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- 6. a) For each of the following pairs of molecules, identify the stereochemical relationship. Are they enantiomers, diastereomers, constitutional isomers, or the same molecule. CH3 н— сно i) ii) CHO H3C-OH НО HO ОН CI H CI iii) iv) Br H H H CI H. Br CI CI CI b) Explain why carbocation A is formed in step 2, rather than carbocation B (formed by the mechanism shown below). A Bwith clarity and detail explanation plza) Draw the mechanism, using good curved arrow notation, for the reaction of 2-methyl-2- butene with bromine in water, omitting any stereochemistry: b) (R)-3-butyn-2-ol is treated with 2 mol of HBr, yielding optically active Compound A (C4H8OBr2). Draw the structure of the reaction with the correct stereochemistry. c) Name Compound A above, including stereochemistry. d) Compound A is treated with HBr to yield Compound B (C4H7Br3). The resulting solution is optically inactive. Draw the product(s) obtained and explain why there is a loss in optical activity.
- :$:$;$;$;$;$ draw out neatlyPlease show the mechanism with arrow formalism.1,2-bis(methylthio)cyclohexane has two asymmetric carbons, thus 4 possible stereoisomers. However, one stereoisomer is a meso compound, so there are only 3. a) Draw all possible stereoisomers. Change the given structures by adding dashes and wedges. Draw the correct stereoisomer of each configuration above the provided labels. i.e draw the (R, S) configuration above the label (R, S). b) Label the enantiomers, diastereomers, and meso compound by filling in the chart (If you redraw the molecules, keep in the same order with the amine groups on the right side of the molecule!) Change the squiggly lines to dashed or wedges in the given structures to make 3 stereoisomers NH₂ NH₂ cyclopentane-1,2-diamine Enantiomers are structures Diastereomers are structures The meso compound is structure NH₂ C 1 (R, S) NH₂ NH Structure(s) 2 (S, S) 2 "NH₂ NH 2 NH 2 3 (R, R)
- chem 534 cha Hư OAC H please show stereochemistry H₂ COCH ? H CO₂CH3 O Ac 2. + ? hv 9 40°C 3. H₂ C 4. 0°C Catq Q-0 + [6+4] NGC ?. لك 5. [ V-CO₂CH3 + II NCCN [4+2] C6H5 6. 2 C6H5S Draw the product of the reaction showing the stereochemistry at any stereogenic centers. **** H [1] H-C=C [2] H₂O draw structure...A E OH OH H This is a(n) OH R B F PCC, CH₂Cl₂ H type reaction. The major product if R = CH₂CH3 is compound The major product if R = H is compound G Look at the given reaction and use the letter code corresponding to each compound in the blank to indicate the expected product(s), or fill in the blank with the appropriate vocabulary word or phrase. If a specific stereoisomer (e.g single enantiomer) is formed, select that isomer only. If a mixture of stereoisomers (e.g. racemic or diastereomers) is formed, select the single structure that shows the appropriate mixture (e.g. lines not dashes). If we convert the reagent to Na2CrO4, H₂SO4, H₂O: The major product if R = CH₂CH3 is compound The maior product if R = H is compound ??? OH D H H though compound