2- Show how appropriate manipulation of protecting groups and/or selective reagents could be used to effect the following transformations. HOCH2 (a) HOCH O. PhCH₂OCH2 O. OCH3 O+CH3 PhCH₂O OH HOCH2 CH3 Ph (b) HO CH₂OH -O HO PhCH₂O HO OCH3 PhCH₂O OCH3 (၁) CH2OCPh3 Ph CH3OH3C OCH 3 (d) OCH₂Ph -OH HO OH CH3OH3C OCH 3 OH CH3 CH3
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- 3A Complete the reactions below. H₂SO4/H₂O HgSO4 A NaBH4 EtOH B лH₂SO4 CH₂C ཏཱཏི 1 ནི OH 1. Br2, PBг3 2. H₂O H3C OH Br The a-bromination of carbonyl compounds by Br2 in acetic acid is limited to aldehydes and ketones because acids, esters, and amides don't enolize to a sufficient extent. Carboxylic acids, however, can be a-brominated by first converting the carboxylic acid to an acid bromide by treatment with PBr3. Following enolization of the acid bromide, Br2 reacts in an a-substitution reaction. Hydrolysis of the acid bromide completes the reaction. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions :0: H3C Br Br + :::OH2 Br H₂O H3C Br заIdentify compounds A and B from the following reaction sequence LINH lig MeO 0 (Ozone) MeOH Me₂S B
- Ethylene oxide is the starting material for the synthesis of 1,4-dioxane. Propose a mechanism for each step in this synthesis.Provide the reagent(s) and the reaction mechanism of the following reaction H₂N+ hv H.2 + Propose a mechanism for the reaction that fully accounts for the formation of both products.
- c) Draw a mechanism for the formation of EtCH2COOH from the reaction of MeCOCH(Et)COOEt with ww w m NaOH in EtOH. d) Suggest a mechanism for the following reaction and explain the driving force for the reaction: Me i) NaOEVEIOH Me Co,Et CO,Et i) H*An acetal produces the following three compounds upon hydrolysis. Of acetals A-E which could it be? H3CO OCH3 П A B U D Acetal A H2O H₂SO4(cat.) замен поста "OCH3 В + HO. H₂CO ОН D + OCH3 CH3OH E OCH3 "OCH3Reaction with which of the following compounds in an acetylide reaction would lengthen the carbon chain by one carbon and add a primary alcohol? O ethanal O formaldehyde О ерохide O acetone O carbonic acid QUESTION 4 The reagent/reaction of choice for this reduction is || HC-CH=CH-CH2CH2CH2 CO2H CH2OH-CH=CH-CH2CH2CH2 CO2H O lithium aluminum hydride O potassium permanganate O sodium borohydride O Grignard reaction O SN2 reaction
- Identify the reagents needed to carry out each reaction. HBr Br KOC(CH,b HO TSCI pyridine COTS TSOH Br NaH NBS H,0 Cl, HO Br Он CI HO..Reaction of phenol with acetone in the presence of an acid catalyst gives a compound known as bisphenol A, which is used in the production of epoxy and polycarbonate resins Propose a mechanism for the formation of bisphenol A. OH H;PO, + H,O НО HO Phenol Acetone Bisphenol A1. Predict the product and provide the mechanism for the following reversible nucleophilic addition. NaOH in H₂O 2. Predict the product and provide the mechanism for the following reversible nucleophilic addition. H2SO4 (cat) H EtOH