Which one of the following statements best describes the chemistry of ring A? D E он OH A Oleandrin is a toxic cardiac glycoside found in the poisonous plant, oleander (Nerium oleander L). It has a very long IUPAC name: acetic acid [(35,5R, 10S,13R,145,165,17'R)-14-hydroxy-3-[[[2R,45,55,65)-5-hydroxy-4-methoxy-6-methyl- 2-tetrahydropyranyl]oxy]-10,13-dimethyl-17-(5-oxo-2H-furan-3-y)-1,2,3,4,5,6,7,8,9,11,12,15,16,17- tetradecahydrocyclopenta[a]phenanthren-16-yl] ester O Ring-A can act as a reducing sugar O Ring-A can undergo mutarotation O Ring-A is non-reducing O Ring-A is a furanose B.

Provide the missing reactants, reagents, or products for the following reaction sequences below. If a sequence leads to a racemic mixture you should indicate "+ enantiomer." [or NH₂ CH,CHÍNH, H* (catalyst) total ele 1. LIAIH4 2. H₂O 0:

Quinapril (trade name Accupril) is used to treat high blood pressure andcongestive heart failure. One step in the synthesis of quinapril involvesreaction of the racemic alkyl bromide A with a single enantiomer of theamino ester B. Given the structure of quinapril, which one of these two products isneeded to synthesize the drug?

Draw the structure of the expected organic product(s) formed in the following reactions including correct stereochemistry. If the product is racemic write both isomers or write racemic. Assume all reagents listed are present in excess unless otherwise noted. If no reaction occurs, state 'No Reaction'

(a) 2-methyl-2-pentanol Draw the structure of the alkene that was used to prepare the alcohol in highest yield. AAVIL ? ChemDoodleⓇ Which process does this employ? 1. Hg(OAc)2, H₂O; 2. NaBH4 01. BH3; 2. H₂O2, NaOH OsO4, H₂O2 On n [ ]#

Write equations for the reaction of pent-2-ene with the following:(a) H2 and Pd catalyst (b) Br2(c) HCl(d) H2O and H2SO4 catalyst

H₂C 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 за

Predict the major products of both organic reactions. Be sure to use wedge and dash bonds to show the stereochemistry of the products when it's important, for example to distinguish between two different major products. : + ☑ + ☑ а 1. R₂BH 2. Н202, NaOH G 心 Click and drag drawing a str H2SO4, H₂O 4' Click and drag to drawing a struc HgSO4

Can someone help me with this?

Aa.92.