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- Step 2: A hemiacetal formation has a similar mechanism to the hydrate reaction, except 1 equivalent of alcohol is added instead of water. 1² R₂ R₁ LOR3 R₁ R₂ The hemiacetal reaction is also reversible and can also be catalyzed by either acid or base. Hemiacetals are not usually isolated, except in the formation of 5- and 6-membered rings, as often seen in carbohydrate chemistry. Identify the hemiacetal formed from the intramolecular cyclization of the molecule shown. OH H OH R3OH OH OH OH CH₂OH NaOH ?5) Complete the following reactions a) cH3- CHz COOH + b) cH3 - CHz CooHt LioH - c) CH3 COOH + Hg CO3Draw the major product(s) when the following molecule is reacted with excess NaOEt in EtOH, followed by aqueous acidic work-up. CH;CH,OĊCH(CH,)¿COCH,CH3 CHa
- Which compound is the major product of the reaction sequence shown? (1) SOCE (A) (B) OH OH (2) (CH3);CO Na (CH3);COH (C) (D) O Na Na CI Compound D Compound A Compound C Compound BIf the following sesquiterpene is synthesized in a medium containing acetate with a 14C-labeled carbonyl carbon, which carbons will be labeled?The major product formed in the following transformation is Me N Ph (i) Bu₂BOTf, i-Pr₂NEt (ii) PhCHO HO
- provide a mechanism which explains the following conversion OH ist NaOH H₂O9a) The proton bonded to the carbon adjacent to the carbonyl group in the following compound can be classified into which chemical shift in the ¹H-NMR spectra of aldehydes and ketones? R or H H - 10.0-12.0 ppm R H -2.0-3.0 ppm NO₂ N (1) 9b) Choose the one below that could be resolved into enantiomers. (1) alpha hydrogens = ? ppm NO₂ NO₂ 9c) Which of the following is the major product of the reaction below. `N H -5.0-7.0 ppm (11) (11) -0.0-1.0 ppm HNO3, H₂SO4 H NO₂ (III) NO₂ (1) and (II) (IV) None of the options (IV)Draw a plausible mechanism for the following transformation H₂O* Z-I H
- Select the most appropriate reagent combination to successfully execute the following reaction. ? OH OH + enantiomer A) H₂SO4, H₂O B) i) RCO3H, ii) H3O+ C) i) 03, ii) DMSPart A Provide the reagents necessary to complete the following transformation. CH2CH3 CH,CH3 enantiomer O H2O, H2SO4 O mСРВА О 1) ВНз * ТHF 2) H2O2, Но- Os04, H2O2 О 1) СН3СОЗ Н 2) Н*, Н2ОDraw the major product(s) when the following molecule is reacted with excess NaOEt in EtOH, followed by aqueous acidic work-up. CH;CH,CH,COOCH2CH3