Question 2a = How many stereoisomers are there? Question 2b = There are chiral stereoisomers, achiral but not meso stereoisomers, and meso stereoisomers Question 2b: Label each stereoisomer as chiral, achiral but not meso, or meso. Question 2a: Draw all of the stereoisomers. Are these the same? How many isomers are chiral? How many isomers are meso?
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- Write the name of the following compounds. Which of them are stereoisomers? Which of them are optically active? Use cis-trans, (E)(Z) nomenclature and assign the absolute configuration (R),(S), if any to each chiral center.H ÇI CH3-C-COOH он CH3-C-CH2Br 1. ČI a b 81. Consider the structures above. Which of these two contains a stereocenter? Draw thestructure on your answer sheet and mark the stereocenter with an asterisk. 82. Which of these two is a chiral molecule? Explain your answer. 83. Which of these two can exist as a pair of enantiomers? 84. Draw the pair of enantiomers using three-dimensional representation.Stereoisomers are isomers that differ in spatial arrangement of atoms, rather than connectivity of atoms. Stereoisomers have different properties, especially in biological systems. Which is the stereochemical relationship between this pair of molecules? OH "OH 8p OH OH ...||| 4 A) enantiomers B) diastereomers C) identical compounds D) constitutional isomers E) Not isomers
- 2. The number of possible stereoisomers can be determined by the equation 2" where n = number of asymmetric centers. For the following molecule, what is the possible number of stereoisomers? Draw out all possible stereoisomers. Are there structures that are identical to each other? CH3 но1b. Draw ALL isomers (including all stereisomers) of trichlorocyclopentane. Indicate which ones are chiral.ÇI CH3CH=CHCHCH3 4-chloro-2-pentene Four stereoisomers exist for 4-chloro-2-pentene. Draw the structure of the isomer that has the E configuration around the double bond and the S configuration at the chiral center. • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • You do not have to explicitly draw H atoms. • If a group is achiral, do not use wedged or hashed bonds on it.
- OH CHзCH-CHCHCH-CHз 4-hexen-3-ol Four stereoisomers exist for 4-hexen-3-ol. Draw the structure of the isomer that has the Z configuration around the double bond and the R configuration at the chiral center. • Use the wedge/hash bond tools to indicate stereochemistry where it exists. You do not have to explicitly draw H atoms. • If a group is achiral, do not use wedged or hashed bonds on it. opy aste Previous NextRefer to the following molecule: CH,CH, Br H. H,C NO2 How many achiral carbons are there? Select ] The molecule is chiral. [ Select] What is the configuration on C2? [Select ] Does the molecule have a meso isomer? [ Select ] How many stereoisomers does the molecule have (including the one already shown)? [ Select ] How many diastereomer pairs does the molecule have? [Select] If the -NO2 and -Br switched places, the new compound will be [Select] with the original compound. What is the third priority substituent on carbon 2? Select]Draw all possible stereoisomers for HC=OCHClCHClCH2Br. Label the compounds as Compound I, II, etc.. Determine the relation of each of these compounds to another (pair relations as enantiomers, diastereomer, mesocompound or no relations).
- 1a. How many stereogenic centers are present 1c. Draw a three-dimensional structure of a in the structure below? Indicate them with asterisk(s). How many stereoisomers stereoisomers are possible? chiral compound with the molecular formula of C4H4Cl₂ that does not have a stereogenic carbon. In addition, draw the enantiomer of this compound. Number of stereogenic centers: Number of stereoisomers possible: 1b. Draw one of the two most stable stereoisomers of the compound in 1a using a planar structure with wedges and dashes. Now draw it in its preferred chair conformation. 1d. Draw two meso compounds with the molecular formula of C7H14.3. Draw the structural formula of 3-bromo-2-chloropentane. Identify the chiral carbons with asterisks. Using 2n formula (n is number of chiral centers) calculate the number of stereoisomers. Construct 2 pairs of mirror images. Take one pair of the enantiomers, compare it with the either of the models of the second pair of enantiomers. Are these two molecules mirror images? Draw the fisher projections of the four stereoisomers and identify diastereomers.Draw the possible stereoisomers of 3,4-dichlorohexane. Label enantiomers, diastereomers and meso compounds.