5. Predict the MAJOR product and provide the mechanism for the following r formation of the electrophile and any relevant resonance structures (of the E Note: do not use water in any step in this mechanism. HO AIC13
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- The answer choices for part b ["How would you convert the alkene to a epoxide?"] are: (a) Br2/NaNH2 in liq NH3; (b) mCPBA; (c) OsO4Thank you!Br Brz CH3 CH3 H3C CH2CI2 H3C Br Electrophilic addition of bromine, Br2; to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH,Cl). In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Br: :Br: .CH3 H3C H3C CH3 Br:If anhydrides react like acid chlorides with the nucleophiles, draw the products formed when each of the following nucleophiles reacts with benzoic anhydride [(C6H5CO)2O]: (a) CH3MgBr (2 equiv), then H2O; (b) LiAlH4, then H2O; (c) LiAlH[OC(CH3)3]3, then H2O.
- TReferences] Indicate, by letter(s), the position(s) on the ring at which substitution occurs when the aromatic compounds shown undergo bromination with Br, FeBr3 (when necessary). .H CN HOShow a possible mechanism for the following reaction 1) EtMgBr (еxcess) 2) H20 Et OH Me •Me "Et w..b) Listed below are several hypothetical nucleophilic substitution reactions. None is synthetically useful because the product indicated is not formed at an appreciable rate. In each case provide an explanation for the failure of the reaction to take place as indicated. OMe HO + OMe + OH HO + CH; OH
- For the following dehydrohalogenation (E2) reaction, draw the major organic product(s), including stereochemistry CI (Cн Сок СH, HII (Cн, СОнSuggest a reasonable mechanism for the reaction shown Br here. HO CH;CH,OH.Which one of the following molecules can react as electrophile in reactions with alkenes? CH3OH NaCI HCI KCN NaCI O HCI O KCN O CH3OH
- Complete the following addition reaction by providing the missing product after protantation. Indicate regiochemistry and stereochemistry when relevant. NaOH OA. но он Но он OC. но OH B.N(CH2CH3)3 + HNO3 --------> a.) rewrite the reaction using bond-line structure of reagents and products of the reaction b.) supply the curved arrows explaining the mechanism of the reaction9. Draw the structure of product, substrate or condition in the following reactions (should clearly show the stereochemistry). Ме 12, KI, NaHCO3 OH a) Ме C3H13021 Ме BH3 "Me b) then H2O2, NaOH OH Ме Br2, H20 c)