21.The following questions require that you provide the structure of an organic compound, which you may writeusing “zig-zag” representations if appropriate. You are also asked to provide other information in eachquestion, so don’t forget to read the question carefully!(6)a.Write the structure of 1,3,6,6-tetramethyl-1-cyclohexene and with an asterisk (*) specify stereocenter(s), if any, thatyou can identify in it.*(6)b.Write the structure of a cyclopropane of molecular formula C6H12that is a meso isomer. Define the term, “mesoisomer.”A meso isomer is a configurational isomer having two or more stereocenters and a superimposable mirror image.orA mesoisomer is a configurational isomer having two or more stereocenters and a mirror plane of symmetry.(6)c.Write the structure of an acyclic alkene of molecular formula C6H10Br2that cannot be a diastereomer (Eor Zisomer)but contains a single stereocenter. Define the term, “diastereomers.”BrBrBrBrBrBrBrBrDiastereomers are configurational isomers that are not enantiomers.(6)d.Using wedges and slashes as needed, write a three-dimensional representation of the Renantiomer of the moleculeshown below. Be certain to specify the group priorities that you assign. Define the term, “enantiomer.”CBrCH3CHCCH2H3CCH2CHH1234CBrCH3CHCCH2H3CCH2CHHRAn enantiomer is a stereoisomer having a non-superimposable mirror image.
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