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Questions regarding Absolute and Relative Configurations  

Qu 1:  Bromine reacts with alkenes to give dibromides via a stereospecific reaction (see chapter 6)
Draw the dibromide products produced by the addition of Br2 to the following alkenes, 
(a) propene
(b) Z-2-butene
(c) E-2-butene
Qu 2: As you will learn later, alkynes can be reduced to alkenes in two different ways.
Using the data provided below and what you learned from Qu 1, deduce the stereochemistry of the two methods of reduction. 
A : 2-butyne + H2 + catalyst gives an alkene that reacts with Br2 to give a racemic mixture 
B : 2-butyne + Na / NH3 gives an alkene that reacts with Br2 to give a single achiral compound.

Answers.....


 
organic chemistry © Dr. Ian Hunt, Department of Chemistry University of Calgary