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Make a model of methylcyclohexane (in the chair conformation) by heir conformation he hydrogen with a...
4. Newman projection-like view of chair conformation of methylcyclohexane with methyl group in the axial position....
4. Newman projection-like view of chair conformation of methylcyclohexane with methyl group in the axial position. 5. Demonstration of steric strain in of axial methyl group in methylcyclohexane. Briefly define “steric strain”.
4 4. (a) Draw the structure of the two chair forms of methylcyclohexane. Draw in all...
4 4. (a) Draw the structure of the two chair forms of methylcyclohexane. Draw in all bonds (even the C-H bonds). Be sure the axial and equatorial bonds are shown correctly. On the appropriate structure, indicate the 1,3-diaxial interactions involving the methyl group. (b) Which is more stable, trans-1,3-dimethylcyclohexane or cis-1,3-dimethylcyclohexane? Why? 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...
Remove one hydrogen atom from C_1 the hexane model, and one H atom plus its bond...
Remove one hydrogen atom from C_1 the hexane model, and one H atom plus its bond from C_6. Bend the carbon chain around and join C_1 to C_6 to make cyclohexane. Mentally designate one carbon as C_1. Place the model in the chair conformation by tipping C_1 up and C_4 down. Check the conformation with the instructor. Identify the axial and equatorial hydrogens and describe their orientation relative to the plane of the ring. Look down each successive C-C bond...
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as...
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as axial or equatorial 10. Draw the most stable chair conformation of the following molecules, and estimate the amount of strain in each: (a) trans-1-Chloro-3-methylcyclohexane (b) cis-1-Ethyl-2-methylcyclohexane (c) cis-1-Bromo-4-ethylcyclohexane (d) cis-1-tert-Butylcyclohexane 11. Which isomer is more stable, cis-decalin or trans-decalin? Explain. 12. Glucose exists in two forms having a 36:64 ratio at equilibrium. Draw a skeletal structure of each, describe the difference between them and...
Page < 2 > of 5 0 8) In the most stable conformation of tert-butylcyclohexane, how...
Page < 2 > of 5 0 8) In the most stable conformation of tert-butylcyclohexane, how many axial hydrogen atoms are present? a. O Eb. 2 e. 6 9) Which statement is true concerning the mechanism for reaction between HBr and H2C=CH2 to form bromoethane? a the reaction forms mechanism shows electron movement using full arrows, e.g. b. the reaction involves a slow, rate-determining formation of a radical intermediate c. the reaction involves homolysis d. In the first step, HBr...
TU c) Start with the model of propene built in 3a), substituting different hydrogen atoms of...
TU c) Start with the model of propene built in 3a), substituting different hydrogen atoms of propene with a methyl group to form isomers of butene, CaHg. How many different isomers exist for butene (C4Hg)? Prepare models and draw the Lewis structures for each of the isomers. d) Two of isomers of butene comprise a pair of stereoisomers. Draw the skeletal structures and include IUPAC names for the cis and trans isomers. Recall in the cis isomer both methyl groups...
3. Cyclic compounds The presence of the ring in all but very large ring cyclic molecules...
3. Cyclic compounds The presence of the ring in all but very large ring cyclic molecules prevents full rotation of the ring atoms. For this reason, stereoisomerism may also occur in cyclic molecules. a) Prepare a model of cyclohexane, C6H12. Draw the condensed formula. b) Build a model of methylcyclohexane (C7H14) by replacing one of the hydrogens of cyclohexane with a methyl group. Draw the skeletal formula for methylcyclohexane. 2 c) How many different isomers exist for methylcyclohexane (CyH34)? d)...
A. Enantiomers: Certain substances have the unique property of rotating the plane of plane-polarized light. Such...
A. Enantiomers: Certain substances have the unique property of rotating the plane of plane-polarized light. Such light rotation is detectable with the aid of a polarimeter. In order for a molecule to be optically active it must be chiral. Chiral objects lack a plane of symmetry and are non-superimposable on their mirror images. A sp?- hybridized carbon atom can fulfill these requirements if all four of its substituents are different. 1. Methane a) Prepare a methane molecule and then substitute...
4 4. (a) Draw the structure of the two chair forms of methylcyclohexane. Draw in all bonds (even the C-H bonds). Be sure the axial and equatorial bonds are shown correctly. On the appropriate structure, indicate the 1,3-diaxial interactions involving the methyl group. (b) Which is more stable, trans-1,3-dimethylcyclohexane or cis-1,3-dimethylcyclohexane? Why? 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...
Remove one hydrogen atom from C_1 the hexane model, and one H atom plus its bond from C_6. Bend the carbon chain around and join C_1 to C_6 to make cyclohexane. Mentally designate one carbon as C_1. Place the model in the chair conformation by tipping C_1 up and C_4 down. Check the conformation with the instructor. Identify the axial and equatorial hydrogens and describe their orientation relative to the plane of the ring. Look down each successive C-C bond...
9. Draw two different chair conformations of cyclohexanol, showing all hydropen atoms. Identify each position as axial or equatorial 10. Draw the most stable chair conformation of the following molecules, and estimate the amount of strain in each: (a) trans-1-Chloro-3-methylcyclohexane (b) cis-1-Ethyl-2-methylcyclohexane (c) cis-1-Bromo-4-ethylcyclohexane (d) cis-1-tert-Butylcyclohexane 11. Which isomer is more stable, cis-decalin or trans-decalin? Explain. 12. Glucose exists in two forms having a 36:64 ratio at equilibrium. Draw a skeletal structure of each, describe the difference between them and...
Page < 2 > of 5 0 8) In the most stable conformation of tert-butylcyclohexane, how many axial hydrogen atoms are present? a. O Eb. 2 e. 6 9) Which statement is true concerning the mechanism for reaction between HBr and H2C=CH2 to form bromoethane? a the reaction forms mechanism shows electron movement using full arrows, e.g. b. the reaction involves a slow, rate-determining formation of a radical intermediate c. the reaction involves homolysis d. In the first step, HBr...
TU c) Start with the model of propene built in 3a), substituting different hydrogen atoms of propene with a methyl group to form isomers of butene, CaHg. How many different isomers exist for butene (C4Hg)? Prepare models and draw the Lewis structures for each of the isomers. d) Two of isomers of butene comprise a pair of stereoisomers. Draw the skeletal structures and include IUPAC names for the cis and trans isomers. Recall in the cis isomer both methyl groups...
3. Cyclic compounds The presence of the ring in all but very large ring cyclic molecules prevents full rotation of the ring atoms. For this reason, stereoisomerism may also occur in cyclic molecules. a) Prepare a model of cyclohexane, C6H12. Draw the condensed formula. b) Build a model of methylcyclohexane (C7H14) by replacing one of the hydrogens of cyclohexane with a methyl group. Draw the skeletal formula for methylcyclohexane. 2 c) How many different isomers exist for methylcyclohexane (CyH34)? d)...
A. Enantiomers: Certain substances have the unique property of rotating the plane of plane-polarized light. Such light rotation is detectable with the aid of a polarimeter. In order for a molecule to be optically active it must be chiral. Chiral objects lack a plane of symmetry and are non-superimposable on their mirror images. A sp?- hybridized carbon atom can fulfill these requirements if all four of its substituents are different. 1. Methane a) Prepare a methane molecule and then substitute...
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