Homework Answers
Shown below are the two Newmann projections of n-pentane. anti-conformation is where the methyl and ethyl groups are maximum far apart. gauche is when the methyl and ethyl groups are at 60 degrees to each other.
Thus, the highest energy would be of the gauche conformation, Me, Et interaction has 0.9 kcal of energy and Et, H has 0.1 kcal energy. So the gauche would be 0.8 kcal higher in energy than anti conformation.
anti conformation would be more stable (lower energy by 0.8 kcal) than gauche conformation (higher energy by 0.8 kcal).
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Understanding Conformation Analysis Draw two Newman Projections for a n-pentane that depict and anti and gauche...
9.78 The two lowest energy conformations of pentane are the anti-anti and the anti-gauche forms, in...
9.78 The two lowest energy conformations of pentane are the anti-anti and the anti-gauche forms, in terms of arrangements around the two central C─C bonds. A recent study analyzed the conformations of 3-heptyne as an “elongated” analogue of pentane, where a carbon-carbon triple bond is “inserted” between C2 and C3 of pentane.[15] Interestingly, the researchers found that in each of the two most stable conformations of 3-heptyne, C1 and C6 are nearly eclipsed (looking down the alkyne group). In one...
Using Newman projection draw an eclipsed, gauche, and anti conformation for the compound brlow and indicate...
Using Newman projection draw an eclipsed, gauche, and anti conformation for the compound brlow and indicate which is the most stable. 2-Iodobutane (C2-C3 bond)
Challenge Problem 09.78 The two lowest energy conformations of pentane are the anti-anti and the anti-gauche...
Challenge Problem 09.78 The two lowest energy conformations of pentane are the anti-anti and the anti-gauche forms, in terms of arrangements around the two central C-C bonds. A recent study analyzed the conformations of 3-heptyne as an "elongated" analogue of pentane, where a carbon-carbon triple bond is "inserted" between C2 and C3 of pentane (J. Phys. Chem. A. 2007, 111, 3513-3518). Interestingly, the researchers found that in each of the two most stable conformations of 3-heptyne, C1 and C6 are...
1. Draw the Neman Projection of the following Promane descriptions Newman projection for most stable Newman...
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2. Consider the C2-C3 bond in n-pentane: a. Draw a Newman projection for the molecule. b....
2. Consider the C2-C3 bond in n-pentane: a. Draw a Newman projection for the molecule. b. Show its most unstable conformation. c. Show its most stable conformation. d. Show one gauche conformation.
3. Consider 2,2,4-trimethylpentane Draw this compound. a. b. Now, provide Newman projections for the three staggered...
3. Consider 2,2,4-trimethylpentane Draw this compound. a. b. Now, provide Newman projections for the three staggered conformations for this compound looking down the C3 - C4 bond. c. Label the orientation of substituents (i.e. gauche or anti) in each structure and circle the most stable conformation(S)
Starting with the fully eclipsed Newman projection, how many gauche and how many anti Newman projections...
Starting with the fully eclipsed Newman projection, how many gauche and how many anti Newman projections will you encounter when the back C atom (C3) in the C2-C3 bond in butane is rotated clockwise from 0 to 360 degrees? Select one: a. two gauche, one anti b. one gauche, two anti c. one gauche, one anti d. two gauche, two anti
draw the Newman projections. questions 1,2 and 3 1. (1 pts) 1 pts) Draw the Newman projection for the following spe...
draw the Newman projections. questions 1,2 and 3
1. (1 pts) 1 pts) Draw the Newman projection for the following species, looking down the between (i) ethyl and carboxylic acid group and (ii) OH and carboxylic acid group as the answer). in the bond indicated. Idell as anti, eclipsed or gauche соон OH (1) anti, eclipsed or gauche COOH WH HN (ii) anti, eclipsed or gauche 2. (1 pt.) Which conformation in question 1 is more stable (a) or (b)?...
A) this corresponds to an anti conformation in general, gauche conformations possess the lowest post it...
A) this corresponds to an anti conformation in general, gauche conformations possess the lowest post it is stabilized by intramolecular hydrogen bonding D) it is a staggered conformation. E) it has the highest energy of all the possibilities sible minimum e gy Section 2 Give the IUPAC name corresponding to the followin onding to the following structure: ection formula for the most stable conformation of the C2-C3 2) Draw the Newman projection formula for the most stable bond in 3-methylpentane.
5. Draw the Newman projections for the anti conformation and two types of eclipsed conformations of...
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Using Newman projection draw an eclipsed, gauche, and anti conformation for the compound brlow and indicate which is the most stable. 2-Iodobutane (C2-C3 bond)
Challenge Problem 09.78 The two lowest energy conformations of pentane are the anti-anti and the anti-gauche forms, in terms of arrangements around the two central C-C bonds. A recent study analyzed the conformations of 3-heptyne as an "elongated" analogue of pentane, where a carbon-carbon triple bond is "inserted" between C2 and C3 of pentane (J. Phys. Chem. A. 2007, 111, 3513-3518). Interestingly, the researchers found that in each of the two most stable conformations of 3-heptyne, C1 and C6 are...
1. Draw the Neman Projection of the following Promane descriptions Newman projection for most stable Newman projection for least stable conformation conformation 2. Draw the Newman projections for butane looking down the C2-C3 bond through a full 360 degree rotation. Start with the anti-staggered Newman projection then draw and label each Newman projection (staggered, eclipsed, gauche, anti-staggered, fully-eclipsed) for every 60 degrees of rotation Newman projection for most stable Newman projection for second-most stable conformation Conformation Newman projection for least...
2. Consider the C2-C3 bond in n-pentane: a. Draw a Newman projection for the molecule. b. Show its most unstable conformation. c. Show its most stable conformation. d. Show one gauche conformation.
3. Consider 2,2,4-trimethylpentane Draw this compound. a. b. Now, provide Newman projections for the three staggered conformations for this compound looking down the C3 - C4 bond. c. Label the orientation of substituents (i.e. gauche or anti) in each structure and circle the most stable conformation(S)
draw the Newman projections. questions 1,2 and 3
1. (1 pts) 1 pts) Draw the Newman projection for the following species, looking down the between (i) ethyl and carboxylic acid group and (ii) OH and carboxylic acid group as the answer). in the bond indicated. Idell as anti, eclipsed or gauche соон OH (1) anti, eclipsed or gauche COOH WH HN (ii) anti, eclipsed or gauche 2. (1 pt.) Which conformation in question 1 is more stable (a) or (b)?...
A) this corresponds to an anti conformation in general, gauche conformations possess the lowest post it is stabilized by intramolecular hydrogen bonding D) it is a staggered conformation. E) it has the highest energy of all the possibilities sible minimum e gy Section 2 Give the IUPAC name corresponding to the followin onding to the following structure: ection formula for the most stable conformation of the C2-C3 2) Draw the Newman projection formula for the most stable bond in 3-methylpentane.
5. Draw the Newman projections for the anti conformation and two types of eclipsed conformations of 1,2-diiodoethane. Of the two eclipsed conformations, which is of higher energy, and why?
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