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- Draw chemical structure with appropiate stereochemistry ( cis or trans, E or Z)Name the structuresBuild a model of methylcyclohexane, and use the model to complete the following Newmanprojections of methylcyclohexane in the chair conformation: a. When the methyl group is in an axial or equatorial (circle one) position, the molecule is inits lowest potential energy conformation. b. Label one Newman projection above anti and the other gauche to describe the relationshipbetween the methyl group and C3 of the ring. c. In general, which is a lower PE conformation, anti or gauche? d. Explain how your answer to b and c provide an explanation for why it is more favorable fora large group to be in an equatorial than an axial position.Which do you expect to be the more stable conformation of cis-1,3-dimethylcyclobutane, A or B? Why?
- When you obtained a geometry optimized structure of methyleyelopentane, did you determine the energy of the most stable conformation? Why or why not?[Referenca cis-2,5-dimethyl-1,3-dioxane The structure of cis-2,5-dimethyl-1,3-dioxane is shown above, without stereochemistry. In the most stable chair conformation, predict the orientation of the two methyl group both equat 1 axial and In the sketchpad, draw the structure of cis-2,5-dimethyl-1,3-dioxane. both axial • Draw your ring as a flat hexagon with wedge/dash bonds to indicate stereochemistry. If a group is achiral, do not use wedged or hashed bonds on it. • In cases where there is more than one answer, just draw one.Consider 1-bromo-2-methylpropane and draw the following. Q) The staggered conformation(s) of highest energy
- The overall process of converting one chair conformation to another chair conformation is known as RING INVERSION or ring flipping and is a very rapid process. The cyclohexane ring inverts approximately 10 time a second at room temperature. Show this interconversion by drawing the two chair conformations and putting a reversible arrow between them to indicate a dynamic equilibrium. If we have a methylcyclohexane molecule and this undergoes ring inversion, whatwill be the resulting structure? ?Consider 1-bromo-2-methylpropane and draw the following. Q) The staggered conformation(s) of lowest energyStrain of one Strain of one 1,3-diaxial interaction 1,3-diaxial interaction Strain of one 1,3-diaxial interaction H X Ph (C6H5) CO,H CN F 0.12 Me 0.9 1.5 Cl 0.7 0.1 0.25 Et 0.95 Br 0.25 i-Pr 1.1 OH 0.5 t-Bu 2.7
- Stereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the struct a compound that is a stereoisomer of trans-1,2-dibromocyclobutane. (Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.) • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • In cases where there is more than one answer, just draw one. Hox Sn [F ? ChemDoodle(B) Draw two chair conformations of the following substituted cyclohexane and identify the most stable conformation. Clearly show the axial and equatorial bonds.5) relationship between the pairs of structures. NOTE: Each term may be used more than Choose the term from the five terms listed below that BEST describes the once and not all terms need be used. Identical Diastereomers Enantiomers Constitutional isomers Not isomers CH3 CH3 ÇI H3C-Br CH3 Br -CI H,C. D-H H3C- Br H- -D Br CH3 -CI ČH3 OH H3C, CHO OHC, OH OH H. HO CHO OHC CH3 H. OH ÓH