Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its cis isomer.
Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for its trans isomer.
Decide which one of the following cycloalkanes shows cis-trans isomerism and draw a structural formula for...
Draw the structure(s) of the cycloalkanes with the chemical formula CHthat DO NOT exhibit cis-trans isomerism. The ring must contain 4 or more carbons. • Use the wedge hash bond tools to indicate stereochemistry where it exists. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right comer • Separate structures with signs from the drop down menu. -O0O- ChemDoodle
2. Draw the structures of the cis-trans isomers for each compound. Label them cis and trans. If no cis-trans isomers exist, write none. a. 2,3-dimethyl-2-pentene b. 1,1-dimethyl-2-ethylcyclopropane c. 1,2-dimethylcyclohexane d. 5-methyl-2-hexene e. 1,2,3-trimethylcyclopropane
For the molecule whose condensed structural formula is given below, decide if cis-trans isomers are possible. If they are, enter the name of the cis isomer in the first box and the name of the trans isomer in the second box. If cis-trans isomers are not possible, enter the name of the compound in the first box and leave the second box blank. Do not attempt to put cis or trans in italics. CH3CH2CH=CH2
2.37 Draw the formula for the preferred conformation of a. bromocyclohexane. c. cis-1-ethyl-3-methylcyclohexane. b. trans-1,4-dimethylcyclohexane. d. 1,1-dichlorocyclohexane.
11. Build the chair and boat conformations and identify the most stable conformation. Identify the 1,3-diaxial interactions. 12. Draw the most stable conformation of (a) ethylcyclohexane (b) 3-isopropyl-1,1-dimethylcyclohexane (c) cis-1-tert-butyl-4-isopropylcyclohexane 13. Draw all possible conformations of 1,4-dimethylcyclohexane and identify the most stable conformation 14. (a) Draw both chair conformations of cis-1,2-dimethylcyclohexane, and determine which conformer is more stable. (b) Repeat for the trans isomer. (c) Predict which isomer (cis or trans) is more stable. 15. (a) Draw both chair conformations...
4. Draw the following cycloalkanes as two-dimensional structures, using wedges and dashes: trans-1-bromo-2-methylcyclopentane cis--chloro-3 ethylcyclohexane trans-1,3-dimethylcyclohexane trans-1-bromo-3 ethylcyclobutane cis-1-ethyl-4-methylcycloheptane cis-1-isopropyl-3- methylcyclopentane
PART B: Cyclohexane Procedures: 1. Make a model of cis-1,2-dimethylcyclohexane and trans-1,2-dimethylcyclohexane. Do a ring flip of both *Draw the two conformation of the cis and trans cyclohexane structures above *List the number of axial and equatorial substituents for both the cis and trans *Which isomer is more stable overall, cis or trans? Why? 2. Make a model cis-1,3-dimethylcyclohexane and trans-1,3-dimethylcyclohexane. Do a ring flip *Draw the two conformation of the cis and trans cyclohexane structures above *List the number...
In each of the cases below, which isomer is more stable? a) 1,4-dimethylcyclohexane (cis/trans?): b) 1-bromo-2-methylcyclohexane : (cis/trans?) c) 1,3-diethylcyclohexane (cis/trans?)
Which of these alkenes exhibit cis-trans isomerism? Select all that apply. Which of the following alkenes exhibit cis-trans isomerism?
2. Which of the following compounds exhibit cis/trans Isomer CIS and transforms of the compounds that do exhibit Isomers s exhibit cis/trans isomerism? Explain why. Draw the a) Methylcyclobutane b) 3-ethyl-3-hexene c) 1-ethyl-3-methylcyclopentane d) 2,3-dimethylpentane e) 2,3-dichloro-2-hexene f) 2-butyne