1. The maxmum number of stereoisomers that are possible for a given molecule can
ID: 794560 • Letter: 1
Question
1. The maxmum number of stereoisomers that are possible for a given molecule can be determined from the formula, 2n, where n is the number of stereocenters in the molecule.
a. Using this formula, what is the maximum number of stereoisomers that could exist for 1,2-diaminocyclohexane?
b. Why are there only three stereoisomers of 1,2-diaminocyclohexane rather than the number you calculated in part a?
3. Indicate the stereochemical relationship between each of the following pairs of stereoisomers of 1,2-dibromocyclohexane, and indicate whether each pair will have identical or different physical properties.
4. Neral belongs to the class of compounds known as terpenes. Terpenes are synthesized biologically by linking characteristic 5-carbon units with the structure below. How many of these units are found in neral and what type of bonding is linking these units together?
The maximum number of stereoisomer's that are possible for a given molecule can be determined from the formula, 2n, where n is the number of stereocenters in the molecule. Using this formula, what is the maximum number of stereoisomers that could exist for 1,2-diaminocyclohexane? Why are there only three stereoisomers of 1,2-diaminocyclohexane rather than the number you calculated in part a? Indicate the stereochemical relationship between each of the following pairs of stereoisomers of 1,2-dibromocyclohexane, and indicate whether each pair will have identical or different physical properties. Neral belongs to the class of compounds known as terpenes. Terpenes are synthesized biologically by linking characteristic 5-carbon units with the structure below. How many of these units are found in neral and what type of bonding is linking these units together?Explanation / Answer
a) two stereocenters ... 2^2 = 4 stereoisomers
b) Three combinations are possible (1R, 2R), (1S, 2S), (1R, 2S)
(1R, 2S) is the same as (1S, 2R) in this case since both substituents on the cyclohexane ring are the same.
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