Which of the following molecules exists as a pair of enantiomers? O 2-Cyclohexen-1-ol O cis-1,2-Dichlorocyclobutane O 1-Bromo-3-methylbutane O more than one answer 2-Bromopropane
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Q: Draw the R and S enantiomer of the molecul ÇI Br ČH3 1-bromo-1-chloroethane
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- For the given ee values, calculate the percentage of each enantiomer present. Q: 99% eeDraw one of each pair of enantiomers or diastereomers for each of the following compounds using a perspective formula (dash-wedge). You must indicate the points of stereochemistry (E, Z, R, S) plus locant numbers. State if no stereoisomers are possible. Write your answer in the blank space (j) 3,3-dimethylpentane(e) 3-heptene(f) 2-chloro-3-butyl-4,5-dimethyl-3-hexene (4-(1-chloroethyl)-2,3-dimethyl-3-octene)The substitution product of (S)-3-chloro-3-phenyl-heptane in methanol will be _______________. a racemix mix the (S)-enantiomer the (R)-enantiomer not chiral
- a) Draw a 2-dimensional structure of 4,5-dibromooctane and label, with an asterisk, thetetrahedral stereo centers.b) What is the maximum number of stereoisomers for this molecule?c) Draw Fischer projections of all the potential stereoisomers of (a).d) Label, on the above projections, all the stereocenters as R or S.e) Indicate the enantiomers, diastereomers and the meso compound if present.For each ee value (enantiomeric excess value), calculate the percentage of each enantiomer presentWhat stereoisomers are obtained from hydroboration–oxidation of the following compounds? Assign an R or S configuration to each asymmetric center. a. cyclohexene b. 1-ethylcyclohexene c. cis-2-butene d. (Z)-3,4-dimethyl-3-hexene
- Arrange the following group in order of increasing priority. Q) -OCH3 -CH(CH3)2 -B(CH2CH3)2 -HWhen carbonyl compounds are reduced with a reagent such as LiAlH4 or NaBH4 and a new stereogenic center is formed, what will the composition of the product mixture be? Forms more of one enantiomer than another because of steric reasons around the carbonyl Forms more of one enantiomer than another depending on the temperature of the reaction Forms different products depending on the solvent used Forms a racemic mixture of the two possible enantiomersThe absolute configuration of BAGO is (dextrorotatory, levorotatory, R, S). The melting point of its enantiomer will be (higher, lower, equal) than/with 197.2. The relative configuration of its enantiomer will be (dextrorotatory, levorotatory, R, S). The density of BAGO is (higher, lower, equal, twice) the density of its enantiomer.
- 0 Propylene oxide is a chiral molecule. Hydrolysis of propylene oxide gives propylene glycol, another chiral molecule.(a) Draw the enantiomers of propylene oxideWe saw that the energy cost of an axial methyl is 1.8 kcal/mol; therefore, we might expect cis-1,3-dimethylcyclohexane to have chair conformations with a difference in totalenergy of 3.6 kcal/mol. 1. Is the calculated energy difference in cis-1,3-dimethylcyclohexane higher or lower than expected? Propose an explanation for the difference between the expected energy difference and the calculated energy difference in cis-1,3-dimethylcyclohexane. (Limit your answer to 10 words or fewer) 2. Recall that an axial methyl is typically worth around 1.8 kcal/mol. Propose an explanation for the difference in the value above for 1-methyltetrahydropyran. (Limit your answer to 10 words or less) 3. Would you expect the difference in strain energy between the chairs of 5-methyl-1,3-dioxane to be greater than or less than that of 1-methyltetrahydropyran? Is it GREATER THAN or LESS THAN?Which of the following is/ meso compounds? A) I B) II C) III D) I and II