Question 14 Which of the following are meso compounds? Check all that apply. (a) CH, (b) (c) H H CH, HO H. Br H,C CH,CH, CH,CH, CH, H. H CH, (d) (e) (f) CI H H H CI Ci CI O e O b f a
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- - с app.101edu.co Identify which of the following compounds is meso. I H₂CO H III H C H₂CO HCI Н A) 1 B) II Question 52 of 67 C) III D) IV OCH H₂CO "CH3 H C H CH₂ OCH₂ IV Н H₂CO H.C Н OCH, "H CH3 CH3 OCH₂ S В SubChemistry 240, Organic Chemistry 1 R, S stereoisomers: Rules for assigning R, S stereochemistry 1. Build the following molecule using your model kit. Prioritize the 4 atoms bonded to chirality center. CH3 Br H3CH2C H. 2. Practice redrawing the molecule such that the lowest priority group points towards the BACK. Determine whether this stereoisomer is R or S. 3. Repeat 1 and 2 with the following molecule: CH3 H2N H. 4. Assign R and S stereochemistry to the chirality centers in the following molecules: Br H CH3 CH3 5. Instead of redrawing a molecule to make the lowest priority group point towards the BACK, there is a trick you can use to determine R, S stereochemistry: a. Prioritize the four groups present b. Switch the lowest priority group with the group pointing back. By switching the two groups you've made the other enantiomer. Prove this to yourself! Once lowest priority group is pointing back, determine the stereochemistry. The original molecule has the stereochemistry that is the…Which of the following statements is TRUE? H2N Mẹ. F Ph Select one: O a. This molecule is called (1S,2R)-2-fluoro-1-phenylpropan- b. This molecule is called (1R,2S)-2-fluoro-1-phenylpropan- C. None of others O d. This molecule is called (1R,2R)-2-fluoro-1-phenylpropan-I e. This molecule is called (1S,2S)-2-fluoro-1-phenylpropan-1
- d) e) H₂CN NH ره b ...ОН OH H CH₂ 1. (CH3)₂CHMgBr, ether 2. NH,C1, H,O .CH, CH₂OH Products Products "c H Br. ü OH H ¹0 CH₂ شده NH Br. oły OH OH CH₂ CH,ぐ=m, Part 4: Cycloalkanes and Stereochemistry. assignment. Br Br Br ...|H ...H ... H ..iBr H. Br Br .... ICH3 H. 18. For rings that an the and label each atom as R or S. Some rings will not have an R or SCOOEt COOEt 1. Eto Na+ 2. HCI, H₂O compound a NaOH, H₂O Heat • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • Do not include lone pairs in your answer. They will not be considered in the grading. • Do not include counter-ions, e.g., Na+, I, in your answer. compound b HCI, H₂O Heat Claisen condensation between a diethyl ester and an ethyl ester followed by saponification, acidification, and decarboxylation forms a diketone. Work out this synthesis on a separate sheet of paper, and then draw the structure of compound a. compound c (C9H12O2)
- 4-1 Which of the following compounds are chiral? Me H Me a. b. C. H `CO,H Et Ph, Ме d. Me f. -сон Ph CI1, part A) We observe 6 carbon stereocenters in the molecule below. Indicate each stereocenter, and give the absolute S or R configuration. 1, part B) Indicate each stereoisomer in this molecule, and give the absolute S or R configuration. Then, indicate E or Z configuration of all alkenes in it (*ignoring aromatic ring*).04. Which of the following reaction sequences produces 3-methylhexan-1-ol? A) Mg 1)CH,CCH 1-bromobutane 2.) H,0* B) 3-bromopentane Mg" 1.)CH,CH=O 2.) H30 Mg 1.) H,C=0 2-bromohexane 2.) H;O" Do D) Mg" 1.) 2-bromopentane 2.) H;O" E) 1.)CH,CCH, 2.) l1;0" Mg" 1-bromoethane (2 equivalents)
- mapter 4 Problem 54 Part A Identify all meso compounds. CI H3C H A H3C оо 00 Check all that apply. 64°F A В C D Submit CI CA Provide Feedback CI M H3C Н CI В H3C Request Answer CI н FIA Н. CI с H3C H3C Н CI C "!!!! H CI H3C .... D H3C H 0 H CI ГIdentify the meso compound or compounds. H. H. Br-C-CI -C-Br Br C-CI CH -C-Br Br-C-CI Br-C-CI CI C-Br CI -C-Br H. H. H. H.CH3 CH:CONA (7a) (7b)_. + NaCI CH3 (8) H2O CH3CO CH3 7. 8.