2. Which dimethylcyclohexane compounds shown below exhibit symmetry and therefore are not chiral and would not rotate plane polarized light. 1 CH3 CH CH3 CH3 2 3 CH3
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- Shown is one isomer of 2,4-dibromo-1,3,5-triethylcyclohexane. Draw both chair conformations of this compound. State which is more stable. (An ethyl group should be treated as 'larger' than a bromo group.)What chair structure corresponds to the highest energy conformation of trans-1,4-dichlorocyclohexane (shown on left)? CI CI CI CI CI CI CI .CI CI A C D CI B O O O OClassify the pairs of molecules as not the same molecule, structural isomers, diastereomers, enantiomers or identical. Circle any molecules that are not achiral (a) (b) (c) Br... H CI H H Br H H3C Br H. CI Br H Br CI I I Br" "H H Br H CH3 Cr Br
- Which of the following compounds is chiral. H3C H;C H:C CH, H;C CH CH3 CH3 BA 1,2-cis disubstituted cyclohexane, such as cis 1,2-dichlorocyclohexane, must have one group axial and one group equatorial. Explain,a) Draw the chair conformations of 1, 4 – ditertbutyl cyclohexane. b) Determine the most stable and least stable conformations. Explain your answer.
- Which of the following is the highest energy chair conformer of the most stable isomer of 1-ethyl-2,4-dimethylcyclohexane? A | B II C) III IV = || ||| > INPyrethrin II and pyrethrosin are two natural products isolated from plants of the chrysanthemum family. Pyrethrin II is a natural insecticide and is marketed as such. Q,) Label all chiral centers in each molecule and all carbon-carbon double bonds about which there is the possibility for cis,trans isomerism.Does chloromethane contain a plane of symmetry? Is it a chiral?