(b) Assign the priorities (as either high and low, or 1 and 2) for the groups of the alkene. Based on those assigned priorities, predict the configuration (E or Z). Include the priority directly adjacent to the corresponding group. -Br OH
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- 1. E/Z and Chirality.. (a)) Assign the priorities (as either high and low, or 1 and 2) for the four groups of the alkene. Based on those assigned priorities, predict the configuration (E or Z). Include the corresponding priority directly adjacent to each of the four groups. H3C H3C -CH3 HO (b) . ✓) Assign each of the following molecules as chiral or achiral. (i) HO H OH (ii) H₂C" CH3 H3C H BH H Br CH3 2. E2 Mechanism and Products Draw an arrow pushing mechanism for the elimination reaction below and draw all products formed (including all organic and inorganic products). O=S. H | CH2 CH3 HI, H H3C CH3 HStereochemistry The alkyl bromide below can undergo an E2 but not in its shown conformation. Draw the conformer (as a line drawing, not a Newman projection) out of which an E2 elimination can occur, with all bonds/groups in the original drawing included. 'Bu = tert-butyl H3C H H3C Br tBu alkyl bromide (b) Draw the alkene formed in the E2 elimination reaction of this alkyl bromide promoted by potassium tert-butoxide (KOtBu). (c) Indicate if this E2 elimination reaction is stereospecific or stereoselective (write or circle stereospecific or stereoselective) Regioselectivity (d) Two potential products can form in the following E2 elimination promoted by KOtBu. Circle the major alkene product. (e) KOtBu H3C H3C Indicate if the reaction in (d) is under kinetic control or thermodynamic control. (write or circle kinetic or thermodynamic control) 5Draw the structure of (Z)-4-methyl-2-pentene. • Consider E/Z stereochemistry of alkenes. You do not have to explicitly draw H atoms. opy aste ChemDoodle
- Arrange the following groups in order of decreasing priority that would allow you to determine E/Z, or R/S. Provide a string of letters (e.g. abcd) as an answer with the highest priority listed first, lowest priority last. (a) (b) order: order: a)-CH3 a)-CH3 b) -CH₂OH b)-H c)-CH2NH2 c) -Br d) -CH₂ Br d) -COOHAssign priorities to these set of Substituents (in assigning priority write numbers 1,2,3,4 below the structure of the molecules on the space given). Give explanation.1. E/Z and Chirality.. (a) ) Assign the priorities (as either high and low, or 1 and 2) for the four groups of the alkene. Based on those assigned priorities, predict the configuration (E or Z). Include the corresponding priority directly adjacent to each of the four groups. H3C H3C ॐ HO CH3 _) Assign each of the following molecules as chiral or achiral. (b). (i) HO (ii) Н E OH H₂CCH₂ Н H3C H Br Br H CH3 2. E2 Mechanism and Products Draw an arrow pushing mechanism for the elimination reaction below and draw all products formed (including all organic and inorganic products). H CH2 O=S. HII. CH3 H 'H H3C CH3
- (a) Draw all stereoisomers formed by monochlorination of the cis and trans isomers of 1,2-dimethylcyclobutane drawn below. (b) How many constitutional isomers are formed in each reaction? (c) Label any pairs of enantiomers formed.Using the Cahn-Ingold-Prelog sequence rules, assign configurations to EACH of the alkenes (A-D) .as E or Z Write your answers in the box below CH3 CH,CH2OH CH2CH3 H3C H3CO CD CH3 Br D.1. Elimination reactions and principles of reactivity Stereochemistry (a) The alkyl bromide below can undergo an E2 but not in its shown conformation. Draw the conformer (as a line drawing, not a Newman projection) out of which an E2 elimination can occur, with all bonds/groups in the original drawing included. 'Bu = tert-butyl H3C H&C H Br H tBu alkyl bromide (b) Draw the alkene formed in the E2 elimination reaction of this alkyl bromide promoted by potassium tert-butoxide (KOtBu). (c) Indicate if this E2 elimination reaction is stereospecific or stereoselective (write or circle stereospecific or stereoselective)