For all cases the priority of the substituents of stereocenter is: -Br > C (attached to Br) > Ph > H. We know configuration of a chiral center is R if 1 to 2 to 3 is clockwise from the opposite of C-4 bond and S if it is anticlockwise from opposite of C-4.
Now, we'll have a look to the configurations,
Molecule | Configuration of left chiral center | Configuration of right chiral center |
A | S | R |
B | R | S |
C | S | S |
D | R | R |
Now, we know for same connectivity for the same carbon, R configuration is the mirror image of S.
Both having a plane of symmetry, so they are meso.
NOTE: We have shown here the two meso compounds, actually they are same compound. So, there is no meaning of individually representing them. Even, one of them is the homomer of the other, not enantiomer. But for the sake of question, the answer should be written like this.
Br ph H Br prie Br ph Br The enantiomer at Dis: The enantiomer of A...
UCLEIC VIIICILIUUULLIS IULICU UUII LIUIUNTA LIUIUISLIUCIC. PLS a. Four possible products from the bromination of trans-stilbene are shown below. Label the chiral centers as Sor R. Ph HBr Br Ph phir H Br Ph Br Phuph Br Ph BrH b. The enantiomer of structure A is: C. The enantiomer of structure Dis: d. List the letters corresponding to the meso structures, if any:_ e. Which structures, if any, are chiral molecules:___ f. Which structures, if any, are achiral molecules:
2. Your lab manual proposes 3 possible mechanisms for bromination. During this lab, you will determine which iroduct(s) formed during the bromination of stilbene. (9 pts) a. Four possible products from the bromination of trans-stilbene are shown below. Label the chiral centers as Sor R. Ph Br Br H iph H Phil Br Ph Ph Br B. HINH Philiph Phí By HP b. The enantiomer of structure A is: c. The enantiomer of structure Dis: d. Ust the letters corresponding...
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few...
Name 03.101 example of a reaction having an Eact = 0 would Br• + Br-Br - > Br-Br + Br. F. + CH - > H-F + CH3. . CH. + CH, CH2 - CH + CH3 CH2 • .. Br + H-Br - > H-Br + Br. -. CH. + CH3 - > CH3-CH3 Which of the following is true of any (S)-enantiomer? 4. It rotates plane-polarized light to the right. b. It rotates plane-polarized light to the left....
Which molecule shown below is the enantiomer of the molecule provided? CI UBI H F Br F H F CH WHIC CI H FH ci -Br H -Br Br (a) (b) Br (c) (d)
Use the Fischer projection below to answer the following questions сн. Br- H H- Br CH,CH, (a) Write the IUPAC name for this molecule using the R/S notation (b) Draw the skeletal structure of the mirror Image, le the enantiomer, of the molecule whose Fischer projection is given above. (Show one wedge bond, one dashed bond, and two sticks attached to the chiral carbon. Show the hydrogen atom bonded to the chiral carbon atom as either a wedge or dash...
Design a synthesis for the transformation below. Br. ? CH2CH3 'H + enantiomer Br A. B. C. D. E. 1. Br2, CC14 1. H2, Lindlar's cat.; 1. Bra, CC14 1. Na, NH3(1): 1. Br2, CC14 2. H2, Lindlar's cat. 2. Br2 2. Na, NH3(1) 2. Br2 2. H2, Pt А. B O OE
EXAM 0 would be: 1. An example of a reaction having an E,ct a. Br +Br-Br Br-Br Br. b. F CH4 H-FCH3 c. CH3 +CH, CH d. Br. +H-Br >CH4 CH,CH2 H-BrBr CH3-CH e. CH, +CH, 2. Which of the following is true of any (S)-enantiomer? a. It rotates plane-polarized light to the right. It rotates plane-polarized 1ight to the left. C. It is a racemic form. d. It is the mirror image of the corresponding (R)-enantiomer. e. It has...
? (CH3)2CHCH2CECH (CH3)-CHCHCCH (d) Br ? + enantiomer ? -C=C-H CEC (f) Hint: this is a multistep synthesis. Propose a series of reactions that would achieve the following transformation. Make sure to number the steps. Br ?
CHE CHE CH3 HC CH3 Br CH3 Br Brs H CH3 2,3-dibromobutane The wedge-dash representation of 2,3-dibromobutane is shown. What is the orientation of the chiral center(s)? 25 Write the orientation as in the following examples, (25) or (2,3S), not 2s or 2,35. Je sure to include the parentheses and the number, and comma as necessar Which of the Newman structures is equivalent to the wedge-dash structure? - D Note that the equivalent Newman structure will not necessarily have the...