions. a.Add curved arrows to show how carbocation A is converted to carbocation B. Label each new σ bond formed. Similar reactions have been used in elegant syntheses of steroids. b.Draw the product by following the curved arrows. This reaction is an example of a [3,3] sigmatropic rearrangement, as we will learn in Chapter 25.
- Draw an energy diagram for the following SN2 reaction. Label the axes, the starting materials, and the product. Draw the structure of the transition state.Type of leaving groups favorable for SN2 & SN1 reactions & 3 examples SN2 SN1Rank the nucleophiles in each group in order of increasing nucleophilicity. a.−OH, −NH2, H2O b.−OH, Br−, F− (polar aprotic solvent) c.H2O, −OH, CH3CO2−
- Create your own SN1 reaction and label the steps 1) heterolysis of leaving group 2) coordination of nucleophile 3) Proton transferConsider the series of the trans effect: CO, CN-, C2H4 > PR3, H-, CH3- > C6H5- > NO2-, SCN-, I- > Br- >Cl- > py > NH3 > H20 What would be the major product of the following reaction? Select one:How does the rate of an SN1 reaction change as the alkyl group in the substrate alkyl halide changes from CH3 1° 2° 3°?
- Match the questions with the correct descriptions below: Sn2, E2 E1cb Sn1, E1 (anti) E2, E1cb Sn1, E1 2 steps poor leaving group 2 carbons removed from a carbonyl group carbanion intermediate 3°>allylic, benzylic>2°>1°>CH₃ carbocation intermediate Ist order reaction (r=k[RX]) H-X anti no intermediate 2nd order reaction (r=k[RX][Nu]) polar aprotic solventWhich nucleophile would prefer simple addition over conjugate addition? CH3MgBr NaCN CH3CH2NH2 (CH3CH2)2CuLiDraw all resonance structures for the carbocation formed by ortho attack of the electrophile +NO2 on each starting material. Label any resonance structures that are especially stable or unstable.