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Enantiomeric pairs: Diastereomeric pairs: Identical molecules: 2. For the structure given below,...
1. Consider the following Fischer projection formulas of 3-amino-2-butanol. Decide which pairs of the formulas are...
1. Consider the following Fischer projection formulas of 3-amino-2-butanol. Decide which pairs of the formulas are related as enantiomers, which are related as diastereomers, and which represent identical molecules. Assign R or S absolute configuration to C2 and C3 for each structure, and then decide. List your results by letters in the spaces provided below. (5 pts) CH2CH3 O CH3CH2 - NH căH HS CH2CH3 H. NH2 SH CH3CH2CH CH,CH2 C- NH, SH Enantiomeric pairs: Diastereomeric pairs: Identical molecules:
2.Draw a Newman projection, a wedge-dash structure and a Fischer projection for all four stereoisomers of 2-bromo-3-c...
2.Draw a
Newman projection, a wedge-dash structure and a Fischer projection
for all four stereoisomers of 2-bromo-3-chlorobutane.
The wedge dash
structure is
given for part
a – all you need to do is finish the Newman projection
and the
Fischer
projection.
a.2R,
3R.
On each
structure show how you determined where each group goes.
(part a
only)
b.2S,3S
c.2S,
3R
d.2R,
3S
CH3 Brci CH CH3
1. a. (4 points) Draw the dash-wedge structure of (2R,3S)-2,3-dichloropentane. b. (4 points) Draw the Fischer...
1. a. (4 points) Draw the dash-wedge structure of (2R,3S)-2,3-dichloropentane. b. (4 points) Draw the Fischer projection of enantiomer of the compound drawn in part a. Name the enantiomers. c. (6 points) Draw the Newman projections (looking down the C2-C3 bonds) of the diastereomers of the compound drawn in part b. Name the diastereomers.
1. a. (4 points) Draw the dash-wedge structure of (2R,3.5)-2,3-dichloropentane. b. (4 points) Draw the Fischer...
1. a. (4 points) Draw the dash-wedge structure of (2R,3.5)-2,3-dichloropentane. b. (4 points) Draw the Fischer projection of enantionmer of the compound drawn in part a. Name the enantiomers c. (6 points) Draw the Newman projections (looking down the C2-C3 bonds) of the diastereomers of the compound drawn in part b. Name the diastercomers 2. (6 points) Draw the mechanisms of the propagation steps of the reaction shown, focusing on the formation of the major product(s). NBS
2. Analyze each pair of compounds below. Identify which class of isomers each pair of structures...
2. Analyze each pair of compounds below. Identify which class of isomers each pair of structures represent. Your choices are: (i) constitutional, (ii) conformational, (iii) enantiomers, or (iv) diastereomers. Only one label for each pair should be used. For each case show work (drawings, (R)/(S), rotation of bonds, chair-flips, etc) which led you to each answer for the pairs below. Any differences of answers between you and your peers can be discussed and corrected as needed. OH H, H носно...
2. List the trend of relative reactivity of compounds in: SN2 & SN1. Indicate which favors...
2. List the trend of relative reactivity of compounds in: SN2 & SN1. Indicate which favors 1°, 2° or 3° carbon. 3. What makes a good leaving group, or poor leaving group in a substitution reaction? List examples. 4. What makes a good nucleophile or poor nucleophile group in a substitution reaction? List examples. Be able to identify the nucleophile in a reaction. 5. What makes a good solvent for an SN2 reaction? List examples. Assign R & S to...
Pleqsw help with this question 3. (a) Consider the bond-line (dash/wedge) structure shown below. Using the...
Pleqsw help with this question
3. (a) Consider the bond-line (dash/wedge) structure shown below. Using the Newman projection templates provided to the right of this bond-line structure, draw the overall lowest energy (most stable) and overall highest energy (least stable) conformation possible in Newman projection form sighting down the C C, bond indicated. Provide a one sentence explanation to justify for the overall most stable conformation. (Ipts each correct Newman, 2pts for valid explanation) sight down Cy-- - bond .23...
5. (3 pts each) For the following pairs of molecules, indicate if they are identical different compounds. enantiomer...
5. (3 pts each) For the following pairs of molecules, indicate if they are identical different compounds. enantiomers, diastereomers, or constitutional isomers CHE CH H3COH and HOT но — сня нас — Br Hc- Br CH2OH Леон нон он and a нус он Он но- нс сня CI HOBO но and нстве
3. (4 pts) Complete the Fischer projection drawn below by adding the four substituents to the chiral carbon of (s)...
3. (4 pts) Complete the Fischer projection drawn below by adding the four substituents to the chiral carbon of (s)-2-methyl-3-bromo-hexane. 4. (4 pts) Draw a wedge and dash structure representing (1R 2R,3S)-1,2- dichloro3-ethylcyclohexane. 5. (4pts) 2-bromobutane is shown below. Is this (R)-2-bromobutane or (S)-2 bromobutane? 6. (6 pts) For each chiral carbon in ascorbic acid (vitamin C), shown below, assign Ror S to each stereocenter. How many stereoisomers of ascorbic acid are possible? OH HO ОН 7. (9 pts) (Are...
Key concepts: molecular represenations, stereolsomers, RS enantiomeric excess, IPAC naming covention Provide the IUPAC name for...
Key concepts: molecular represenations, stereolsomers, RS enantiomeric excess, IPAC naming covention Provide the IUPAC name for each of the following molecules 0% HJC BM How similar are the names for B and C, even though there is the single change to the structure 2 Rank the priorities of these functional groups and substituents using Cahn-Ingold-Prelog nomenclature. Highest priority will be 1 and lowest will be 5; show your rationale CH:CH:CH CH CHCH:CH CHs,-SCH,-CH: CH:CH:CHCH CHCH, -CH2NHOH,-CH:NO Draw dash/wedge representations for...
1. Consider the following Fischer projection formulas of 3-amino-2-butanol. Decide which pairs of the formulas are related as enantiomers, which are related as diastereomers, and which represent identical molecules. Assign R or S absolute configuration to C2 and C3 for each structure, and then decide. List your results by letters in the spaces provided below. (5 pts) CH2CH3 O CH3CH2 - NH căH HS CH2CH3 H. NH2 SH CH3CH2CH CH,CH2 C- NH, SH Enantiomeric pairs: Diastereomeric pairs: Identical molecules:
2.Draw a
Newman projection, a wedge-dash structure and a Fischer projection
for all four stereoisomers of 2-bromo-3-chlorobutane.
The wedge dash
structure is
given for part
a – all you need to do is finish the Newman projection
and the
Fischer
projection.
a.2R,
3R.
On each
structure show how you determined where each group goes.
(part a
only)
b.2S,3S
c.2S,
3R
d.2R,
3S
CH3 Brci CH CH3
1. a. (4 points) Draw the dash-wedge structure of (2R,3S)-2,3-dichloropentane. b. (4 points) Draw the Fischer projection of enantiomer of the compound drawn in part a. Name the enantiomers. c. (6 points) Draw the Newman projections (looking down the C2-C3 bonds) of the diastereomers of the compound drawn in part b. Name the diastereomers.
1. a. (4 points) Draw the dash-wedge structure of (2R,3.5)-2,3-dichloropentane. b. (4 points) Draw the Fischer projection of enantionmer of the compound drawn in part a. Name the enantiomers c. (6 points) Draw the Newman projections (looking down the C2-C3 bonds) of the diastereomers of the compound drawn in part b. Name the diastercomers 2. (6 points) Draw the mechanisms of the propagation steps of the reaction shown, focusing on the formation of the major product(s). NBS
2. Analyze each pair of compounds below. Identify which class of isomers each pair of structures represent. Your choices are: (i) constitutional, (ii) conformational, (iii) enantiomers, or (iv) diastereomers. Only one label for each pair should be used. For each case show work (drawings, (R)/(S), rotation of bonds, chair-flips, etc) which led you to each answer for the pairs below. Any differences of answers between you and your peers can be discussed and corrected as needed. OH H, H носно...
2. List the trend of relative reactivity of compounds in: SN2 & SN1. Indicate which favors 1°, 2° or 3° carbon. 3. What makes a good leaving group, or poor leaving group in a substitution reaction? List examples. 4. What makes a good nucleophile or poor nucleophile group in a substitution reaction? List examples. Be able to identify the nucleophile in a reaction. 5. What makes a good solvent for an SN2 reaction? List examples. Assign R & S to...
Pleqsw help with this question
3. (a) Consider the bond-line (dash/wedge) structure shown below. Using the Newman projection templates provided to the right of this bond-line structure, draw the overall lowest energy (most stable) and overall highest energy (least stable) conformation possible in Newman projection form sighting down the C C, bond indicated. Provide a one sentence explanation to justify for the overall most stable conformation. (Ipts each correct Newman, 2pts for valid explanation) sight down Cy-- - bond .23...
5. (3 pts each) For the following pairs of molecules, indicate if they are identical different compounds. enantiomers, diastereomers, or constitutional isomers CHE CH H3COH and HOT но — сня нас — Br Hc- Br CH2OH Леон нон он and a нус он Он но- нс сня CI HOBO но and нстве
3. (4 pts) Complete the Fischer projection drawn below by adding the four substituents to the chiral carbon of (s)-2-methyl-3-bromo-hexane. 4. (4 pts) Draw a wedge and dash structure representing (1R 2R,3S)-1,2- dichloro3-ethylcyclohexane. 5. (4pts) 2-bromobutane is shown below. Is this (R)-2-bromobutane or (S)-2 bromobutane? 6. (6 pts) For each chiral carbon in ascorbic acid (vitamin C), shown below, assign Ror S to each stereocenter. How many stereoisomers of ascorbic acid are possible? OH HO ОН 7. (9 pts) (Are...
Key concepts: molecular represenations, stereolsomers, RS enantiomeric excess, IPAC naming covention Provide the IUPAC name for each of the following molecules 0% HJC BM How similar are the names for B and C, even though there is the single change to the structure 2 Rank the priorities of these functional groups and substituents using Cahn-Ingold-Prelog nomenclature. Highest priority will be 1 and lowest will be 5; show your rationale CH:CH:CH CH CHCH:CH CHs,-SCH,-CH: CH:CH:CHCH CHCH, -CH2NHOH,-CH:NO Draw dash/wedge representations for...
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