6) Which of the following compounds has an R configuration? A) B) (HBC)3C H. H CICH3)3...
CHM 211 STEREOCHEMISTRY Chapter 5 3. Hexane and 3-methylpentane are examples of: (a) Enantiomers (6) Constitutional isomers (c) Diasercomers (d) Conformers 4. Which of the following is a meso compound? CH CHE CH Htci (a) CH (b) " (d) WH+ CH.CH H- CH.CH Htc CH H 5. Which of the following is NOT true about enantiomer? (a) The have the same boiling point (b) The have the same melting poing (c) The have the same density (d) The have the...
- 1. How many stereoisomers exist for 2-chloro-3-methylpentane? 1.now 2. Which of the following substituents has the highest priority? A. -COOH B.-CHOC.-CH,OH D. -CH, 3. Which of the following have the S configuration? HO- E. only i and ii G. only ii and iii A. only i B. only ii c. only iii D. all _4. Enantiomers would have the same: A. melting point B. solubility in CCI C. rotation of plane polarized light D. all of the above E....
3. Assign R or S configuration to the following molecules: Br F Н. F H- Br CH, Br CHECH, H CH2CH3 CH2CH3 CH, CH, -CHE OH H CH=CH2 H3CH2 HY CH(CH3)2 CH 4. Label each pair of stereoisomers below as A,B,C,D a Enantiomers b. Diastereomers Identical d Meso Compounds
PLEASE HELP WITH ALL. A. Which of the following Newman projections would represent the least stable conformer of 2,2,3.3-tetramethylbutane, looking down the 2,3 bond? H3C H3C H3C H3C CH3 b) CH3 H3C e) a) c) CH3 H3C CH3 CH CH3 CH о он B. which one of the following compounds would be chiral? Br он о он a) но HO O он HO C C. which of the following could potentially be used to distinguish between enantiomers? b) NMR c)...
Reaction Coordinate D)2 03 is incorrect Which of the following statment about thens A) All of the hydrogen atoms are in the same plane R) There is a total of five siga hands. The H-C-H hond angles are approximately 109.5" D) The carbon atoms are sp2 hybridized The H-C-H band angles are approximately 120". Which of the following has two equatorial alkyl substituents in its most stable conformation A) 1,2-dimethylcyclohexane B) -1,3-diethylcyclohen 13-diethylcyclohexane D -1,4-diethyleyelo n e E) LI-dimethylcyclohexane 7)...
4. Put an asterisk (*) next to each chiral center in the structure of erythronolide B, a metabone precursor to the commercial antibiotic, erythromycin. H3C .CH OH CH3 нс, Toi Erythronolide R Нас Анас OH 5. Determine whether the chirality centers in the following molecules have Rors configuration. (a) H (b) OCH2CH3 (c) OH NO-C-OH HC-CH3 H₃C-C-CH₂OH (a) HOH (b) c) HOCHZ HOCH2 CO2H 6. Are the following molecules chiral or achiral? If they are chiral, put an asterisk next...
6.(14) Determine the absolute configuration (R or S) for each chiral center in the following pairs of molecules. Also determine if the pairs are identical, enantiomers or diastereomers. CH3 ŅH uta ÇO2H a) b) & 11 CO2H & HO OH NH CH3 CH2 Cl -H CH3 CH3
3. Assign R or S configuration to the following molecules: Br I F H F H F Br Br -CHE CH=CH2 CH2CH3 CH2CH3 out from H₂C... -CH3 OH CH3CH, -CH=CH2 CH3 CH(CH3)2 H
A. Consider the following pairs of structures. Designate each chirality center as (R) or (S) and identify the relationship between them by describing them as representing enantiomers, diastereomers, constitutional isomers, or two molecules of the same compound. Use handheld molecular models to check your answers. B. Tartaric acid [HO2CCH(OH)CH(OH)CO2H] was an important compound in the history of stereochemistry. Two naturally occurring forms of tartaric acid are optically inactive. One optically inactive form has a melting point of 210 − 212 °...
3. Assign R or S configuration to the following molecules: Br F H F . Br F Br -CH CH=CH2 H CH2CH3 CH2CH3 CH3 CH2 --CH3 OH H -CH=CH2 H3C 7 CH3 H CH(CH3)2