D Why is this reaction so favourable? KOH Br A Elimination is always a favourable reaction A + KBг + H2O > B D The alkene is stabilised by conjugation with the benzene ring The favoured transition state is blocked by the phenyl ring The phenyl ring facilitates the reaction by helping the transition state
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- Zaitsev's Rule refers to: which alkene is favored in a product mixture O how resonance contributors stabilize cations/anions/radicals O the stereochemistry of reaction intermediates/transition states O the stability of carbocation intermediatesConsider the following reaction. CH3CH₂CH=CHCOH HCI CH3CH₂CH CHCOH c₁ CH3CH₂CH- H O CHCOH H CI this product is not observed Account for the fact that this reaction yields only a single product by drawing the carbocation intermediate leading to the observed product.4) Eto ₂ 5) 2-Cyclohexene-1-one O₂Et + ethylace to acetate NaOEt NaOEt
- Consider the following mechanism of reaction: CH3 CH, CH3 CH;C CH, + H-CI CH;CCH, + C: → CH;CCH, tert-butyl cation CI tert-butyl chloride In this reaction: The alkene and the carbocation intermediate are both nucleophilic HCl and CI" are both nucleophilic The alkene and HCI are both electrophilic The carbocation and CI" are both electrophilic The alkene and CI" are both nucleophilic AMeving to another question will save this responseDraw all of the substitution and elimination products formed from thegiven alkyl halide with each reagent: (a) CH3OH; (b) KOH. Indicate thestereochemistry around the stereogenic centers present in the products,as well as the mechanism by which each product is formed.Melamine, used as a fire retardant and a component of the writing surface of white boards, can be prepared from s-trichlorotriazine through a series of SNAr reactions with ammonia. The first substitution takes place rapidly at room temperature. The second substitution takes place near 100 °C, and the third substitution requires even higher temperature and pressure. Provide an explanation fatr this reactivity.
- 4. What are the products obtained from the following elimination reaction? Indicate the major product. CH;CH2CCH3 H2O CI 5. a) Determine the major product that is formed when the alkyl halide reacts with a hydroxide ion in an elimination reaction. CH;CH,CH,CH,CCH3 Br b) For the major elimination product obtained in 5a), which stereoisomer (cis or trans) is obtained in greater yield? Draw the two isomers and provide the names of the compounds.One of the products produced when is treated CH;CH, CH,-Č-NHCH; with NaOH is O CH3-NH2 O CH3-CH2-CH2-NH2 CH3-NH3*CI" CH;-CH, -C-NH,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:
- ) Starting from benzent synthesigo the fo lloning compounds. çooH NO2 NO2 NO2 NO2 Br9. Draw the constitutional isomer formed when the following alkenes are treated with each set of reagents: [1] H20, H2SO4; or [2] BH3 followed by H2O2, "OH. A io onutouTC.rvinmmoo ewo ebyoleen.g er besibhoyn motis M doso al waH s b. a. Seblaar molsHsno isq onol nose 2eob isticho to eqyt ewni.d Cnistnoo ennug 29ob anodogle yoam woH.o O bns 18 to alnemala erlT nertw bemot witam-S ae doue anexie leohtemmyeniCH3 CH3 CH3 CH;=ĊCH,CHCH;OH H2SO4, H3C H3C Referring to the above reaction: 1. Which atom does the H2SO4 first remove? 2. Identify the reaction if it's hydrogenation, hydrohalogenation, etc. 3. Propose a mechanism for the reaction, using the arrow formalism to indicate the flow of electrons.